S16: Warriors
Contents
Grading Criteria
- How well is Software & Hardware Design described?
- How well can this report be used to reproduce this project?
- Code Quality
- Overall Report Quality:
- Software Block Diagrams
- Hardware Block Diagrams
- Schematic Quality
- Quality of technical challenges and solutions adopted.
Project Title
WiFi Based Sensor System
Abstract
The most basic aspect of an IoT system is the transmission of data over the internet. WiFi based sensor system consists of a a hub of sensors that measure temperature, light intensity, which are found on the SJOne Board and position (GPS), using SIM800 GPS module. The WiFi module, ESP8266, is interfaced with the SJOne board, making it act like a client, which transmits the sensor hub data over the connected network. The data is received by the server over the same network, which is hosted by the Raspberry Pi 3. The data is represented on a webpage which gets updated with the new data every few seconds. The server consists of a basic database, created using MySQL, that keeps a record of the data as it gets updated continuously.
Objectives
1) Set up sensor hub:
- Interface GPS module with SJOne
- Write drivers to access the temperature and light intensity sensors on-board SJOne
2) Set up TCP Client:
- Interface the WiFi module with SJOne board and implement a TCP client
- Write device driver to transmit data from SJOne client to the server
3) Set up TCP Server:
- Use Raspberry Pi 3 to work as a TCP server to receive data from client
- Create a database to keep a record of previously acquired data
4) Set up Webserver:
- Start the web server and host a webpage
Team Members & Responsibilities
- Ankit Gandhi
- Rasberry Pi environment setup, Hardware support
- Bharat Khanna
- Interface ESP8266 with ARM microcontroller(Firmware development), Hardware support
- Sujeeth Emmadi
- Veena Manasa Kanakamalla
Schedule
This section of the report provides the team schedule for the Assembly line project, indicating the milestones to be achieved during the course of the project.
| SI No. | Start Date | End Date | Task | Status | Actual Completion Date |
|---|---|---|---|---|---|
| 1 | 03/21/2016 | 03/27/2016 |
|
Completed | |
| 2 | 03/28/2016 | 04/03/2016 |
|
Completed | |
| 3 | 04/04/2016 | 04/10/2016 |
|
Completed | |
| 4 | 04/11/2016 | 04/17/2016 |
|
Completed | |
| 5 | 04/18/2016 | 04/24/2016 |
|
Completed | |
| 6 | 04/25/2016 | 05/01/2016 |
|
Completed | |
| 7 | 05/02/2016 | 05/08/2016 |
|
Completed | |
| 8 | 05/09/2016 | 05/15/2016 |
|
Completed | |
| 8 | 05/16/2016 | 05/22/2016 |
|
In Progress |
Parts List & Cost
| Item# | Part Description | Vendor | Qty | Cost |
|---|---|---|---|---|
| 1 | Raspberry Pi | Adafruit | 1 | $39.95 |
| 2 | ESP8266-Wifi Module | Adafruit | 1 | $9.95 |
| 3 | SIM808 GPS/GSM Module | Adafruit | 1 | $49.95 |
| 4 | Passive GPS Antenna uFL | Adafruit | 1 | $3.95 |
| 5 | USB to TTL Serial Cable | Adafruit | 1 | $9.95 |
Design & Implementation
Block Diagram
Hardware design for GPS and ESP8266 interface
peripheral interface board design
Raspberry Pi
- Raspberry Pi 3 is powered with Broadcom BCM2837 1.2GHz 64-bit quad-core ARMv8 processor.
- Integrated 802.11n wireless LAN
- Raspberry Pi is used as Web Server
SIM808 GPS/GSM Module
- Raspberry Pi 3 is powered with Broadcom BCM2837 1.2GHz 64-bit quad-core ARMv8 processor.
- Integrated 802.11n wireless LAN
- Raspberry Pi 3 is used as Web Server
ESP8266 Wifi Module
- Raspberry Pi is powered with Broadcom BCM2837 1.2GHz 64-bit quad-core ARMv8 processor.
- Integrated 802.11n wireless LAN
- Raspberry Pi is used as Web Server
Hardware Interface
The hardware design includes PCB designing using cadsoft Eagle(software for PCB board designing). The circuit of developed PCB board includes interfacing peripheral like SIM808(GSM/GPS module), ESP826( Wi-Fi module), LSM303(Accelerometer & Magnetometer) with ARM cortex-M3 microcontroller and raspberry Pi. I2C, UART and TCP/IP are the three communication protocols that are being used in the project for establishing communication between temperature/light sensor, SIM808/ESP8266 & raspberry pi and ARM microcontroller respectively.
Software Design
The software has been developed on FreeRTOS using C/C++ programming language including features of real-time embedded system. The software involves device driver development for I2C and UART protocol which are used to establish communication between SIM808(GSM/GPS module) & ESP8266(Wi-Fi) with the microcontroller. The code also includes implementation of fetching data like latitude & longitude of the current location, temperature, and luminosity at every timestamp. The data that is being collected on real time basis from the peripheral devices is continuously transmitted to the server(Raspberry Pi) by ESP8266 module using TCP/IP protocol. Socket programming is written on the server(Raspberry Pi) which is continuously listening to the ESP8266 module. On receiving data from the client(Microcontroller) the data is being manipulated and is being able to be displayed on the user-friendly web page using PHP language.
Implementation
This section includes implementation, but again, not the details, just the high level. For example, you can list the steps it takes to communicate over a sensor, or the steps needed to write a page of memory onto SPI Flash. You can include sub-sections for each of your component implementation.
Testing & Technical Challenges
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- First and very important aspect for any project is requirement gathering.
Make a smooth transition to testing section and described what it took to test your project.
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Issues
#1 LPC17xx UART Rx FIFO
- LPC17xx UART not able to receive more than 16 bytes
- Resolution :
- Used interuppt to solve this problem.
Conclusion
The project is based on embedded platform, implementing the concepts of semaphore, Task scheduling, queues etc. Addendum to this we have also implemented features of networking like socket programming and interfacing our output with a user-friendly interface on the web page using Internet of Things. This project helped us in learning a complete embedded application from hardware design till user interface that can be used at a commercial level.
Project Video
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Project Source Code
References
Acknowledgement
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References Used
Appendix
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