PIC Wireless Weather Station
PIC Wireless Weather Station By: Eoghan O’Sullivan Department of Electronic Engineering, Cork Institute of Technology, Bishopstown, Cork. Supervisor: Dr. Oliver Gough Date: 30/5/2009
Eoghan O’Sullivan
ELX3
Page 1
PIC Wireless Weather Station
Abstract The main purpose of this project was to design d esign and build a wireless weather station that logged the humidity and temperature values on a remote PC. The PIC was the fundamental point in the project as it held the code that helped extract the information from the sensor and send it wirelessly using the Zigbee protocol to a remote PC.
Eoghan O’Sullivan
ELX3
Page ii
PIC Wireless Weather Station
Acknowledgement Firstly I would like to thank my project supervisor Dr. Oliver Gough for his guidance and assistance which were a great benefit to the project overall. Most of the work carried out for the project was done so in the senior lab and I would like to thank the technicians in the lab for their assistance and providing me with anything I needed. I would also like to thank my m y classmates who were a great help to me during the year and offered their help when they could. Lastly I would like to thank my family and friends for their continued support throughout the year.
Eoghan O’Sullivan
ELX3
Page iii
PIC Wireless Weather Station
Table of Contents ABSTRACT
II
ACKNOWLEDGEMENT
III
TABLE OF CONTENTS
IV
1: INTRODUCTION
5
OBJECTIVE:
5
2: COMPONENTS
7
APPENDIX 1: MINUTES OF MEETINGS
22
APPENDIX 2: PIC CODE
27
APPENDIX 3: REQUIREMENT SPECIFICATION
41
APPENDIX 4: PROJECT PLAN
48
Eoghan O’Sullivan
ELX3
Page iv
PIC Wireless Weather Station
1: Introduction The reason for choosing this project was out of o f the other twenty projects that were shown to us at the beginning of the year, this project appealed to me. It is interesting to monitor the weather conditions outside and have the data sent to a PC using wireless technology and graphing the data to see the changing conditions. This device will be placed in an outdoor environment to monitor the weather conditions. It will read in data from a sensor and then the n send it wirelessly to a receiver which will then log the data into the PC. This process will happen once a min and give an accurate picture of the conditions outside. Below is a block diagram of the overall system.
Temperature Sensor Humidity Sensor
Display
PIC Microcontroller Radio Transmitter
Receiver
Fig 1.1
Objective: My initial objectives are as follows,
Setup wireless link between PC and data logger Test Interface the sensor to the TX module Display results on PC using VB language
The monitoring of temperature and humidity in indu stry as it is very important to keep these under controlled as best as possible. Humidity is the concentration of water in the Eoghan O’Sullivan
ELX3
Page 5
PIC Wireless Weather Station air and the relative humidity is ratio that compares the amount of water vapour in the air compared to the amount of water vapour that would be present in the air at saturation. The relativity humidity is described in percentage, if there was 1 0 grams of water vapour in each kilogram of air and the saturation of the air was 50 grams of water vapour per kilogram then the relative humidity would then be 50/10 = 25%. The device used to measure humidity is called a hydrometer, it works by measuring the moisture content in the air at a given time.
Eoghan O’Sullivan
ELX3
Page 6
PIC Wireless Weather Station
2: Components Humidity & Temperature Sensor
Fig 2.1
This is the Sensirion SHT-75 humidity and temperature sensor. This sensor was the best fit for the job as it was small, easy to use and did both measurements. The humidity sensor is capacitive type which has a distinct advantage over it resistive type sensors which don’t work at relative humidity levels below 20% and they also can only be used in a non-condensing type environment. This sensor also comprises of a calibrated digital output which was a factor in choosing it as it avoided A/D conversion in the PIC. The sensor contains a 14bit analog to digital converter and a serial interface circuit on the same chip. This results in superior signal quality, a fast response time and in sensitivity to external disturbances. The 2-wire serial interface and internal voltage re gulation allows for easy and fast system integration. The small size and low power consumption makes this sensor the ideal choice.
Fig 2.2
This is how the sensor is wired up to the PIC, there are two wire on the sensor which each have a specific job.
Pin 1 – This is the serial clock input(SCK), this is used to synchronize communication between the PIC and the sensor, since the interface consists of fully static logic there is no minimum clock frequency, this was useful to the project because a bit could then be toggled in the PIC to generate a manual clock pulse. Pin 4 – This is the data line from the sensor to the PIC, it is bi-directional. DATA is valid on the rising edge of the SCK pulse and after the falling edge of the SCK pulse the DATA may then be changed, DATA must remain stable while SCK is
Eoghan O’Sullivan
ELX3
Page 7
PIC Wireless Weather Station high. To avoid signal contention the microcontroller must only drive DATA low. An external pull-up resistor (e.g. 10 k Ω) is required to pull the signal high. The senor requires a voltage in the range of 2.4V to 5.5V, the VDD and GND are decoupled by a 100nF capacitor that is built into the sensor.
Communication with Sensor Once the VDD voltage has been supplied to the sensor it needs 11ms to reach sleep state, no commands must be sent to the sensor before this time. To initiate a transmission, a Transmission Start sequence has to be issued. It consists of a lowering of the DATA line while SCK is high, followed by a low pulse on SCK and raising DATA again while SCK is still high.
Fig 2.3
The subsequent command consists of three address bits (only ‘000’ is currently supported) and five command bits. The SHT71 indicates the proper reception of a th
command by pulling the DATA pin low (ACK bit) after the falling edge of the 8 SCK th
clock. The DATA line is released (and goes high) after the falling edge of the 9 SCK clock.
Measurement Sequence After the transmission start sequence the next step is to tell the sensor what measurement is required, this is done by sending a code from the PIC to the sensor through the DATA line, if the relative humidity is required then the code ‘00000101’ is used, for temperature measurement the code ‘00000011’ is used. The PIC then has to wait while the measurement is been taken and these times which takes approximately 11/55/210 ms for a 8/12/14bit measurement. To signal the completion of a measurement, the SHT-75 pulls data line low and enters Idle Mode. The controller must wait for this Data Ready signal before restarting SCK to readout the data. Measurement data is stored until readout, therefore the controller can continue with other tasks and readout at its convenience. Shown here is the measurement sequence, the first diagram shows the measurement type being selected, this is followed by the sensor sending dat a back to the PIC, the PIC sends
Eoghan O’Sullivan
ELX3
Page 8
PIC Wireless Weather Station an acknowledgement pulse to the sensor after each byte of data that has been received, it does this by pulling the DATA line low. For this project CRC(check sum calculation) was not used as it was not necessary.
Fig 2.4
Fig 2.5
Reset Sequence If it is the case that the connection is lost between the PIC and the sensor there is a reset sequence which in turn resets the serial interface, this is achieved by leaving the DATA line high and toggling the SCK nine times or more, this must be directly followed b y a transmission start sequence.
Fig 2.6
Piczee Rx & Tx
Fig 2.7
Eoghan O’Sullivan
ELX3
Page 9
PIC Wireless Weather Station
This is a PIC Microcontroller with 2,4GHz IEEE 802.15.4 transceiver and ZigBee stack. It’s range is 100meters and it has its own built in antenna. Like all PIC chips it operates between 2.1V and 3.6V. This next diagram is a list of the pin i/o on the chip and below that is the schematic diagram of the circuit.
Eoghan O’Sullivan
ELX3
Page 10
PIC Wireless Weather Station
Fig 2.8
ZigBee’s primary aim is to make low data rate, battery power communications feasible. Primarily it does this by using mesh networks of adjacent devic es rather than point-topoint communications over long distances. It does this by setting one of the chips as coordinator and the other as an end point, this allows one chip to control the other which makes the system more efficient. Below are the most co mmon types of networks used.
Fig 2.9
For this project there are only two transceivers need ed so the star network was choosen.
Eoghan O’Sullivan
ELX3
Page 11
PIC Wireless Weather Station
For the transceivers to work correctly a protocol stack was needed. The application source code must include the header file, zAPL.h , to access the ZigBee protocol functions. #include “zAPL.h”
A ZigBee protocol coordinator application will need to have one support variable to keep track of the current primitive being executed by the Stack. ZIGBEE_PRIMITIVE currentPrimitive; A ZigBee protocol router or end device will also need to keep track of the current primitive; but in addition, it will need two other support variables to assist in network discovery and joining. NETWORK_DESCRIPTOR * currentNetworkDescriptor; ZIGBEE_PRIMITIVE currentPrimitive; NETWORK_DESCRIPTOR * NetworkDescriptor; Next, the application must configure all pins required to interface with the transceiver. Before the Stack can be used, it must be initialized. Interrupts must then be enabled. ZigBeeInit(); RCONbits.IPEN = 1; INTCONbits.GIEH = 1;
Here is an example of the basic structure of the application. while (1) { CLRWDT(); ZigBeeTasks( ¤tPrimitive ); switch (currentPrimitive) { // Include cases for each required primitive. // Be sure to update currentPrimitive! default: currentPrimitive = NO_PRIMITIVE; break; } }
To receive messages the Stack notifies the application of received messages through the APSDE_DATA_indication primitive. When this primitive is returned, the APSDE_DATA_indication primitive parameters are populated with information about the message and the received message resides in a buffer. The function, APLGet(), is used to extract each byte of the message from the buffer. Here is an example of how to receive messages using the protocol.
Eoghan O’Sullivan
ELX3
Page 12
PIC Wireless Weather Station
case APSDE_DATA_indication: { // Declare variables used by this primitive. currentPrimitive = NO_PRIMITIVE; // This may change during processing. frameHeader = APLGet(); switch (params.APSDE_DATA_indication.DstEndpoint) { case EP_ZDO: // Handle all ZDO responses to requests we sent. break; // Include cases for all application endpoints. } APLDiscard(); } break;
The Microchip Stack for the ZigBee protocol allows one outgoing message in the application layer at a time. Messages are sent b y implementing the following: Verify that the application layer is ready for a new outgoing message by confirming that ZigBeeReady() is TRUE. Lock the system with ZigBeeBlockTx() so subsequent calls to ZigBe eReady() will return FALSE. Load the message payload into the array TxBuffer, using TxData to index through the array. When complete, TxData must point to the first location after the message. Load the APSDE_DATA_request primitive parameters. Set currentPrimitive to APSDE_DATA_request and call ZigBeeTasks(). Here is an example of how to send an outgoing message. if (ZigBeeReady()) { if (bLightSwitchToggled) { bLightSwitchToggled = FALSE; ZigBeeBlockTx(); TxBuffer[TxData++] = APL_FRAME_TYPE_KVP | 1; // KVP, 1 transaction TxBuffer[TxData++] = APLGetTransId();
Eoghan O’Sullivan
ELX3
Page 13
PIC Wireless Weather Station TxBuffer[TxData++] = APL_FRAME_COMMAND_SET | (APL_FRAME_DATA_TYPE_UINT8> 8) & 0xFF; // Attribute ID MSB TxBuffer[TxData++] = LIGHT_TOGGLE; params.APSDE_DATA_request.DstAddrMode = APS_ADDRESS_16_BIT; params.APSDE_DATA_request.DstEndpoint = destinationEndpoint; params.APSDE_DATA_request.DstAddress.ShortAddr = destinationAddress; params.APSDE_DATA_request.ProfileId.Val = MY_PROFILE_ID; params.APSDE_DATA_request.RadiusCounter = DEFAULT_RADIUS; params.APSDE_DATA_request.DiscoverRoute = ROUTE_DISCOVERY_ENABLE; params.APSDE_DATA_request.TxOptions.Val = 0; params.APSDE_DATA_request.SrcEndpoint = EP_SWITCH; params.APSDE_DATA_request.ClusterId = OnOffSRC_CLUSTER; currentPrimitive = APSDE_DATA_request; } }
PIC 16F877A This is the microcontroller that was used in the project, this microcontroller can be programmed using MPLAB to carry out the tasks required.
Fig 2.10
Eoghan O’Sullivan
ELX3
Page 14
PIC Wireless Weather Station
Fig 2.11
Maxim 232
Fig 2.12
Eoghan O’Sullivan
ELX3
Page 15
PIC Wireless Weather Station
This is the Maxim 232 driver and receiver chip, this chip is used to send data from the PIC chip through an RS232 cable into the remote PC. The transmitter uses pins 12 and 13 to send data out through the RS232 port and this converts voltage into high and low pulses for a computer to recognize. Pins 11 and 14 are used by the receiver part of the chip, this takes data coming from the RS232 cable and converts the high and low pulses into a voltage.
Fig 2.13
Eoghan O’Sullivan
ELX3
Page 16
PIC Wireless Weather Station
3: Procedure & Results Firstly the Tx and Rx boards were built using vero board to mount on the components. The code was put together to read the data from the sensor using MPlab to write and debug the code. To test the code first a simplier circuit was made, it consisted of the PICdem board with the sensor directly wired into the ports on the PIC.
Fig 3.1
An incircuit debugger was used to program the chip on the PICdem board which was the 16F877a. Once the chip was programmed then using an oscilloscope the results could be tracked to verify that the sensor was working correctly.
Fig 3.2
Unfortunitily the system didn’t work out as the Data line was not being pulled to ground. Due to this the information could not be extracted from the sensor correctly because the Data line needs to go low and not idle between 1 and 0. A reason for this error was due to a faulty sensor, the Data pin on the sensor had been broken off the sensor during set up, this may have caused a bad connection which lead to the Data line not going to 0. This
Eoghan O’Sullivan
ELX3
Page 17
PIC Wireless Weather Station was a major setback, had the sensor worked perfectly it would have been possible to exact the data fom the sensor and take an accurate reading from it.
Eoghan O’Sullivan
ELX3
Page 18
PIC Wireless Weather Station
4: Problems Many obstacles were encountered during the second semester which backlogged the project significantly. Firstly due to bad planning on my part I didn’t get my objectives completled on the time schedual that I had set out at the start of the project. Secondly the sensor failed to work correctly which hampered any chance of reading in data correctly from the sensor. Thirdly the Zigbee protocol was very difficult to understand at the beginning, it took up a large sum of time researching this area which I now have an understanding of, but due to the lack of time near the end of the semister this part of the project was never completed fully
Eoghan O’Sullivan
ELX3
Page 19
PIC Wireless Weather Station
5 : Conclusion This project has been a great learning experience for me, altought I didn’t get the system working like I had hoped at the beginning of the year I still have gained a vast amount of knowledge and a better insight into projects. They seem easy to look at but this project is a challenging task which requires you to put a lot of time, effort and pre-thought in. I underestimated the work involved and didn’t start on time but like all humans we learn from our mistakes in a positive way. From this project I will take with me an understanding of work involved in projects in the future and I hope this experience will stand to me again and again.
Also my skills using MPlab have increased; I started out at the beginning of the semester with very little knowledge of how to use it correctly but with help from my supervisor, classmates and John O’Sullivan I feel like I have learnt a huge amount about it.
Eoghan O’Sullivan
ELX3
Page 20
PIC Wireless Weather Station
6: References
www.howstuffworks.com www.google.com www.farnell.com www.microchip.com www.sensirion.com W2003svr wireless humidity and temperature system 2005
Eoghan O’Sullivan
ELX3
Page 21
Wireless Weather Station
Appendix 1: Minutes of Meetings Wireless Weather Station Date 3/10/2008 Time 11:00am location PF 46
Minutes
Dr. Oliver Gough and Eoghan O’Sullivan
ATTENDEES
genda topics DISCUSSION
Sensors
CONCLUSIONS
Research
ACTION ITEMS
PERSON RESPONSIBLE
What types are out there, how much they cost and how Eoghan they could be Integrated into the project. DISCUSSION
PIC and Zigbee
CONCLUSIONS
Research
ACTION ITEMS
PERSON RESPONSIBLE
Research Microchip website, look up protocol stack, in Eoghan circuit debugger DISCUSSION
DEADLINE
Report due for Next meeting
DEADLINE
n\a
Frame a project objective
ACTION ITEMS
PERSON RESPONSIBLE
Outline the timescale on a Gantt chart
Eoghan
DEADLINE
7/11/2008
SIGNED
ELX3 Eoghan O’Sullivan
[email protected]
Page 22
Project Title
Wireless Weather Station Date 10/10/2008
Minutes
Time 11:00am location PF 46
Dr. Oliver Gough and Eoghan O’Sullivan
ATTENDEES
genda topics DISCUSSION
Minutes of last meeting
CONCLUSIONS
Need to do further research on sensors
ACTION ITEMS
PERSON RESPONSIBLE
Narrowed down to a couple of sensors, pick the most suitable
Eoghan
One for the project DISCUSSION
PIC and Zigbee
CONCLUSIONS
Research
ACTION ITEMS
PERSON RESPONSIBLE
Find out how to communicate with the PIC
Eoghan
SIGNED
DEADLINE
Report due for Next meeting
DEADLINE
n\a
Dr. Oliver Gough
Wireless Weather Station Time 11:00am location PF 46 ELX3 Eoghan O’Sullivan
[email protected]
Project Title
Dr. Oliver Gough and Eoghan O’Sullivan
genda topics Minutes of last meeting Confirmed sensors ACTION ITEMS
PERSON RESPONSIBLE
Eoghan will order the Sensirion SHT-75 humidity and temperature
Eoghan
sensor from ie.farnell.com
DEADLINE
Need this for February 2009
PICZee chip Located one for the projected ACTION ITEMS
PERSON RESPONSIBLE
Oliver had two chips which I could use on the project
n/a
DEADLINE
n\a
Dr. Oliver Gough
Wireless Weather Station Date 14/11/2008
Minutes
ATTENDEES
Time 11:10am location PF 46
Dr. Oliver Gough and Eoghan O’Sullivan
ELX3 Eoghan O’Sullivan
[email protected]
Project Title
genda topics DISCUSSION
Minutes of last meeting
CONCLUSIONS
Sensor has arrived
ACTION ITEMS
PERSON RESPONSIBLE
DEADLINE
Talked more about integrating the sensor into the project using the PIC
n/a
n/a
ACTION ITEMS
PERSON RESPONSIBLE
DEADLINE
Changes to be made to the toll gates, milestones and Gantt chart
Eoghan
and how the and the need for software DISCUSSION
Project Plan
CONCLUSIONS
Needs to be edited
18/11/2008
Dr. Oliver Gough
SIGNED
Wireless Weather Station Date 28/11/2008
Minutes
Time 11:10am location PF 46
Dr. Oliver Gough and Eoghan O’Sullivan
ATTENDEES
genda topics DISCUSSION
Minutes of last meeting
CONCLUSIONS
Download PIC 18f462 datasheet
ACTION ITEMS
Look at the datasheet and read up on the different ELX3 Eoghan O’Sullivan
PERSON RESPONSIBLE
Eoghan
DEADLINE
February
[email protected]
Project Title functions of the
2009
PIC chip and how to send and receive data. DISCUSSION
Background research
CONCLUSIONS
n/a
ACTION ITEMS
PERSON RESPONSIBLE
Send it to Olive to be reviewed
Eoghan
SIGNED
DEADLINE
28/11/2008
Dr. Oliver Gough
ELX3 Eoghan O’Sullivan
[email protected]
Project Title
Appendix 2: PIC Code list include
p=16f877A
DelayCount1 DelayCount2 Temp Temp1 Temp2 Temp3 Temp4 Temp5 Temp6 Temp7 Temp8 Temp9
equ 0x20 equ 0x21 equ 0x22 equ 0x23 equ 0x24 equ 0x25 equ 0x26 equ 0x27 equ 0x28 equ 0x29 equ 0x30 equ 0x31
org 0x00 goto start org 0x04 goto ISR org 0x10
start:
clrf PORTB bsf STATUS,RP0 clrf TRISB bcf STATUS,RP0 clrf TXREG call TXsetup clrf Temp clrf Temp1 clrf Temp2 clrf Temp3 clrf Temp4 clrf Temp8 clrf Temp9 bsf PORTB,0 ;CLK high (start up, while data is high toggle bsf PORTB,1 ;DATA high (clk 9 or more times,reset) call softdelay bcf PORTB,0 ;CLK low bsf PORTB,1 ;DATA high call softdelay bsf PORTB,0 ;CLK high bsf PORTB,1 ;DATA high call softdelay bcf PORTB,0 ;CLK low bsf PORTB,1 ;DATA high
ELX3 Eoghan O’Sullivan
[email protected]
Project Title call softdelay bsf PORTB,0 ;CLK high bsf PORTB,1 ;DATA high call softdelay bcf PORTB,0 ;CLK low bsf PORTB,1 ;DATA high call softdelay bsf PORTB,0 ;CLK high bsf PORTB,1 ;DATA high call softdelay bcf PORTB,0 ;CLK low bsf PORTB,1 ;DATA high call softdelay bsf PORTB,0 ;CLK high bsf PORTB,1 ;DATA high call softdelay bcf PORTB,0 ;CLK low ******9th time bsf PORTB,1 ;DATA high call softdelay bcf PORTB,1 ;DATA low, before clock change****** bsf PORTB,0 ;CLK high, now clock changes call softdelay bsf PORTB,0 ;CLK high ;transmission start bsf PORTB,1 ;DATA high call softdelay bsf PORTB,0 ;CLK high bcf PORTB,1 ;DATA low call softdelay bcf PORTB,0 ;CLK low bcf PORTB,1 ;DATA low call softdelay bsf PORTB,0 ;CLK high bcf PORTB,1 ;DATA low call softdelay bsf PORTB,0 ;CLK high bsf PORTB,1 ;DATA high call softdelay bcf PORTB,0 ;CLK low bsf PORTB,1 ;DATA high call softdelay bcf PORTB,1 ;DATA low, before clock change****** bsf PORTB,0 ;CLK high, now clock changes call softdelay bcf PORTB,0 ;CLK low bcf PORTB,1 ;DATA low call softdelay bsf PORTB,0 ;CLK high bcf PORTB,1 ;DATA low call softdelay bcf PORTB,0 ;CLK low bcf PORTB,1 ;DATA low
ELX3 Eoghan O’Sullivan
[email protected]
Project Title call softdelay bsf PORTB,0 ;CLK high bcf PORTB,1 ;DATA low call softdelay bcf PORTB,0 ;CLK low bcf PORTB,1 ;DATA low call softdelay bsf PORTB,0 ;CLK high bcf PORTB,1 ;DATA low call softdelay bcf PORTB,0 ;CLK low bcf PORTB,1 ;DATA low call softdelay bsf PORTB,0 ;CLK high bcf PORTB,1 ;DATA low call softdelay bcf PORTB,0 ;CLK low bsf PORTB,1 ;DATA high humidity '000001..' call softdelay bsf PORTB,0 ;CLK high bsf PORTB,1 ;DATA high call softdelay bcf PORTB,0 ;CLK low bcf PORTB,1 ;DATA low humidity '0000010.' call softdelay bsf PORTB,0 ;CLK high bcf PORTB,1 ;DATA low call softdelay bcf PORTB,0 ;CLK low bsf PORTB,1 ;DATA high humidity '00000101' call softdelay bsf PORTB,0 ;CLK high bsf PORTB,1 ;DATA high call softdelay bsf STATUS,RP0 ;PORTB set for input movlw 0x02 ;******************* movwf TRISB ;******************* bcf STATUS,RP0 ;******************* bcf PORTB,0 ;CLK low call softdelay bsf PORTB,0 ;CLK high call softdelay bcf PORTB,0 ;CLK low call softdelay bcf PORTB,0 ;CLK low \\\\changed here 4clock off//// call softdelay bcf PORTB,0 ;CLK low call softdelay bcf PORTB,0 ;CLK low call softdelay bcf PORTB,0 ;CLK low call softdelay
ELX3 Eoghan O’Sullivan
[email protected]
Project Title bcf PORTB,0 ;CLK low call softdelay bcf PORTB,0 ;CLK low call softdelay bcf PORTB,0 ;CLK low call softdelay bcf PORTB,0 ;CLK low \\\\\\\\resume clock///////// call softdelay movlw 0x08 movwf Temp3 clrw bsf PORTB,0 ;CLK high call Loop call softdelay bcf PORTB,0 ;CLK low call softdelay bsf PORTB,0 ;CLK call Loop call softdelay bcf PORTB,0 ;CLK low call softdelay bsf PORTB,0 ;CLK high call Loop call softdelay bcf PORTB,0 ;CLK low call softdelay bsf PORTB,0 ;CLK high call Loop call softdelay bcf PORTB,0 ;CLK low call softdelay bsf PORTB,0 ;CLK high call Loop call softdelay bcf PORTB,0 ;CLK low call softdelay bsf PORTB,0 ;CLK high call Loop call softdelay bcf PORTB,0 ;CLK low call softdelay bsf PORTB,0 ;CLK high call Loop call softdelay bcf PORTB,0 ;CLK low call softdelay bsf PORTB,0 ;CLK high call Loop call softdelay bcf PORTB,0 ;CLK low clrf PORTB ;****************** bsf STATUS,RP0 ; SET PORTB
ELX3 Eoghan O’Sullivan
[email protected]
Project Title clrf TRISB ; FOR OUTPUT bcf STATUS,RP0 ;***************** call softdelay bcf PORTB,1 ;pull data line low for acknowledge bsf PORTB,0 ;CLK high*** acknowledge pulse (9th) call softdelay bcf PORTB,0 ;CLK low bsf STATUS,RP0 ;******************* movlw 0x02 ; SET PORTB movwf TRISB ; FOR INPUT bcf STATUS,RP0 ;******************* clrf Temp clrf Temp1 clrf Temp3 movlw 0x08 movwf Temp3 call softdelay bsf PORTB,0 ;CLK high call Loop2 call softdelay bcf PORTB,0 ;CLK low call softdelay bsf PORTB,0 ;CLK high call Loop2 call softdelay bcf PORTB,0 ;CLK low call softdelay bsf PORTB,0 ;CLK high call Loop2 call softdelay bcf PORTB,0 ;CLK low call softdelay bsf PORTB,0 ;CLK high call Loop2 call softdelay bcf PORTB,0 ;CLK low call softdelay bsf PORTB,0 ;CLK high call Loop2 call softdelay bcf PORTB,0 ;CLK low call softdelay bsf PORTB,0 ;CLK high call Loop call softdelay bcf PORTB,0 ;CLK low call softdelay bsf PORTB,0 ;CLK high call Loop2 call softdelay bcf PORTB,0 ;CLK low
ELX3 Eoghan O’Sullivan
[email protected]
Project Title call softdelay bsf PORTB,0 ;CLK high call Loop2 call softdelay bcf PORTB,0 ;CLK low clrf PORTB ;****************** bsf STATUS,RP0 ; SET PORTB clrf TRISB ; FOR OUTPUT bcf STATUS,RP0 ;***************** bcf PORTB,1 ;pull data line low for acknowledge call softdelay bsf PORTB,0 ;CLK high*** acknowledge pulse (9th) call softdelay bcf PORTB,0 ;CLK low bsf STATUS,RP0 ;******************* movlw 0x02 ; SET PORTB movwf TRISB ; FOR INPUT bcf STATUS,RP0 ;******************* call softdelay movlw 0x48 movwf Temp8 movlw 0x6d movwf Temp9 call sendout1
; call sendout call sendout ;send last 8bits to TX bsf PORTB,0 ;CLK high.........check sum first pulse call softdelay bcf PORTB,0 ;CLK low call softdelay bsf PORTB,0 ;CLK high call softdelay bcf PORTB,0 ;CLK low call softdelay bsf PORTB,0 ;CLK high call softdelay bcf PORTB,0 ;CLK low call softdelay bsf PORTB,0 ;CLK high call softdelay bcf PORTB,0 ;CLK low call softdelay bsf PORTB,0 ;CLK high call softdelay bcf PORTB,0 ;CLK low call softdelay bsf PORTB,0 ;CLK high call softdelay bcf PORTB,0 ;CLK low call softdelay
ELX3 Eoghan O’Sullivan
[email protected]
Project Title
Loop:
Loop2:
bsf PORTB,0 ;CLK high call softdelay bcf PORTB,0 ;CLK low call softdelay bsf PORTB,0 ;CLK high..end of check sum (8th pulse) call softdelay bcf PORTB,0 ;CLK low call softdelay bsf PORTB,0 ;CLK high call softdelay bcf PORTB,0 ;CLK low goto readtemp btfss PORTB,0 ;store the first 8 bits bcf STATUS,C ;*************************** movfw PORTB ;*************************** andlw 0x02 ;*************************** movwf Temp ;*************************** rrf Temp,0 ;*************************** andlw 0x0F ;*************************** iorwf Temp2,1 ;*************************** decf Temp3 ;*************************** btfss STATUS,Z ;*************************** rlf Temp2,1 ;*************************** return btfss PORTB,0 ;store the second 8 bits bcf STATUS,C ;*************************** movfw PORTB ;*************************** andlw 0x02 ;*************************** movwf Temp ;*************************** rrf Temp,0 ;********************** andlw 0x01 ;*************************** iorwf Temp4,1 ;*************************** decf Temp3 ;*************************** btfss STATUS,Z ;*************************** rlf Temp4,1 ;************************* return
softdelay:
Delayloop:
smalldelay:
exitdelay: TXsetup:
clrf DelayCount1 movlw 0xC0 movwf DelayCount2 decfsz DelayCount1,F goto smalldelay goto exitdelay decfsz DelayCount2,F goto smalldelay goto Delayloop Return bsf STATUS,RP0 movlw .207 ;1200 baud rate
ELX3 Eoghan O’Sullivan
[email protected]
Project Title movwf SPBRG ;load value into SPBRG movlw b'10100100' ;async high baud rate movwf TXSTA ;transmit config register bcf STATUS,RP0 movlw b'10000000' ;Enable serial port open movwf RCSTA return sendout:
bcf STATUS,RP0 movfw Temp2 ;move temp2 to w-reg movwf TXREG ;move w-reg to tx nop nop bsf STATUS,RP0 ;switch to bank1 bsf TXSTA,TXEN ;enable transmission nop bcf STATUS,RP0 ;switch to bank0 btfss PIR1,TXIF ;check tx empty goto $-1 nop movfw Temp4 ;Same code again movwf TXREG ;only this time its for nop ;sending second byte nop bsf STATUS,RP0 bsf TXSTA,TXEN nop bcf STATUS,RP0 btfss PIR1,TXIF goto $-1 movlw 'X' ; character sent out to make up 8 bits movwf TXREG nop nop movlw 'X' ; character sent out to make up 8 bits movwf TXREG nop nop movlw 'X' ; character sent out to make up 8 bits movwf TXREG nop nop movlw 'X' ; character sent out to make up 8 bits movwf TXREG nop nop return
sendout1:
bcf STATUS,RP0 movfw Temp8 ;move temp2 to w-reg movwf TXREG ;move w-reg to tx nop nop
ELX3 Eoghan O’Sullivan
[email protected]
Project Title bsf STATUS,RP0 ;switch to bank1 bsf TXSTA,TXEN ;enable transmission nop bcf STATUS,RP0 ;swictch to bank0 btfss PIR1,TXIF ;check tx empty goto $-1 nop movfw Temp9 ;Same code again movwf TXREG ;only this time its for nop ;sending second byte nop bsf STATUS,RP0 bsf TXSTA,TXEN nop bcf STATUS,RP0 btfss PIR1,TXIF goto $-1 return readtemp:
clrf PORTB bsf STATUS,RP0 clrf TRISB bcf STATUS,RP0 clrf Temp clrf Temp1 clrf Temp2 clrf Temp3 clrf Temp4 clrf Temp8 clrf Temp9
bsf PORTB,0 ;CLK high bsf PORTB,1 ;DATA high call softdelay bsf PORTB,0 ;CLK high bcf PORTB,1 ;DATA low call softdelay bcf PORTB,0 ;CLK low bcf PORTB,1 ;DATA low call softdelay bsf PORTB,0 ;CLK high bcf PORTB,1 ;DATA low call softdelay bsf PORTB,0 ;CLK high bsf PORTB,1 ;DATA high call softdelay bcf PORTB,0 ;CLK low bsf PORTB,1 ;DATA high
ELX3 Eoghan O’Sullivan
;transmission start
[email protected]
Project Title call softdelay bcf PORTB,1 ;DATA low, before clock change****** bsf PORTB,0 ;CLK high, now clock changes call softdelay bcf PORTB,0 ;CLK low bcf PORTB,1 ;DATA low call softdelay bsf PORTB,0 ;CLK high bcf PORTB,1 ;DATA low call softdelay bcf PORTB,0 ;CLK low bcf PORTB,1 ;DATA low call softdelay bsf PORTB,0 ;CLK high bcf PORTB,1 ;DATA low call softdelay bcf PORTB,0 ;CLK low bcf PORTB,1 ;DATA low call softdelay bsf PORTB,0 ;CLK high bcf PORTB,1 ;DATA low call softdelay bcf PORTB,0 ;CLK low bcf PORTB,1 ;DATA low call softdelay bsf PORTB,0 ;CLK high bcf PORTB,1 ;DATA low call softdelay bcf PORTB,0 ;CLK low bsf PORTB,1 ;DATA High Temperature command call softdelay bsf PORTB,0 ;CLK high bsf PORTB,1 ;DATA low temperature command bit high call softdelay bcf PORTB,0 ;CLK low bsf PORTB,1 ;DATA high temperature command line stays high call softdelay bsf PORTB,0 ;CLK high bsf PORTB,1 ;DATA high temprature line still high (final bit) call softdelay bsf STATUS,RP0 ;PORTB set for input movlw 0x02 ;******************* movwf TRISB ;******************* bcf STATUS,RP0 ;******************* bcf PORTB,0 ;CLK low bsf PORTB,0 ;CLK high call softdelay bcf PORTB,0 ;CLK low call softdelay bcf PORTB,0 ;CLK lo \\\\\\changed here 4clock off//// call softdelay bcf PORTB,0 ;CLK low
ELX3 Eoghan O’Sullivan
[email protected]
Project Title call softdelay bcf PORTB,0 ;CLK lo call softdelay bcf PORTB,0 ;CLK low call softdelay bcf PORTB,0 ;CLK lo call softdelay bcf PORTB,0 ;CLK low call softdelay bcf PORTB,0 ;CLK lo call softdelay bcf PORTB,0 ;CLK low \\\\\\\\resume clock///////// call softdelay movlw 0x08 ;move 8 into w-reg movwf Temp3 ;move w-reg to Temp3 to count number of bits saved clrw bsf PORTB,0 ;CLK high call Loop call softdelay bcf PORTB,0 ;CLK low call softdelay bsf PORTB,0 ;CLK high call Loop call softdelay bcf PORTB,0 ;CLK low call softdelay bsf PORTB,0 ;CLK high call Loop call softdelay bcf PORTB,0 ;CLK low call softdelay bsf PORTB,0 ;CLK high call Loop call softdelay bcf PORTB,0 ;CLK low call softdelay bsf PORTB,0 ;CLK high call Loop call softdelay bcf PORTB,0 ;CLK low call softdelay bsf PORTB,0 ;CLK high call Loop call softdelay bcf PORTB,0 ;CLK low call softdelay bsf PORTB,0 ;CLK high call Loop call softdelay bcf PORTB,0 ;CLK low call softdelay bsf PORTB,0 ;CLK high
ELX3 Eoghan O’Sullivan
[email protected]
Project Title call Loop call softdelay bcf PORTB,0 ;CLK low clrf PORTB ;****************** bsf STATUS,RP0 ; SET PORTB clrf TRISB ; FOR OUTPUT bcf STATUS,RP0 ;***************** call softdelay bcf PORTB,1 ;pull data line low for acknowledge bsf PORTB,0 ;CLK high********** acknowledge pulse (9th) call softdelay bcf PORTB,0 ;CLK low bsf STATUS,RP0 ;******************* movlw 0x02 ; SET PORTB movwf TRISB ; FOR INPUT bcf STATUS,RP0 ;******************* clrf Temp clrf Temp1 clrf Temp3 movlw 0x08 movwf Temp3 call softdelay bsf PORTB,0 ;CLK high call Loop2 call softdelay bcf PORTB,0 ;CLK low call softdelay bsf PORTB,0 ;CLK high call Loop2 call softdelay bcf PORTB,0 ;CLK low call softdelay bsf PORTB,0 ;CLK high call Loop2 call softdelay bcf PORTB,0 ;CLK low call softdelay bsf PORTB,0 ;CLK high call Loop2 call softdelay bcf PORTB,0 ;CLK low call softdelay bsf PORTB,0 ;CLK high call Loop2 call softdelay bcf PORTB,0 ;CLK low call softdelay bsf PORTB,0 ;CLK high call Loop2 call softdelay bcf PORTB,0 ;CLK low call softdelay
ELX3 Eoghan O’Sullivan
[email protected]
Project Title bsf PORTB,0 ;CLK high call Loop2 call softdelay bcf PORTB,0 ;CLK low call softdelay bsf PORTB,0 ;CLK high call Loop2 call softdelay bcf PORTB,0 ;CLK low clrf PORTB ;****************** bsf STATUS,RP0 ; SET PORTB clrf TRISB ; FOR OUTPUT bcf STATUS,RP0 ;***************** bcf PORTB,1 ;pull data line low for acknowledge call softdelay bsf PORTB,0 ;CLK high********** acknowledge pulse (9th) call softdelay bcf PORTB,0 ;CLK low bsf STATUS,RP0 ;******************* movlw 0x02 ; SET PORTB movwf TRISB ; FOR INPUT bcf STATUS,RP0 ;******************* call softdelay movlw 0x54 movwf Temp8 movlw 0x70 movwf Temp9 call sendout1 call sendout ;send bits to TX bsf PORTB,0 ;CLK high.........check sum first pulse call softdelay bcf PORTB,0 ;CLK low call softdelay bsf PORTB,0 ;CLK high call softdelay bcf PORTB,0 ;CLK low call softdelay bsf PORTB,0 ;CLK high call softdelay bcf PORTB,0 ;CLK low call softdelay bsf PORTB,0 ;CLK high call softdelay bcf PORTB,0 ;CLK low call softdelay bsf PORTB,0 ;CLK high call softdelay bcf PORTB,0 ;CLK low call softdelay bsf PORTB,0 ;CLK high call softdelay bcf PORTB,0 ;CLK low
ELX3 Eoghan O’Sullivan
[email protected]
Project Title
ISR:
call softdelay bsf PORTB,0 ;CLK high call softdelay bcf PORTB,0 ;CLK low call softdelay bsf PORTB,0 ;CLK high............end of check sum (8th pulse) call softdelay bcf PORTB,0 ;CLK low call softdelay bsf PORTB,0 ;CLK high call softdelay bcf PORTB,0 ;CLK low goto start ;Loop back to start retfie ;Dummy interruptservice routine End
ELX3 Eoghan O’Sullivan
[email protected]
Project Title
Appendix 3: Requirement Specification
Requirement Specification Eoghan O’Sullivan
Version 1.2
Status Reviewed Approved
ELX3 Eoghan O’Sullivan
[email protected]
Project Title
Contents STATUS ............................................................................................................................................... 41 1. 1.1. 1.2. 1.3. 1.4. 1.5. 2.
INTRODUCTION ...................................................................................................................... 44 WHAT IS THE AIM OF THE PRODUCT ? ............................................................................... 44 GOALS ................................................................................................................................. 44 USAGE .................................................................................................................................. 45 BACKGROUND INFORMATION ............................................................................................ 45 DEFINITION OF TERMS ....................................................................................................... 45 OVERVIEW OF THE SYSTEM .............................................................................................. 45
............................................................................................................................................................... 45 2.1. 2.2.
PRODUCT COMPONENTS ..................................................................................................... 45 DESIGN PHILOSOPHY .......................................................................................................... 45
3.
DELIVERY ................................................................................................................................. 46
4.
DOCUMENTATION ................................................................................................................. 47
ELX3 Eoghan O’Sullivan
[email protected]
Wireless Weather Station Document history Version
0.1
Date
10th Oct 08
ELX3 Eoghan O’Sullivan
Changes
First draft
[email protected]
Sign
Reviewed
eos
Page 43
2009-06-01 Wireless Weather Station
Introduction This project consists of the design of sensor system to record weather data and transmit this data back to a PC.
What is the aim of the product? To accurately measure the weather conditions and display the results on a
Req.No
1 2 3 4
Original/ Description of requirement Priority Changed Original To record temperature, humidity and wind speed on to the 1 PIC. Original Write a formal report documenting the project to include 1 graphs and tables demonstrating the success of the project. Original Make a project presentation and hopefully to demonstrate 1 a working prototype. Original To transmit data from the PIC back to the PC. 2
Figure 1. data.
A wireless weather station with a transmitter built in to transmit
Goals To design a working weather station that transmits data back to a PC and full y program a PIC chip.
ELX3 Eoghan O’Sullivan
[email protected]
44
2009-06-01 Wireless Weather Station
Usage This system could be used to measure the climatic conditions of a region, each sub-station would transmit back its data to a main hub and a better picture of the regions climate could be shown.
Background information Form research on the C.I.T server I found past reports on this project, I also researched in the internet and found other reports with useful information. www.web-ee.com/schematics/instumentations/wireless-weather-station/
Definition of terms www = World Wide Web
Overview of the system
Air Speed Sensor Temperature Sensor Humidity Sensor
Display
PIC Microcontroller Radio Transmitter
Figure 2.
Receiver
An overview of the system.
Product components Ill be using sensors to measure the weather conditions and a PIC to read the data. I will be using the zigbee standard to transmit the data in packets. I will use farnell to locate the sensors for the weather station and microchip to source my zigbee transmitter.
Design philosophy ELX3 Eoghan O’Sullivan
[email protected]
45
2009-06-01 Wireless Weather Station
Study some similar projects on this topic in order to understand my project more.
Delivery
Date
Assessment Criteria
Fri 10th October
Submit first draft of Project Specification with Minutes of Meetings for comments and feedback.
Fri 17th October
Submit final draft of Project Specification signed by supervisor.
Fri 24th October
Submit first draft of project Plan with Minutes of Meetings for comments and feedback.
Fri 7th November
Submit final draft of Project Plan signed by supervisor.
Fri 21st November
Submit Background Research/Information Chapter of Project Report.
Fri 28th November
Prepare 10minute Project Presentation.
Mon 1st – Wed 3rd December
Present Project Presentation and receive feedback.
Mon 8th – Thur 11th December
Present Project Presentation with 5 minute Q&A session to Departmental Staff.
Fri 12th December
Submit Written Report containing title page, table of contents, Chapter 1 Introduction, Chapter 2 Background Research, Appendix 1 Minutes of Meetings, Appendix 2 Project Specification and Appendix 3 Project Plan.
Fri 27th February
I hope to have the software for the PIC completed and communicating with the Zigbee.
Fri 27th March
I hope to have the portfolio well under way and the project almost complete.
Thur 29th April
Around this date I will be giving my presentation on my project and have a question and answers session.
Fri 1st May
I will had in my project plan book and prototype up to be corrected and assessed
ELX3 Eoghan O’Sullivan
[email protected]
46
2009-06-01 Wireless Weather Station
Documentation The word processor I will use for this project is Microsoft Word. The templates for the documents are from the LIPS project model, created b y Christian Krysander and Thomas Svensson.
.
ELX3 Eoghan O’Sullivan
[email protected]
47
2009-06-01 Wireless Weather Station
Appendix 4: Project Plan
Project Plan Eoghan O’Sullivan
Version 1.1
Status Name of Reviewer
Date
Reviewed Approved
ELX3 Eoghan O’Sullivan
[email protected]
48
2009-06-01 Wireless Weather Station
Contents
STATUS ............................................................................................................................................... 48 DOCUMENT HISTORY.................................................................................................................... 51 AN OVERVIEW OF THE SYSTEM ................................................................................................ 52 ............................................................................................................................................................... 52 1.1. 1.2. 2. 2.1.
PURPOSE AND GOAL ............................................................................................................ 52 DELIVERABLES ................................................................................................................... 52 DELIVERY ................................................................................................................................. 52 WHAT IS NOT INCLUDED .................................................................................................... 53
WORK BREAKDOWN STRUCTURE ............................................................................................ 53 THIS IS A LIST OF HOW LONG APPROXIMATELY IT WILL TAKE TO COMPLETE THE FOLLOWING TASKS. ............................................................................................................. 53 2.2. 2.3. 2.4.
BEFORE START .................................................................................................................... 53 DURING THE PROJECT ........................................................................................................ 53 AFTER THE PROJECT .......................................................................................................... 54
MEETING PLAN................................................................................................................................ 54 RESOURCE PLAN ............................................................................................................................. 54 2.5. 2.6. 2.7. 2.8.
PERSONS .............................................................................................................................. 54 COMPONENTS AND EQUIPMENT ........................................................................................ 54 WORK ROOMS ..................................................................................................................... 54 ECONOMY ............................................................................................................................ 54
MILESTONES AND TOLLGATES ................................................................................................. 54 2.9. 2.10.
MILESTONES ....................................................................................................................... 54 TOLLGATES ......................................................................................................................... 55
SCHEDULE ......................................................................................................................................... 55 RISK ANALYSIS ................................................................................................................................ 55
ELX3 Eoghan O’Sullivan
[email protected]
49
2009-06-01 Wireless Weather Station REFERENCES .................................................................................................................................... 56
ELX3 Eoghan O’Sullivan
[email protected]
50
2009-06-01 Wireless Weather Station
Document history
Versio Date n
Changes
sign
0.1
21st October 2008
First draft
Eos
1.1
5th November 2008
Second draft
Eos
ELX3 Eoghan O’Sullivan
[email protected]
Reviewed
51
LiTH Projektuppgiftstitel
2006-09-14
An overview of the system
Air Speed Sensor Temperature Sensor Humidity Sensor
Display
PIC Microcontroller Radio Transmitter
Receiver
Purpose and goal This system has various sensors which measure the weather conditions, a microcontroller then sends them to a transmitter where data is sent via a wireless to a receiver and the data is displayed on a display.
Deliverables
Delivery
Date
Assessment Criteria
Fri 10th October
Submit first draft of Project Specification with Minutes of Meetings for comments and feedback.
Fri 17th October
Submit final draft of Project Specification signed by supervisor.
Fri 24th October
Submit first draft of project Plan with Minutes of Meetings for comments and feedback.
Fri 7th November
Submit final draft of Project Plan signed by supervisor.
Fri 21st November
Submit Background Research/Information Chapter of Project Report.
Projektkursens namn Dokumentansvarig project report
Projektgrup ev. e-postadress till projektgr 52
LIPs
2009-06-01 Wireless Weather Station Fri 28th November
Prepare 10minute Project Presentation.
Mon 1st – Wed 3rd December
Present Project Presentation and receive feedback.
Mon 8th – Thur 11th December
Present Project Presentation with 5 minute Q&A session to Departmental Staff.
Fri 12th December
Submit Written Report containing title page, table of contents, Chapter 1 Introduction, Chapter 2 Background Research, Appendix 1 Minutes of Meetings, Appendix 2 Project Specification and Appendix 3 Project Plan.
Fri 27th February
I hope to have the software for the PIC completed and communicating with the Zigbee.
Fri 27th March
I hope to have the portfolio well under way and the project almost complete.
Thur 29th April
Around this date I will be giving my presentation on my project and have a question and answers session.
Fri 1st May
I will had in my project plan book and prototype up to be corrected and assessed
What is not included This system does not have the capabilities to transmit over long distances so it would not be the most practical weather station to be made.
Work Breakdown Structure
This is a list of how long approximately it will take to complete the following tasks.
Before start No 1. 2. 3. 4.
Activity Project Specification Project Plan Backgroung Research and Information Chapter Order Components
Description Write project specification Research project and produce project plan Research what exaclty the project is about and an information chapter for the project book Order the sensors for the project
During the project ELX3 Eoghan O’Sullivan
[email protected]
53
Est. Time 2 days 2.3days 2 days
1 day
2009-06-01 Wireless Weather Station
No 5. 6. 7.
Activity Get the sensors working Set up transmitter Write software
8.
Test it as a whole unit and tidy up the appearance
Description To read in data onto the PIC Set up the Zigbee protocol to send data To take the variables and put them in a program to and display the result on the screen Make sure its working and to make a housing for the board and transmitter
Est. Time 3 weeks 2 weeks 3 weeks
Description A detailed written report on the project A 15minute presentation on the project where i show a working prototype
Est. Time 1 weeks 2 weeks
2 weeks
After the project No 9. 10.
Activity Final Report Final Presentation
Meeting plan
My supervisor Dr.Oliver Gough and I meet once a week in PF46. The time varies week to week due to status of the project.
Resource plan Persons
Dr. Oliver Gough and Eoghan O’Sullivan
Components and Equipment I will need to order sensors for the weather station, included in the li st are: Temperature sensor, Humidity sensor and a Wind speed sensor. I also need to order a PIC board and a zigbee standard s ystem to transmit my data. For the software I will be using MatLab to write up code for th e PIC.
Work rooms Most of the work I can do in the senior lab B176a, I can also do work at home as I have tools to assist me.
Economy I am hoping to source all the components for under 60eur. This is subject to change as I have not confirmed what exactly I need yet.
Milestones and tollgates Milestones
ELX3 Eoghan O’Sullivan
[email protected]
54
2009-06-01 Wireless Weather Station No 1. 2. 3. 4. 5. 6. 7. 8. 9. 1
Description Requirement specification ready Project Plan ready Background Research/Information Chapter of Project Report ready. Order Components Sensors working Transmitter working Get software fully written and working Fully working and testing underway Final written report Final Presentation
Date 24/10/2008 7/11/2008 21/11/2008 11/11/2008 20/02/2009 6/03/2009 27/03/2009 10/04/2009 17/04/2009 30/04/2009
Tollgates No 1 2 3 4 5 6 7
Description Approval of project specification Approval of project plan Approval of Chapter one of project report Sensors working and reading on the PIC Sending data to a PC Working fully with software implemented Final Presentation
Date 24/10/2008 7/11/2008 21/11/2008 20/02/2009 27/03/2009 10/04/2009 30/04/2009
Schedule
Risk analysis
Programming is my weakness, I hope to have the sensors connected to the PIC and reading the data with no flaws. If I get bogged down in programming I might lose time that I could use in doing something else to the project.
ELX3 Eoghan O’Sullivan
[email protected]
55
