Difference between revisions of "S16: Warriors"

Revision as of 01:17, 24 May 2016

Grading Criteria

Project Title

WiFi Based Sensor System

Abstract

The most basic aspect of an IoT system is the network of devices/objects. IoT allows objects to be sensed and controlled remotely across existing network infrastructure. This project is based on the same fundamental. SJOne board senses temperature, light intensity, and GPS (SIM800) module. WiFi capability is added to SJOne board using ESP8266 serial module. SJOne(client) transmits the sensor data over the network to the server. Raspberry Pi 3 acts as a server, receives the data from the client and stores it in mysql database. A php webpage takes the most recent entry from database and displays on the webpage along with map.

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

--> Software Architecture, Rasberry Pi setup, ESP8266 firmware development

Sujeeth Emmadi

--> Software Architecture, Wiki Report, PHP webserver

Bharat Khanna

--> Interface SIM808 with ARM microcontroller (Firmware development), Hardware support

Veena Manasa Kanakamalla

--> Wiki Report, Sensor interface, Hardware Support

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.

Parts List & Cost

Design & Implementation

System consists of two entities. A client and a server.

System Block Diagram

Components

SJOne Board

SJOne board

• Built-in Temperature Sensor.
• Software Stack for Mesh Network.
• Built-in Light Intensity Sensor.
• Many GPIOs with two SPI, Multiple UARTs, and I2C availability.
• Power from USB or External Power.
• PWM support.

The SJOne board offers whole lot of features out of which the temperature sensor, light intensity sensor and UART interfaces are utilized for the project.

The WiFi Module - ESP8266

SJOne board

The features of ESP8266, as given by adafruit, are:

• 1 x Analog input (1.8V max)
• 9 x GPIO (3.3V logic), which can also be used for I2C or SPI
• 2 x UART pins
• 2 x 3-12V power inputs, reset, enable, LDO-disable, 3.3V output

Though it has the option of working on I2C or SPI, we have used UART for integration in our project.

SIM808 GPS Module

SJOne board

• Built-in Nordic Wireless (Board-to-Board communication).
• Software Stack for Mesh Network.
• 4 Switches and 4 LEDs (both hard-wired).
• Many GPIOs with two SPI, Multiple UARTs, and I2C availability.
• Power from USB or External Power.
• PWM support.

The SJOne board offers whole lot of features out of which wireless communication (Nordic), GPIO, I2C and PWM timers are utilized for the project. The I2C feature was used to communicate with the Raspberry pi, GPIO's used to drive stepper motors, PWM's to drive servo motors, Nordic for wireless communicaton between SJOne boards.

Raspberry Pi 3

SJOne board

• A 1.2GHz 64-bit quad-core ARMv8 CPU with 1 GB RAM
• On board 802.11n Wireless LAN
• 40 GPIO pins and many serial interfaces
• Micro SD card slot
• On board chip antenna for radio

The Raspberry Pi 3 is the third generation Raspberry Pi, GPIO, I2C and PWM timers are utilized for the project. The I2C feature was used to communicate with the Raspberry pi, GPIO's used to drive stepper motors, PWM's to drive servo motors, Nordic for wireless communicaton between SJOne boards.

ESP8266 interface with SJOne

--- The WiFi module, ESP8266, is interfaced with the SJOne board over the UART. We used the UART3 present on the SJOne board to the UART of ESP8266. The RX pin from ESP8266 is connected to pin P4.28 of SJOne (TX) and TX pin of ESP8266 to pin p4.29 of SJOne(RX).

SIM808 GPS Module Interface with SJOne

The SIM808 module is interfaced to SJOne using UART. The Transmit and Receive pins of the GPS module are connected to UART2 of SJOne. RX pin of GPS is connected to pin P2.8 of SJOne (TX) and TX pin of GPS is connected to pin P2.9 of SJOne (RX).

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

Describe the challenges of your project.

• 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.

Include sub-sections that list out a problem and solution, such as:

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

• Sourceforge

References

Acknowledgement

Any acknowledgement that you may wish to provide can be included here.

References Used

• Adafruit-SIM808
• Adafruit-ESP8266
• Adafruit_ESP8266_Github
• Adafruit_SIM808_Github

Appendix

You can list the references you used.