Laporan Projek Akhir POLITEKNIK (ELEKTRIK)

ELECTRICAL ENGINEERING DEPARTMENTDIPLOMA OF ELECTRICAL ENGINEERING

LAST PROJECT REPORT TITLE HANDPHONE CONTROLLED ROBOT Prepared by : SANIY BIN HAJI AHMAD

07DET12S1002

MUHAMMAD ABU SOFIAN BIN ABU BAKAR

07DET12S1006

RIDZUAN BIN MAKLIN

07DET12S1003

Supervised by : Mr Chin Ken Leong

Electrical Engineering Department Lecturer

NAME

LAST PROJECT REPORT DIPLOMA ELECTRICAL ENGINEERING SESI JULAI 2012

RESEARCH ABOUT HANDPHONE CONTROLLED ROBOT

REGISTER NUMBER 1.

SANIY BIN HAJI AHMAD 07DET12S1002

2.

MUHAMMAD ABU SOFIAN BIN ABU BAKAR 07DET12S1006

3.

RIDZUAN BIN MAKLIN 07DET12S1003

ELECTRICAL ENGINEERING DEPARTMENT KOTA KINABALU POLYTECHNIC

SESI JULAI 2012

RESEARCH ABOUT HANDPHONE CONTROLLED ROBOT

NAME

REGISTER NUMBER

1.

SANIY BIN HAJI AHMAD

07DET12S1002

2.

MUHAMMAD ABU SOFIAN BIN ABU BAKAR

07DET12S1006

3.

RIDZUAN BIN MAKLIN

07DET12S100

This proposal submitted to Electrical Engineering Department Of Kota Kinabalu Polytechnic as fulfil qualification to graduate in Diploma of Electrical Engineering

VERIFICATION PROJECT REPORT Project report title is Handphone Controlled Robot.

Revised

:

Supervisor Name

: Mr Chin Ken Leong

Supervisor Signature : Date

:

Certified by

:

Coordinator name

:

Coordinator signature

:

Date

:

"We attribute this work is the result of our own work except excerpts which we have explained each source." 1.

2.

3.

Signature Name Register Number Date

: : : :

Saniy Bin Haji Ahmad 07DET12S1002

Signature Name Register Number Date

: : : :

Muhammad Abu Sofian Bin Abu Bakar 07DET12S1006

Signature Name Register Number Date

: : : :

Ridzuan Bin Maklin 07DET12S1003

ACKNOWLEDGEMENTS

Alhamdulillah pray to Allah because favor and grace from Allah, finally got our complete the full report as well as on electrical engineering projects. In preparing this report, too many trials and challenges our task ahead, but had all of that we made as a lesson and experience is quite valuable because tired tired we finally pays off when the report was finally successfully completed perfectly and successfully. Gratitude of thanks to our supervisor Mr Chin Ken Leong because helped us in all respect especially when we almost lost enthusiasm because of the stalemate to figure out a proper way to solve the problem in the face. In addition, the acknowledgement to all the lecturers Kota Kinabalu Polytechnic as contribute guidance to us about this study. This speech is intended to. This speech was addressed to both our parents because a lot of support and help us financially, spirit and moral. Do not forget also to the Pitas District Education Office, Sandakan Fire Department, prison Department Kepayan and classmates and those involved directly and indirectly in helping us complete this report successfully. Wassalam.

ABSTRACT A robot is an electro-mechanical device that can perform autonomous or preprogrammed tasks. A robot may act under the direct control of a human (eg. the robotic arm of the space shuttle) or autonomously under the control of a programmed computer. Robots may be used to perform tasks that are too dangerous or difficult for humans to implement directly (e.g. nuclear waste clean up) or may be used to automate repetitive tasks that can be performed with more precision by a robot than by the employment of a human (e.g. automobile production.)

This project aims at designing a robot, which has freedom of movement along all the 3 axes and its motion is controlled by means of wheels. The user can control the movements using a Cellphone from a remote place. The system is made more useful by introducing artificial intelligence to it. By artificial intelligence, we mean designing the robot is such a manner that in situation which require decision making, the robot identifies the presence of the obstacle, alerts the user and moreover awaits instruction from the user for the further action. Other condition, which the robot can determine, is presence of fire. I.e., high temperature and presence of metals in vicinity.

Contents Chapter

Case

Page

Page Title

i

Verification Project Report

iii

Students Certificate

iv

Acknowledge

v

Abstract

vi

Contents

vii

List of Tables

viii

List of Figures

xii

List of Photos

xiii

1

INTRODUCTION 1.1

Introduction

1

1.1.1

Introduction of Robot

2

1.2

Problem Found

3

1.3

Objective

5

1.4

Scope Research

5

2

LITERATURE REVIEW 2.1

Introduction

8

2.2

MPLSB IDE

10

2.3

DTMF (Dual Tone Mode Frequency)

10

2.4

Infrared (IR) Object Detection Module

10

2.5

Bluetooth module

11

2.6

Integrated L293B

12

2.7

Microcontroller

13

3

METHODOLOGY 3.1

Introduction

19

3.1.1

Robotik and Microcontroller

3.2

Methodology Flow Chart

20

3.3

Phase 1

21

3.4

Phase 2

23

3.5

Phase 3

24

3.6

Phase 4

25

4

FINDING 4.1

42

4.2

47

4.3

51

5

DISCUSSION 5.1

54

5.2

57

5.3

58

6

CONCLUSION

6.1

60

6.2

61

REFERENCE ATTACHMENT A ATTACHMENT B ATTACHMENT C

65

LIST OF TABLES

NO TABLES

TABLES

PAGES

3.1

29

4.1

43

4.2

45

4.3

47

4.4

49

5.1

57

LIST OF FIGURES NO OF FIGURE

TITLE

PAGE

3.1

22

4.1

44

5.1

56

6.1

56

LIST OF PHOTOS No.Photo

Title

Pages 2.1

13

2.2

13

2.3

14

2.4

14

2.5

15

3.1

27

3.2

28

3.3

36

3.9

33

3.10

32

3.11

35

3.12

36

3.13

39

3.14

39

4.1

52

4.2

52

LIST OF ATTACHMENTS ATTACHMENTS

TITLE

A B C

Provided by : Saniy Bin Haji Ahmad

CHAPTER 1

INTRODUCTION

1.1

Introduction

Robotics is the branch of technology that deals with the design, construction, operation, and application of robots, as well as computer systems for their control, sensory feedback, and information processing. These technologies deal with automated machines that can take the place of humans in dangerous environments or manufacturing processes, or resemble humans in appearance, behavior, and/or cognition. Many of today's robots are inspired by nature contributing to the field of bio-inspired robotics.

Photo 1.1

:

Robot from 2 DC motor

The concept of creating machines that can operate autonomously dates back to classical times, but research into the functionality and potential uses of robots did not grow substantially until the 20th century. Throughout history, robotics has been often seen to mimic human behavior, and often manage tasks in a similar fashion. Today, robotics is a rapidly growing field, as technological advances continue, research, design, and building new robots serve various practical purposes, whether domestically, commercially, or militarily. Many robots do jobs that are hazardous to people such as defusing bombs, mines and exploring shipwrecks

1.2 1.2.1

Introduction Of Robot As strange as it might seem, there really is no standard definition for a robot. However, there are some essential characteristics that a robot must have and this might help you to decide what is and what is not a robot. It will also help you to decide what features you will need to build into a machine before it can count as a robot.

1.2.2

A robot has these essential characteristics:

1.2.2.1 Sensing First of all your robot would have to be able to sense its surroundings. It would do this in ways that are not unsimilar to the way that you sense your surroundings. Giving your robot sensors: light sensors (eyes), touch and pressure sensors (hands), chemical sensors (nose), hearing and sonar sensors (ears), and taste sensors (tongue) will give your robot awareness of its environment. 1.2.2.2 Movement A robot needs to be able to move around its environment. Whether rolling on wheels, walking on legs or propelling by thrusters a robot needs to be able to move. To count as a robot either the whole robot moves, like the Sojourner or just parts of the robot moves, like the Canada Arm. 1.2.2.3 Energy A robot needs to be able to power itself. A robot might be solar powered, electrically powered, battery powered. The way your robot gets its energy will depend on what your robot needs to do.

1.2.2.4 Intelligence A robot needs some kind of "smarts." This is where programming enters the pictures. A programmer is the person who gives the robot its 'smarts.' The robot will have to have some way to receive the program so that it knows what it is to do.

Photo1.2 : GSM controlled robot

Well it is a system that contains sensors, control systems, manipulators, power supplies and software all working together to perform a task. Designing, building, programming and testing a robots is a combination of physics, mechanical engineering, electrical engineering, structural engineering, mathematics and computing. In some cases biology, medicine, chemistry might also be involved. A study of robotics means that students are actively engaged with all of these disciplines in a deeply problem-posing problem-solving environment.

Photo 1.3 : Microcontroller

1.3 Problem found I.3.1

The application that we found in this research to communicated handphone with microcontroller PIC18F4550 is as follows:

I.3.2

First application is using Dual Tone Multiple Frequency (DTMF) – Using two mobile phones for effective transmission and reception by DTMF. The problem using this application is cannot using PIC18F4550 . It can only used PIC16F and PIC24F.

I.3.3

Second application we found is using arduino application – This application is Android controlled robot by Bluetooth. The problem using this application is cannot using microcontroller PIC18F, it just can used microcontroller from arduino and all of application at smartphone is arduino application.

I.3.4

Third application is using Bluetooth robot there was install at smart phone and controlled PIC 18F4550 by bluetooth through integrated L923B . This application give us full of data except full circuit diagram from proteus. Given just a picture of components that installed at PCB layout and has a label at all of the component. This application is very suitable but the problem is full data from Bluetooth Robot website that has been downloaded don’t give the circuit diagram from proteus. But the picture PCB layout and all of the component included and we can redraw based on picture PCB layout given with support and guide from supervisor.

1.4 Objective The objective of our project is to control the robot by mobile phone. In this project, the robot is controlled by a mobile phone that makes a call to the mobile phone attached to the robot. In the course of a call, if any button is pressed, a tone corresponding to the button pressed is heard at the other end of the call. This tone is called ‘dual-tone multiple frequency’ (DTMF) tone. The robot perceives this DTMF tone with the help of the phone stacked in the robot. The received tone is processed by the ATmega16 microcontroller with the help of DTMF decoder MT8870. The decoder decodes the DTMF tone into its equivalent binary digit and this binary number is sent to the microcontroller. The microcontroller is pre programmed to take a decision for any given input and outputs its decision to motor drivers in order to drive the motors for forward or backward motion or a turn. The mobile that makes a call to the mobile phone stacked in the robot acts as a remote. So this simple robotic project does not require the construction of receiver and transmitter units. DTMF signaling is used for telephone signaling over the line in the voice-frequency band to the call switching centre. The version of DTMF used for telephone tone dialing is known as ‘Touch-Tone’. DTMF assigns a specific frequency (consisting of two separate tones) to each key so that it can easily be identified by the electronic circuit. The signal generated by the DTMF encoder is a direct algebraic summation, in real time, of the amplitudes of two sine (cosine) waves of different frequencies, i.e., pressing ‘5’ will send a tone made by adding 1336 Hz and 770 Hz to the other end of the mobile phone. 1.5 Scope Research Scope research in this project is including all of literature review is as follows : 

Most suitabale application to communicated handphone to PIC18F4550



Input Device



Input Interface



Programming Microcontroller PIC18F4550



Output Interface



Output Device

CHAPTER 2

LITERATURE REVIEW

2.1. INTRODUCTION OF SCIENTIFIC ASPECT

Remote control vehicles have various scientific uses including hazardous environments, working in the deep ocean, and space exploration. RCV is used by police to detect bombs,or some chemicals,etc. It detects chemicals or whatever with its high-power sensors. The majority of the probes to the other planets in our solar system have been remote control vehicles, although some of the more recent ones were partially autonomous. The sophistication of these devices has fueled greater debate on the need for manned spaceflight and exploration. The Voyager I spacecraft is the first craft of any kind to leave the solar system. The martian explorers Spiritand Opportunity have provided continuous data about the surface of Mars since January 3, 2004. Jason is the Woods Hole Oceanographic Institution's deep water explorer and can withstand depths of up to 6,500 feet. The Scorpio ROV is a British submersible that rescued the crew of the Russian AS-28 on August 7, 2005.

2.1.1

Military and law enforcement Military usage of remotely controlled military vehicles dates back to the first half of 20th century. John Hays Hammond, Jr., invented and patented methods for wireless control

of

ships

starting

in

1910.

Soviet Red

Army used

remotely

controlled teletanks during 1930s in the Winter War and early stage of World War II. There were also remotely controlled cutters and experimental remotely controlled planes in the Red Army.

Remote control vehicles are used in law enforcement and military engagements for some of the same reasons. The exposure to hazards are mitigated to the person who operates the vehicle from a location of relative safety. Remote controlled vehicles are used by many police department bomb-squads to defuse or detonate explosives. See Dragon Runner,Military robot. Unmanned Aerial Vehicles (UAVs) have undergone a dramatic evolution in capability in the past decade. Early UAV's were capable of reconnaissance missions alone and then only with a limited range. Current UAV's can hover around possible targets until they are positively identified before releasing their payload of weaponry. Backpack

sized

UAV's

will

provide

ground

troops

with

over

the

horizon surveillance capabilities.

2.1.2

Recreation and hobby See Radio-controlled model. Small scale remote control vehicles have long been popular among hobbyists. These remote controlled vehicles span a wide range in terms of price and sophistication. There are many types of radio controlled vehicles. These include on-road cars, off-road trucks, boats, airplanes, and even helicopters. The "robots" now popular in television shows such as Robot Wars, are a recent extension of this hobby (these vehicles do not meet the classical definition of a robot; they are remotely controlled by a human). Radio-controlled submarine also exist. Recently, Sony Ericsson released a remote control car that could be controlled by any Bluetooth cell phone. Radio is the most popular because it does not require the vehicle to be limited by the length of the cable or in a direct line of sight with the controller (as with the infrared set-up).

2.2

FIRMWARE TOOLS

The following device programming software are sufficient and effective tools for PIC firmware implementation. These will be briefly explained in the subsections. 2.2.1

MPLAB IDE

MPLAB® IDE is a powerful firmware development tool which supports many

2.2.1.1

compiling options and debugging interfaces hence provides a flexible and structural development environment for the programmer. It can on run on Windows ® platform as a 32-bit application. The environment is simply a notepad application which is assisted by supplementary features. The tool is freely provided by Microchip ® and its final release can be downloaded from: www.microchip.com (can be found at the design section of the page). Previous versions can be found at the archive page: http://www.microchip.com/stellent/idcplg? IdcService=SS_GET_PAGE&nodeId=1406&dDoc Name=en023073 . 2.2.1.2

Here, the installation of the version 8.43 of MPLAB will be explained. The installation procedure can differ according to the final release of the tool. Therefore, consult the relevant documents before installing the final versions. I)

Download

the

MPLAB

8.43

from

the

webpage1:

http://www.microchip.com/stellent/idcplg? IdcService=SS_GET_PAGE&nodeId=1406&dDoc Name=en019469&part=SW007002 II)

Extract the .zip package to a folder

III)

If there is a previous installation of the software (older than 8.43), remove it prior to installation.

IV)

If the pages are updated, you can find the final versions (as well as the previous

releases) of the software tools presented in this document from the relevant sections of the microchip webpage or archives

V)

In the extracted folder, run setup.exe with an administrative profile and follow the recommended remarks, accept the license terms, select complete installation etc.

VI)

At this stage, MPLAB will validate your installation which will take about 10-30 minutes depending on how you follow the instructions. If you forgot to remove the previous installations, the program will first try to uninstall those configurations.

VII)

After a while, the installation program will ask you to install the HI-TECH C compiler which is the default compiler for PIC10/12/16 microcontrollers to be used within MPLAB. Select Yes to install the final version of the compiler (9.70 is the final release of this compiler for now).

Photo 2.1 : Installing MPLAB C Language VIII)

Click Next, accept the license agreement, note on the installation directory,

check the “Add the environment path” option. IX)

Restart your computer

After the installation of MPLAB IDE is complete, you can see the documentation

related to various tools and patches used in MPLAB.

Photo 2.2 : Release Notes and Installed Tools for MPLAB

2.2.1.3 If you have any problems with the installation steps, refer to the documentations of MPLAB from its webpage. From the webpage, you can also find useful links on writing codes in C with example applications documented by MPLAB communities and forums, describing the application procedures

(hardware

configurations,

compiling

options)

as

well

(http://www.microchip.com/stellent/idcplg? IdcService=SS_GET_PAGE&nodeId=1408). In this document, only the procedure

regarding

the

implementation

of

a

simple

PIC-to-PC

communication via USB is presented. You are encouraged to refer to the documentations, examples and forums of the software/hardware publishers in the implementation steps of task-specific applications (A to D conversion, PWM, Timers etc).

2.2.2

MPLAB C18 Compiler

MPLAB® C18 compiler is one of the compiling tools for programming PIC18 MCUs. It is supported by MPLAB IDE as a compiler; hence very little effort is needed by the programmer to compile the source code. There are also other C compiler tools of MPLAB for programming 16 and 32 bit PIC microcontrollers (PIC24 and PIC32). However, only the C18 compiler is considered in this tutorial as it is the primary tool for programming the most commonly used PIC18 devices in the market (PIC18F4550, PIC18F2550, PIC18F4450 etc.). The tool was known as MPLAB C18 Compiler Student Edition and was able to support code optimizations for 60 days. Lately, it was upgraded to separate final (free) releases in which the code optimizations are limited for academic use. Free versions of the C18 compiler with code optimizations for 60 days are available on the webpage (Download the standard evaluation version):

2.3 DTMF (dual tone multi frequency) 2.3.1

DTMF (dual tone multi frequency) is the signal to the phone company that you generate when you press an ordinary telephone's touch keys. In the United States and perhaps elsewhere, it's known as "Touchtone" phone (formerly a registered trademark of AT&T). DTMF has generally replaced loop disconnect ("pulse") dialling. With DTMF, each key you press on your phone generates two tones of specific frequencies. So that a voice can't imitate the tones, one tone is generated from a high-frequency group of tones and the other from a low frequency group. Here are the signals you send when you press your Touchtone phone keys:

Digit 1 2 3 4 5 6 7 8 9 0 * #

Low High frequency frequency 697 1209 Hz 697 1336 697 1477 770 1209 770 1336 770 1477 852 1209 852 1336 852 1477 941 1336 941 1209 941 1477

Table 2.1 : Touchtone phone keys 2.3.2

A number of companies make microchips that send and receive DTMF signals. The Telephony Application Program Interface (TAPI) provides a way for a program to detect DTMF digits.

2.4 Infrared (IR) Object Detection Module Circuit Using IR LED and Photodiode

Photo 2.3 : IR LED and Photodiode

2.4.1

The IR object detection module is quiet easy to make. This circuit below is a low cost / low range infrared object detection module that you can easily make at home using IR sensors. We will use a photodiode and IR LED to make a simple circuit. IR led looks like a regular LED that you usually see in Television Remote controls. I found a small kit for infrared IR sensor circuit and sharing this here. For now I have added a regular LED to glow when something is detected , you can replace it with a buzzer or something else the way you wish.

2.4.2

The Main concept is simple , the IR led keeps transmitting IR infrared rays up to some range (there is a potentiometer also in the design with the help of which you can alter the range). When some object comes in the IR infrared range, the IR waves hits the object and comes back at some angle, Photo diode detects that IR rays and hence works as a sensor.

2.4.3

Requirements

1 1 1 1 11 2.4.4

-IR PR 1k 220E 6k8 10k Circuit diagram

Photo 2.4 : IR Circuit Diagram

LED (photodiode) resistance resistance resistance potentiometer

Photo 2.5 : PCB layout

2.4.4

For now in this circuit a LED is glowing as an example , You can use it the way you wish, You can use it to run some DC motors and make a simple robot. Or the logic 1 can be used to do complex operation with interface to some microcontroller for some complex projects.

2.4 Bluetooth module 2.4.1

With the Dwengo Bluetooth module, you can communicate wireless to your projects. You can build your own cell phone controlled robot or a home automation system . The Bluetooth module is based on a class 2 HC-06 module and supports Bluetooth v2.0. Thanks to its serial interface (TTL level) the Bluetooth module is easy to use.

2.4.2

The communication bandwidth of the module can be configured for 1200, 2400, 4800, 9600, 19200, 38400, 57600 or up to 115200 baud. When active, the module uses 40 mA.

2.4.3

The Dwengo Bluetooth module has four pins: two are used for serial communication (RXD and TXD), while the other two are used as a power supply (GND and 5V):

Photo 2.6 : Bluetooth Module

2.4.4

The easiest way to connect the Bluetooth module to your Dwengo board is by using the breadboard. Connect pins GND and 5V to the - and + lines of the breadboard. The RXD and TXD pins must be connected to the RC6 and RC7 pins of the Dwengo board:

Photo. 2.7 : Connection with microcontroller

2.4.5

If you connect the Bluetooth module in this way, it is important to disconnect jumper JP1-4 such that there is no connection between the RS232 chip on the Dwengo board and the Bluetooth module!

2.4.6

After connecting the Bluetooth module to your Dwengo board, you can use the USART module built into the PIC18F4550 to communicate with your Bluetooth module. The standard configuration is 9600 baud, 8 data bits, 1 stop bit and no parity bit.

2.4.7

Whenever your Bluetooth module (and thus Dwengo board) is active it will be recognized by your computer. Therefore you need to connect linvor with your computer. The passphrase is 1234.

2.4.8

To change the properties of the Bluetooth module you can use following AT codes:

2.4.8.1 AT+PINabcd where abcd is the new passphrase 2.4.8.2 AT+BAUDx with x = 1 to 8 with which you can configure the bandwidth from 1200 baud to 115200 baud, standard configuration is BAUD4 = 9600 baud 2.4.8.3 AT+NAMExyz where xyz is a new name for the Bluetooth module.

2.5

L293B

PUSH-PULL FOUR CHANNEL DRIVERS OUTPUT CURRENT 1A PER CHANNEL PEAK OUTPUT CURRENT 2A PER CHANNEL (non repetitive) INHIBIT FACILITY HIGH NOISE IMMUNITY SEPARATE LOGIC SUPPLY OVERTEMPERATURE PROTECTION

Photo 2.8 : Integrated L293B 2.5.1

DESCRIPTION

The L293B and L293E are quad push-pull drivers capable of delivering output currents to 1A per channel. Each channel is controlled by a TTL-compatible logic input and each pair of drivers (a full bridge) is equipped with an inhibit input which turns off all four transistors. A separate supply in-put is provided for the logic so that it may be run off a lower voltage to reduce dissipation.

2.5.2

Additionally, the L293E has external connection of

2.5.2.1 PIN CONNECTION DIP16 - L293B

Figure 2.1 : Pin connection for L293B

POWERDIP (16+2+2) - L293E

Figure 2.2 : Pin connection for L293E

2.5.2.2BLOCK DIAGRAMS DIP16 - L293B

POWERDIP (16+2+2) - L293E

2.5.2.3 SCHEMATIC DIAGRAM

Figure 2.3 : Schematic diagram

(*) In the L293 these points are not externally available. They are internally connected to the ground (substrate). O Pins of L293 () Pins of L293E.

2.5.3

ABSOLUTE MAXIMUM RATINGS

Symbol Vs

Parameter Value Supply Voltage 36 Logic Supply

Unit V

V

Voltage 36 Input Voltage 7 Inhibit Voltage 7 Peak Output Current

V V V

ss Vi V inh

(non repetitive t = Iout

5ms) Total

2

A

5

W

Power

Dissipation at TgroundP

tot

pins

= 80°C

Table 2.2 : Absolute maximum ratings

2.6

Microcontroller

Microcontroller in simple term means a small computer on a single chip. Wiki Its like an artificial mind for any intelligent devices which is responsible for taking decisions. [eg your robot needs to take decision, a microcontroller would do that for us.]

Photo 2.9 : Microcontroller PIC18f4550 Microcontrollers are made through VLSI Fabrication. VLSI fabrication ? In simple words , its a process of putting together thousands of transistors into One single small chip. Hence microcontroller are used in embedded systems . Data processing can be done through these microcontrollers .Hence Embedded system can be designed through this kind of data processing capability. Typical examples would be hand-held video games and mobile phones. A small computer on a single IC containing a small processor , little memory and programmable input & output peripherals is a microcontroller.

2.6.1

Application of microcontroller

Photo 2.10 PIC18F4550 and based

If you have ever wondered what microcontrollers are doing these days then, all kinds of devices has microcontrollers in it. Microcontroller chip is must for any devices which measures,stores,controls,calculate or displays information. Automobile industry is the largest user of microcontrollers. Microcontrollers are used in consumer products too. LCD/LED display units, Keyboards,Modems, Digital camcorders,Optical players,Printers and other peripherals are devices where you can find microcontrollers inside.

2.6.2

How microcontroller is different from microprocessor ?

Photo 2.11 : Connection microcontroller

Often the term microcontrollers and microprocessor are used interchangeably. But in many ways microcontrollers differs from microprocessor. The most important would be its functionality. Other components such as memory or components is needed in order for a microprocessor to be used. The very heart of the computer is the microprocessor. But microcontroller is designed to be all of that in one. All necessary peripherals are already built into it so no other external components are needed for its application. Since all the components are already included in the microcontroller hence it makes it perfect for various applications such as robots , as we are going to use here .

2.6.3

Why microcontroller ?

Photo 2.12 : Input interface to microcontroller

Microcontroller are usually cheaper as compared to microprocessor. You cannot include a Computer everywhere when small-small decision making jobs are needed to be done in small electronic components like your mp3 player. Hence microcontroller are used , which is good enough to handle small decision making part of some basic devices. “ A small scale Computer good enough to make basic and complex jobs.”

2.6.4

Cost ?

Microcontroller are relatively cheaper than a microprocessor what you can find in a typical computer.

2.6.5

What do we need to know about microcontroller ?

Microcontroller can be programmed , and has its own programming language and compilers. Hence in our robotic applications it is going to serve as a mind which will be responsible for taking all decisions. All the informations from various sensors will be served to microcontroller and those informations will be processed according to the logic we programmed into the microcontroller. Depending upon the capability there are numerous kinds of microcontroller.

2.6.6

Importance of microcontroller

The microcontroller I used in my robot is PIC18F4550. Due to USB integration and control the robot is very portable and do not require any separate control device to operate, it is a plug and play device to any portable computer with a USB port .A complete tutorial of programming, loading, body design, motion will be provided in my portal as a material for beginners and in as easy language as possible.

2.7

UART

The UART, or Universal Asynchronous Receiver / Transmitter, is a feature of yourmicrocontroller useful for communicating serial data (text, numbers, etc.) to your PC. The device changes incoming parallel information (within the microcontroller/PC) to serial data which can be sent on a communication line.Adding UART functionality is extremely useful for robotics. With the UART, you can add an LCD,

bootloading, bluetooth

wireless, make

a

datalogger,

debug

code,

test sensors, and much more!Understanding the UART could be complicated, so we filtered out the useless information and present to you only the useful need-to-know details in an easy to understand way .

2.7.1

RS232

RS232 is the old standard and is starting to become obsolete. Few if any laptops even have RS232 ports (serial ports) today, with USB becoming the new universal standard for attaching hardware. But since the world has not yet fully swapped over, you may encounter a need to understand this standard. Back in the day circuits were noisy, lacking filters and robust algorithms, etc. Wiring was also poor, meaning signals became weaker as wiring became longer (relates to resistance of the wire). So to compensate for the signal loss, they used very high voltages. Since a serial signal is basically a square wave, where the wavelengths relate to the bit data transmitted, RS232 was standardized as +/-12V. To get both +12V and -12V, the most common method is to use the MAX232 IC(or ICL232 or ST232 - different IC's that all do the same thing), accompanied with a few capacitors and a DB9 connector. But personally, I feel wiring these up is just a pain here is a schematic if you want to do it yourself (instead of a kit):

Figure 2.3 : Schematic diagram EIA 232 2.7.2

EIA232F

Today signal transmission systems are much more robust, meaning a +/-12V signal is unnecessary. The EIA232F standard (introduced in 1997) is basically the same as the RS232 standard, but now it can accept a much more reasonable 0V to 5V signal. Almost all current computers (after 2002) utilize a serial port based on this EIA-232 standard. This is great, because no longer need the annoying MAX232 circuit.

Photo 2.13 : Component requirements

And this is the assembled image. Notice that I added some useful wire connectorsthat did not come with the kit so that I may easily connect it to the headers on my microcontroller board. Also notice how two wires are connected to power/ground, and the other two are for Tx and Rx.

2.7.3

TTL and USB

Photo 2.14 : TTL and USB ready to use. The UART takes bytes of data and transmits the individual bits in a sequential fashion. At the destination, a second UART re-assembles the bits into complete bytes. 2.7.4

Signal Adaptor Examples

Without going into the details, and without you needing to understand them, all you really need to do is just buy an adaptor. For example: TTL -> TTL to RS232 adaptor -> PC TTL -> TTL to EIA-232 adaptor -> PC TTL -> TTL to EIA-232 adaptor -> EIA-232 to USB adaptor -> PC TTL -> TTL to USB adaptor -> PC TTL -> TTL to wireless adaptor -> wireless to USB adaptor -> PC

Photo 2.15 : RS232

Photo 2.16 : USB Cable Below is us USB to wireless adaptor.It converts a USB type signal to a TTL type signal, and then my Easy Radio wireless transmitter converts it again to a method easily transmitted by air to robot:

Photo 2.17 : Connection with USB cable

And a close-up of the outputs. connected the ground, Tx, and Rx to wireless transmitter. I will talk about Tx and Rx soon:

Photo 2.18 : Connection to microcontroller Even bluetooth transceiver has the same Tx/Rx/Power/Ground wiring:

Photo 2.18 : Connection with GPS or CMU cam If have a CMUcam or GPS, again, the same connections.

2.7.5

Other Terminology (Tx and Rx)

Figure 2.4 : UART Communication Notice how Tx is connected to Rx, and Rx is connected to Tx. If connect Tx to Tx, stuff will fry and kittens will cry may want to add a resistor of say ~2kohm coming out of your UART to each pin. This connect Tx to Tx accidentally, the resistor will absorb all the bad.

Tx pin -> connector wire -> resistor -> Rx pin Baud Rate Baud is a measurement of transmission speed in asynchronous communication. The computer, any adaptors, and the UART must all agree on a single speed of information - 'bits per second'. Data bits, Parity, Stop Bits, Flow Control The short answer:. These are basically variations of the signal, each with long explanations of why would/wouldn't use them. Stick with the defaults, and make sure follow the suggested settings of adaptor. Usually will use 8 data bits, no parity, 1 stop bit, and no flow control - but not always. Note that if are using a PIC microcontroller would have to declare these settings in your code (google for sample code, etc). I will talk a little more about this in coming sections, but mostly just don't worry about it.

Bit Banging What if by rare chance your microcontroller does not have a UART (check the datasheet), or need a second UART but your microcontroller only has one? There is still another method, called bit banging. To sum it up, send signal directly to a digital input/output port and manually toggle the port to create the TTL signal. This method is fairly slow and painful, but it works . .

Asynchronous Serial Transmission As y should already know, baud rate defines bits sent per second. But baud only has meaning if the two communicating devices have a synchronized clock. For example, what if your microcontroller crystal has a slight deviation of .1 second, meaning it thinks 1 second is actually 1.1 seconds long. This could cause baud rates to break.

One solution would be to have both devices share the same clock source, but that just adds extra wires.All of this is handled automatically by the UART, but if would like to understand more, continue reading . . . Asynchronous transmission allows data to be transmitted without the sender having to send a clock signal to the receiver. Instead, the sender and receiver must agree on timing parameters in advance and special bits are added to each word which are used to synchronize the sending and receiving units.

When a word is given to the UART for Asynchronous transmissions, a bit called the "Start Bit" is added to the beginning of each word that is to be transmitted. The Start Bit is used to alert the receiver that a word of data is about to be sent, and to force the clock in the receiver into synchronization with the clock in the transmitter. These two clocks must be accurate enough to not have the frequency drift by more than 10% during the transmission of the remaining bits in the word. (This requirement was set in the days of mechanical teleprinters and is easily met by modern electronic equipment.)

When data is being transmitted, the sender does not know when the receiver has 'looked' at the value of the bit - the sender only knows when the clock says to begin transmitting the next bit of the word. When the entire data word has been sent, the transmitter may add a Parity Bit that the transmitter generates. The Parity Bit may be used by the receiver to perform simple error checking. Then at least one Stop Bit is sent by the transmitter. When the receiver has received all of the bits in the data word, it may check for the Parity Bits (both sender and receiver must agree on whether a Parity Bit is to be used), and then the receiver looks for a Stop Bit. If the Stop Bit does not appear when it is supposed to, the UART considers the entire word to be garbled and will report a Framing Error to the host processor when the data word is read. The usual cause of a Framing Error is that the sender and receiver clocks were not running at the same speed, or that the signal was interrupted. Regardless of whether the data was received correctly or not, the UART automatically discards the Start, Parity and Stop bits. If the sender and receiver are configured identically, these bits are not passed to the host. If another word is ready for transmission, the Start Bit for the new word can be sent as soon as the Stop Bit for the previous word has been sent. In short, asynchronous data is 'self synchronizing'.

3

The

Loop-Back

Test

The loop-back test is a simple way to verify that your UART is working, as well as to locate the failure point of your UART communication setup. For example, suppose you are transmitting a signal from microcontroller UART through a TTL to USB converter tor laptop and it isn't working. All it takes is one failure point for the entire system to not work. The trick is to connect the Rx to the Tx, hence the loop-back test.

For example, to verify that the UART is outputting correctly: o

connect the Rx and Tx of the UART together

o

printf the letter 'A'

o

have an if statement turn on a LED if 'A' is received If it still doesn't work, you know that code was the failure point (if not more than one failure point). Then do this again on the PC side using HyperTerminal, directly connecting Tx and Rx of your USB port. And then yet again using the TTL to USB adaptor. .

Top

waveform:

UART

Bottom waveform: UART received 0x0F

transmitted

0x0F

Adding

UART

Functions

to

AVR

To add UART functionality (or any AVR based microcontroller) need to make a few minor modifications to your code and add a small amount of extra hardware. Full

and

Half

Duplex

Full Duplex is defined by the ability of a UART to simultaneously send and receive data. Half Duplex is when a device must pause either transmitting or receiving to perform the other. A Half Duplex UART cannot send and receive data simultaneously. While most microcontroller UARTs are Full Duplex, most wireless transceivers are Half Duplex. This is due to the fact that it is difficult to send two different signals at the same time under the same frequency, resulting in data collision. If robot is wirelessly transmitting data, in effect it will not be able to receive commands during that transmission, assuming it is using a Half Duplex transmitter.

CHAPTER 3 METHODOLOGY INTRODUCTION:

ROBOTICS AND MICROCONTROLLER Robotics is very vast and broad branch in terms of technology. Robotics is an absolute implementation of artificial intelligence. There are lots of things about robotics like motors, actuators, sensors, programming, controlling and designing. Robots in today’s world are designed to enhance human capability.Here in this website I will try to cover some of the topics. There are many things that need to be considered when it comes to designing and implementation of a robot like, sensor, power management, stability and much more.

Almost all the major manufacturing,research and aerospace industries use robots for various purposes. Here in this website I will try to provide tutorials for some of the basic robotic projects that I have created till now. Robotics and microcontroller works side by

side. The decision making part of any robotics components are microprocessor or microcontroller that act as a brain for the robot.

The vision, sensor, actuator, motors, sensor,power and voltage. All these factors and components are regulated and processed by a Central processing unit or Determine Title, Objective, Scope and Microcontroller (Microprocessor). Identify problem

PHASE 1

Here Central Processing Unit does not refer to CPU of a traditional computer but the Unit which governs the activity of an artificial device. All the input from various sensory units are being sent to the CPU and then it been processed to send control Literature Review

signals to motors. That’s how robots work.

Here in this website I will try to focus on some basic concepts and simple robotic selection projects that you can makeResearch at home.implementation If you are a and beginner then probably you are at PHASE 2 type of handphone controlled robot. right place for learning basic tutorials on robotics.I will also provide some basics of

programming on microcontrollers. Finding through internet. Email to developer and open website at Bluetooth Robot application

Install MikroC Pro For Pic,Flow learn user Methodology Chart manual, draw schematic diagram by proteus and simulate/ list component requirement and equiment to developed robot .

Finding through handphone software (Playstore) – Bluetooth Robot application

Install the application Bluetooth robot to smartphone.

Data Analysis FASA 3

Programming the PIC18F4550

Install the equipment and circuit component

Test the Handphone Controlled Robot using bluetooth

Discussion & Conclusion

FASA 4

Figure : Methodology Flow Chart PHASE 1 Determine Title, Objective, Scope and Identify problem For the first step in this research, we has been guide by lecturer that have explained to us how that criteria robot require to develope. After our group discussed about the title, every body was agreed to make a research about Hanphone Controlled Robot and lectrurer as supervisor for this Last project give us support and more explanation to develope a system that we are agreed. After that, we has continued to list objective, scope and identify the problem. Literature Review Second step in this project, we have received order from our supervisor to make a research about the system that we choose to develope. Among of the research is as follows:  Input interface (hardware)  Proteus /PIC KIT/ MPLAB for assembly and C language  Microcontroller (PIC18F4550)  Output interface (Robot using two DC motor)  Handphone communicated to PIC18F4550

PHASE 2 Research Implementation During this research to find the answer and understand all of literature review we are realized the if we are using Cell Phone communicate with microcontroller by DTMF the PIC it just PIC16F and PIC 24F only could be function with DTMF. Then we are also realized if we are using Arduino we cannot used PIC18F4550 to communicate with arduino, and then , Arduino need high cost to developed the hardware even their have many applications to use Handphone Controlled Robot. After that, we try to find some application can be interaction with PIC18f4550 in smart phone. Then, we just found one application named Bluetooth Robot and the description about the application that its can commnunicate to PIC18F4550 with integrated L293B. The Bluetooth Robot application has been install to smart phone and we are tried find the full of data to developed the robot. We has tried to email to developer (Jose Garcia) and the we are found the website and there have the full of data that we need.

PHASE 3 Data Analysis After the full of data to develope Bluetooth robot has been download. We are found the software MicroC Pro for PIC C language by mikroelektronika and we just install it to open the source code in C language guiding by user manual mikroC .

After that, we continued to analysis

the circuit diagram for input and output

interface. The picture and label for all of component included in the document. Through the data given, we can draw the circuit diagram , then simulate with support and guide from our supervisor.

PHASE 4 Install the equipment and circuit component Then, simulation of circuit diagram in proteus was success, we used the list of component and equipment that required and bought at electronic shop or by

online website. After that, we can install the component and create a robot using two DC motor and programming the PIC18F4550 by MicroC Pro for PIC. Finally we can test the robot has function or not by using application in smartphone (Bluetooth Robot).

PIC18F4550 Programming and Tutorial Hardware C

PIC18F

Microcontroller Programming Tutorial Tutorial Introduction Welcome,

here

in

this

tutorial

series

we

are

going

to

learn

some

common methodologies for programming a pic18f. The tutorials here must be perfect to get you started with pic18f microcontroller. We are going to learn about the basics and various details that you need to consider while programming a pic18f microcontroller. For making life easy I have also attached relevant coding

examples with explanation with each chapter of the tutorials that I am going to show.

This

tutorial

is

compiled

for beginners with

pic18f

microcontrollers, who

wish to learn

microcontroller

coding

in

Hardware C. We are also going to see the software tools, understand Microcontroller pin diagram, Ports and its relevance, Programming and relevant data sheet of the microcontroller, and I will also explain where and what to look for in a datasheet, as it can be confusing for beginner. Please do to complain if you find the tutorial a bit lengthy, but shortcuts are never good choice. A navigation menu on the Top must be helpful for you to switch between topic and chapters. How many ways to program a Microcontroller? There are many ways or styles to code a simple microcontroller program. What is really necessary is to develop a perfect and good coding habit or methodology while you code, to avoid confusion. For doing a same logical operation there can be multiple ways in Hardware C. It will help you to optimize the coding you do. Here I am going to explain some base line methods and also some common practices that you need to follow while coding a pic18f microcontroller with suitable examples. There can be hundred of ways of writing same code; I will just try to cover some of the basic styles to get you started, from Simple to complex ways. Once you understand the basics then it must be quiet easy for you to navigate your own imagination and make the microcontroller respond according to your wish. I will try to explain each and every block with simple and easily understandable format. I would also try to avoid Complex terms whenever it is possible.

Why Pic18f Microcontroller ? Pic microcontrollers are comparatively inexpensive and easy to find, there are also other microcontrollers Like Arduino Board which are little bit costly. Unless you want to spend too much for you projects, pic programming kit would be perfect to get you started. PIC18F is easily available and very powerful and quiet capable microcontroller which can easily enable you to add some Logic and Intel to your projects. All you need is a Microcontroller, An IDE and a Microcontroller programmer Like pickit2 or JDM.

PIC18F4550 Microcontroller Programming

For our hardware C programming tutorial we are going to use a PIC18F4550 microcontroller. PIC18F4550 is a 40 pin microcontroller by microchip and it has been a favorite microcontroller in between microcontroller hobbyist. You can easily

switch over to pic18f2550 microcontroller as well, with little modification in the code. However we are going to focus on pic18f4550 microcontroller for our tutorial with hardware C. After writing and understanding microcontroller Code we are going to upload the code into the microcontroller using hardware programmer. .

Hardware C – Compiler and IDE Hardware C is similar to the general C software programming language that you compile with a BORLAND C compiler. However the compiler and Coding methods for Hardware C are going to be different. It depends upon the microcontroller. For coding a pic18f4550 you will need an IDE that supports the respective microcontroller and also a Compiler that can compile the code written on the IDE. What is IDE? Don’t confuse IDE with “Integrated Device Electronics”, Here IDE is just an abbreviation for Integrated Development Environment which is a software environment for writing codes. IDE makes life really easy for coders. Mplab IDE and C18 Compiler The IDE that we are going to use is microchips ”MPLAB IDE “and the compiler would be “ C18 compiler “ from Microchip . MPLAB IDE will help you with a Software platform where you can write your Hardware Code, ( Just like Eclipse IDE ). And the Compiler installed with MPLAB IDE will convert the Human written code into Machine language. Please note that the microcontroller can only understand the machine language (0 and 1). The code [instructions] written in the IDE is converted into “Machine code” by the compiler. After compilation the output will be generated in .hex format (A filename with .hex) [ AN Example .hex ], all we have to do is just to upload that .HEX file into the microcontroller and then the pic18f4550 is ready for action.

There are different types of compiler. Suppose if you working with a PIC30F series microcontroller then the same MPLAB IDE will require a C30 Compiler engine to Compiler your code. C30 and C18 are just the versions of compiler which is capable of Converting your code into machine language (0’s and 1’s) which a microcontroller would understand. However since we are going to use a “PIC18F“ series of microcontroller so we will use a C18 compiler. A lite version of C18 compiler and MPLAB ide is completely free to download from Microchips website. Apart form C18 Compiler, a Hi-Tech C compiler can be also used for coding a pic18f4550 series of microcontroller. Hi-Tech C makes it easy to write codes specially when I prefer to write LCD programs, HiTech C compiler is however not free if you wish to optimize the code, So we are going to Stick to C18 Compiler, lite version. You need to login into microchip account which is free to create before you can download the C18 lite version and MPLAB IDE. The mplab refered in this tutorials is version v8.60. You can download the latest Release from their website directly. CELLPHONE INTERACT WITH

DTMF TO CONTROLLED ROBOT

Radio control (often abbreviated to R/C or simply RC) is the use of radio signals to remotely control a device. The term

is used frequently to refer to the control of model vehicles from a hand-held radio transmitter. Industrial, military, and scientific research organizations make [traffic] use of radio-controlled vehicles as well. A remote control vehicle is defined as any mobile device that is controlled by a means that does not restrict its motion with an origin external to the device. This is often a radio control device, cable between control and vehicle, or an infrared controller. A remote control vehicle (Also called as RCV) differs from a robot in that the RCV is always controlled by a human and takes no positive action autonomously. One of the key technologies which underpin this field is that of remote vehicle control. It is vital that a vehicle should be capable of proceeding accurately to a target area; maneuvering within that area to fulfill its mission and returning equally accurately and safely to base.

Interface

SPYROBO

Cell phone Cell phone as a as a Methodology to prepare Handphone Controlled Robot Transmitter Receiver

3.1

The method of project operation is given below. Makes call to the mobile phone (as receiver) attached to the robot. Now after answering the call, and in the course of the call, if any button is pressed control corresponding to the button pressed is heard at the other end of the call. This tone is called dual tone multi frequency tome (DTMF) robot receives this DTMF tone with the

help

of

phone

stacked

in

the

robot.

The received tone is processed by the 16F72 microcontroller with the help of DTMF decoder MT8870 the decoder decodes the DTMF tone in to its equivalent binary digit and this binary number is send to the microcontroller, the microcontroller is preprogrammed to take a decision for any give input and outputs its decision to

motor drivers in order to drive the motors for forward or backward motion or a turn. The mobile that makes a call to the mobile phone stacked in the robot acts as a remote. So this simple robotic project does not require the construction of receiver and transmitter units. DTMF signaling is used for telephone signaling over the line in the voice frequency band to the call switching center. The version of DTMF used for telephone dialing is known as touch tone. DTMF assigns a specific frequency (consisting of two separate tones) to each key s that it can easily be identified by the electronic circuit. The signal generated by the DTMF encoder is the direct al-gebric submission, in real time of the amplitudes of two sine (cosine) waves of different frequencies, i.e. ,pressing 5 will send a tone made by adding 1336hz and 770hz to the other end of the mobile.

1.5.1 Phase I: This is the basic phase but the most time consuming phase as this phase involve the The primary step toward the search of components& ICs which will be required. For the designing of our project we require we some specific hardware and software and then interfacing the components each other to accomplish the task required by our project. Hence our mainly consist of two parts1. Hardware 2. Software 3.1.1

Hardware Requirements All of this components was bought at Cytron Technologies through the online system. The main components of the hardware section of our project are given as:



Microcontroller (PIC18F8550)



Crystal Oscillator (4 MHz)



DTMF decoder IC(MT8870)



Motor driver (H-bridges using Relay switches)



DC Motor



Optocouplers



Voltage Regulator (IC 7805)



Head-phone



Wireless Camera



TV Resistors, Capacitors



Tuner Card,Resistors,Capacitors

1.5.2

Phase II: In this phase we will try to develop the Interfacing design circuit in PCB. In PCB first we will draw the interface circuit of land rover then after some Steps of pcb designing we will fabricate the different ICs & microcontroller. A cell phone will be also connected in the circuit with interfacing with DTMF Decoder IC.A motor driver IC will interface with microcontroller& DC motors. In the below shows the block wise interfacing of different ICs & devices.

CELL PHONE

CELL PHONE

DTMF DECODER

MICROCONTROLLER

1.5.3

Phase III:

MOTOR DRIVER

This is the final phase of project aspects, in this phase we will write a program for LEFT MOTORS

RIGHT MOTORS

given the instruction to the microcontroller. a program is written in C language and converted this source program in Hex code for burn it into microcontroller. For this

1.2 Block we will use mainly twoFig. software given below.Diagram 

Compiler (Proton)



Source Code This phase also include final testing of all coding, Interface circuit functioning & performance of whole system. If any error will be generated then we will try to remove this error by the modification on the circuit.

IMPACT OF THE PROPOSED WORK IN ACADEMICS AND INDUSTRY: This project will have a huge impact on academics and industry. With the help of this project we have tried to depict the modern & global application of cell phone. Mobile phone for robotic control can overcome these limitations and provides the advantage of robust control, working range as large as the coverage area of the service provider, no interference with other controllers. This project is very useful on the Military usage of remotely controlled military vehicles .the vehicles are controlled by the cell phone then the range of control will be broad& by the use of wireless camera we can detect the position of enemies. The industry can find major application of this project in developing mobile operated products as commercial projects. As security feature is most important factor of this project so industries have scope of finding some relevant information in building up of commercial land rover. They may be used in any search operations, where men power cannot work. This project will also prove beneficial in academics. The students can learn various principles and terminologies proposed in this project which would help their cause of advancing this technology by adding their innovative ideas and thoughts.

Provided by :Muhammad Abu Sofian

CHAPTER 4

07DET12S1006

FINDING Researching and Designing 

gathering information



identifying specific details of the design which must be satisfied



identifying possible and alternative design solutions



planning and designing a appropriate structure which includes drawings Design Of Robot

Differential drive is a method of controlling a robot with only two motorized wheels. What makes this algorithm important for a robot builder is that it is also the simplest control method for a robot. The term 'differential' means that robot turning speed is

determined by the speed difference between both wheels, each on either side of your robot. For example: keep the left wheel still, and rotate the right wheel forward, and the robot will turn left.( Don't want to turn) As long as both wheels go at the same speed, the robot does not turn - only going forward or reverse.

As shown in above figure wheels are attached with chassis made up of any metal (like iron). Shaft of two DC motors (around 150 RPM or more) are directly coupled with real wheels. So as both motors rotate CW, the land rover moves forward. And as both motors rotate CCW, it will move backward. to turn it left right DC motor rotates and to turn it right left DC motor rotates. Also it will take forward-left & forwardright turn as well as backward-left & backward-right turn if required. For that, either of the motors (left or right) is rotated CW or CCW. For example if left motor rotates CW,will take forward-right turn and if it rotates CCW then backward-right turn. Similarly for right DC motor.

The differential drive algorithm is useful for light chasing robots. This locomotion is the most basic of all types, and is highly recommended for beginners. Mechanical construction, as well as the control algorithm, cannot get any simpler than this. pseudocode:

input sensor reading make decision based on sensor reading. Do one of below actions:    

to drive straight both wheels move forward at same speed to drive reverse both wheels move back at same speed to turn left the left wheel moves in reverse and the right wheel moves forward to turn right the right wheel moves in reverse and the left wheel moves forward

Well it is a system that contains sensors, control systems, manipulators, power supplies and software all working together to perform a task. Designing, building, programming and testing a robots is a combination of physics, mechanical engineering, electrical engineering, structural engineering, mathematics and computing. In some cases biology, medicine, chemistry might also be involved. Construction work can now begin, with: 

structure



gear combinations



mechanical



placing sensors



hints and tricks

The major building blocks are cell phone, DTMF decoder, micro-controller, DC motor driver circuits. Cell phone: - This is very first and the most important part of the system because due to this only the entire system is activated and works. It will receive the signals from another cell phone and gives them as input to DTMF decoder. First the system is activated by calling the SIM card number inside the phone. Afterwards it will receive DTMF code signals dialed from another cell phone and give it to DTMF decoder. DTMF decoder: - The function of this block is self understood. It will take DTMF input given by cell phone decode it and gives 4-bit digital output to micro controller. It also generates an interrupt every time when it gives digital output Micro-controller: - You can call this block as the heart of entire system because it actually performs all the controlling actions. Depending upon the code given by DTMF decoder it will move the rover forward, backward, left or right by rotating both DC motors DC Motor driver: - It receives actuating signals from micro controller in terms of high / low logic, amplifies (current) it and rotates 2 DC motors in both directions

DTMF decoder: -

As shown in figure it is made up form readily available MT8870 chip that is widely used for DTMF based application. It receives DTMF tones and generates 4-bit digital output corresponding to received DTMF signal of digits 0 - 9 and other signals (like

*, # etc) also. It receives input form cell phone to its pin no 2. It amplifies it through internal op-amp amplifier. If it receives valid DTMF tone, it will produce pulse output on StD (pin no 15). This is indicated by green LED connected as shown. The 4-bit digital output is latched on pins 11 - 14 and that is given to micro controller. The StD output is also given to interrupt pin of micro controller through transistor that will generate negative pulse every time when DTMF signal is received. This negative pulse will generate an interrupt. All the movements of robotic arm are controlled by cell phone digit switches 1 to 8. The 4 bit digital output corresponding to these switches form MT8870 are as given here

Sample Robotic

SAMPLE

INPUT (Speaker speaks) forward back right left hit stop

INPUT

OUTPUT

OUTPUT (Robot does) moves forward moves back turns right turns left hits the coin stops doing current task

The code accepts incoming commands via telnet or voice recognition, then it sends the commands out to a robot device. It is essentially an API for using a cellphone to control a robot. Highlighted functionality includes: 

Voice recognition to speak to your robot



Text-to-speech so your robot can speak back



Compass orientation to point North, East, South, West, or any degree in between



Remote control commands for forward, back, left, right, and stop



Audio recoding to use the phone's mic to record sounds



GPS to acquire the phone's location and speak the city and state



XMPP Chat to send chat commands to the robot

Diagram Using Microcontroler

PIC Microcontrollers are quickly replacing computers when it comes to programming robotic devices. These microcontrollers are small and can be programmed to carry out a number of tasks and are ideal for school and industrial projects. A simple program is written using a computer, it is then downloaded to a microcontroller

which

in

http://www.technologystudent.com

turn

can

control

a

robotic

device.

Augmented

Microcontrollers

and

Development

Boards

In a pure sense, a microcontroller is just an IC (integrated circuit, or a black chip thing with pins coming out of it). However it is very common to add additional external components, such as a voltage regulator, capacitors, LEDs, motor driver,timing crystals, rs232, etc to the basic IC. Formally, this is called an augmented microcontroller. Timing Microcontrolled

Cycles A 'cycle' is the smallest amount of time it takes for your microcontroller to do 'nothing.' For example, suppose I ran this while loop on a microcontroller: cycles=8; void delay_cycles(unsigned long int cycles) { while(cycles > 0) cycles--; }

loop:

make digital port high delay_cycles(10); make digital port low delay_cycles(10);

loop:

The Final Equation create a delay of 5 seconds.

make digital port high delay_cycles(65500) x 10; make digital port low delay_cycles(65500) x 10;

calculating: 655000 cycles/second -> 655 cycles/ms 655 cycles/ms * 1.5ms = 982.5 cycles ~= 982 cycles http://www.robot-electronics.co.uk/

So to get servo to stop moving, send a signal of 1.5ms long, or 982:

turn servo on delay_cycles(982); turn servo off

Using the same equation for 1ms and 2ms, the extremes of servo motion, we calculate some more: 655

cycles/ms

*

655 cycles/ms * 2ms = 1310 cycles

For 5 seconds delay.

and then program this: loop 50 times: delay_cycles(65535);

Next Finding Using Android

1ms

= 655

cycles

In this project 8051 and bluetooth module are communicating over uart @9600bps. Bluetooth module HC-05 is controlled via simple AT commands. This module comes in SMD package and works on 3.3v power supply. The BT module is a SPP supported profile so it can be connected easily to any controller or embedded device. In this profile the data sent and receive to module directly comes on the RX pin of microcontroller. It becomes really easy to make your device bluetooth compatible. L293D H-Bridge motor driver are used to control two DC motors. A readymade compact size chassis is used to avoid the chassis assembly comlexities . The chassis contains 2 decks the lower is used for BO motors fitting the upper is used as a battery stack. On top plate the controller board is mounted by screw fitting. -

See

more

at:

view.247#sthash.TXPtNQLw.dpuf

http://www.8051projects.net/download.php?

Provided by :Muhammad Abu Sofian

CHAPTER 5

07DET12S1006

Discussion

A mobile robot is an automatic machine that is capable of movement in any given environment.Mobile robots have the capability to move around in their environment and are not fixed to one physical location. In contrast, industrial robots usually consist of a jointed arm (multi-linked manipulator) and gripper assembly (or end effector) that is attached to a fixed surface. Mobile

robots

are

also

found

in

industry, military and

security

environments. Domestic robots are consumer products, includingentertainment robots and those that perform certain household tasks such as vacuuming or gardening. Our Robot is the branch of technology that deals with the design, construction, operation, and application of robots, as well as computer systems for their control, sensory feedback, and information processing. These technologies deal with automated machines that can take the place of humans in dangerous environments or manufacturing processes, or resemble humans in appearance, behavior, and/or cognition. Many of today's robots are inspired by nature contributing to the field of bio-inspired robotics. Electric motors The majority of robots use electric motors, often brushed and brushless DC motors in portable robots, or AC motors in industrial robots and CNC machines. These motors are often preferred in systems with lighter loads, and where the predominant form of motion is rotational.

Sensing Sensors allow robots to receive information about a certain measurement of the environment, or internal components. This is essential for robots to perform their tasks, and act upon any changes in the environment to calculate the appropriate response. They are used for various forms of measurements, to give the robots warnings about safety or malfunctions, and to provide real time information of the task it is performing. Speech recognition Interpreting the continuous flow of sounds coming from a human, in real time, is a difficult task for a computer, mostly because of the great variability ofspeechThe same word, spoken by the same person may sound different depending on local acoustics, volume, the previous word, whether or not the speaker has a cold, etc.. It becomes even harder when the speaker has a different accent.

Mobile manipulator is nowadays a widespread term to refer to robot systems built from a robotic manipulator arm mounted on a mobile platform. Such systems combine the advantages of mobile platforms and robotic manipulator arms and reduce their drawbacks. For instance, the mobile platform extends the workspace of the arm, whereas an arm offers several operational functionalities. A mobile manipulation system offers a dual advantage of mobility offered by a mobile platform and dexterity offered by the manipulator. The mobile platform offers unlimited workspace to the manipulator. The extra degrees of freedom of the mobile platform also provide user with more choices. However the operation of such a system is challenging because of the many degrees of freedom and the unstructured environment that it performs in. Control The mechanical structure of a robot must be controlled to perform tasks. The control of a robot involves three distinct phases – perception, processing, and action (robotic paradigms). Sensors give information about the environment or the robot itself (e.g. the position of its joints or its end effector). This information is then processed to

calculate the appropriate signals to the actuators (motors) which move the mechanical. The processing phase can range in complexity. At a reactive level, it may translate raw sensor information directly into actuator commands. Sensor fusion may first be used to estimate parameters of interest (e.g. the position of the robot's gripper) from noisy sensor data. An immediate task (such as moving the gripper in a certain direction) is inferred from these estimates. Techniques from control theory convert the task into commands that drive the actuators. At longer time scales or with more sophisticated tasks, the robot may need to build and reason with a "cognitive" model. Cognitive models try to represent the robot, the world, and how they interact. Pattern recognition and computer vision can be used to track objects.Mapping techniques can be used to build maps of the world. Finally, motion planning and other artificial intelligence techniques may be used to figure out how to act. For example, a planner may figure out how to achieve a task without hitting obstacles, falling over, etc. Manual remote A manually tele operated robot is totally under control of a driver with handphone or other control device. The device may be plugged directly into the robot, may be a wireless joystick, or may be an accessory to a wireless computer or other controller. A tele-op'd robot is typically used to keep the operator out of harm's way. Segregation of duties Muhammad Abu Sofian

Find a variety of information to produce the robot by using software. Make sure components that can be utilized into Pic18f.

Saniy Bin Hj. Ahmad

Find information and circuit design and make a survey on the circuit connection for assembling circuits, and motors to function PIC18f

Ridzuan bin Maklin

Find information and circuit design and make a survey in connection to the sensor circuitry to ensure that the robot has a security aspect

Provided by :Muhammad Abu Sofian

CHAPTER 6

07DET12S1006

Conclusion Human-robot interaction If robots are to work effectively in homes and other non-industrial environments, the way they are instructed to perform their jobs, and especially how they will be told to stop will be of critical importance. The people who interact with them may have little or no training in robotics, and so any interface will need to be extremely intuitive. Science fiction authors also typically assume that robots will eventually be capable of communicating with humans through speech, gestures, and facial expressions, rather than a command-line interface. Technological trends Various techniques have emerged to develop the science of robotics and robots. One method is evolutionary robotics, in which a number of differing robots are submitted to tests. Those which perform best are used as a model to create a subsequent "generation" of robots. Another method is developmental robotics, which tracks changes and development within a single robot in the areas of problem-solving and other functions.

Autonomously guided robot An autonomously guided robot knows at least some information about where it is and how to reach various goals and or waypoints along the way. "Localization" or knowledge of its current location, is calculated by one or more means, using sensors such motor encoders, vision, Stereopsis, lasers and global positioning systems. Positioning systems often use triangulation, relative position and/or Monte-Carlo/Markov localization to determine the location and orientation of the platform, from which it can plan a path to its next waypoint or goal. It can gather sensor readings that are time- and location-stamped, so that a hospital, for instance, can know exactly when and where radiation levels exceeded permissible levels. Such robots are often part of the wireless enterprise network, interfaced with other sensing and control systems in the building.