S14: Android based Automation
Contents
Grading Criteria
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- Code Quality
- Overall Report Quality:
- Software Block Diagrams
- Hardware Block Diagrams
- Schematic Quality
- Quality of technical challenges and solutions adopted.
Project Title
ANDROID BASED AUTOMATION
Abstract
This project is to develop an Android application which can be used to switch an electrical appliance On/Off, and notify the status to the user through his mobile device. Here we connect an Android Application running device to the SJSU One board using Bluetooth protocol and make the board detect the signals coming from the Android device via a Bluetooth module. This board generates operation in according to the incoming signals.
Objectives & Introduction
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Team Members & Responsibilities
- Bhargava Kunchanapalli
- (Hardware Implementation)
- Harsha
- (Android Development)
- Kiran Vaddey
- (Device Drivers and FreeRTOS Programming)
Schedule
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Schedule
| Date | Task | Status | Notes | |
| 2/24 | Project Reviewing | Completed | ||
| 3/6 | Parts Ordered | Completed | ||
| 3/13 | Review Data sheets & Bluetooth module interfacing | Completed | ||
| 3/20 | Installation of Android SDK and Designing a blue print of the application | Completed | ||
| 3/27 | Android Application development (Continued...) | Completed | ||
| 4/3 | Interfacing the mobile application with SJ-One Board using Bluetooth module | Completed | ||
| 4/10 | Setup the interface between the SJ-One Board and External Peripherals | Completed | ||
| 4/17 | Improving software functionality on Unique Features | Completed | ||
| 4/24 | Testing and Debugging | Completed | ||
| 5/1 | Testing and Debugging | Completed | ||
| 5/8 | Final Demo | Pending |
Parts List & Cost
| Qty | Description | Total Cost |
|---|---|---|
| 1 | HC - 05 Bluetooth UART Module | $10.00 |
| 1 | SJ One Board | $160.00 |
| 1 | Relay Module | $10.00 |
| 1 | Any Android Phone | $0.00 |
| Total Cost | 180.00 |
Design & Implementation
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Hardware Design
Electrical Switching Circuitry The electrical switching is done using a circuitry which uses relays to switch the lines. The voltage we handle here is 110V and frequency 60Hz. The transistor used in here produce sufficient current that is approximately 200V with a voltage supply of 9V rather than traditional 5V supply with drives less current when used against SJSU One board and it is used to switch the operation of the relay. The 3.3V supplied by the SJSU One board from the GPIO port is not sufficient to power the relay so the relay control board is been used in this project. As seen below, the circuit consists of a transistor, an LED, and a power supply.
The LED is connected to the control signal to show whether the relay should be turn on or turn off. The transistor acts as a switch to enable and disable the relay depending on the signal received from SJ One board. When the LPC 1768 gets the data frame from the Android application it processes it for signal and pass code where signal is processed in switch_task in our program to act accordingly. The pass code is matched against the codes which are pre assigned to identify the user.
Hardware Interface
UART Bus The UART bus is used to communicate between Bluetooth device and the microcontroller. UART pins are power on the SJ One board using UART init function API provided by the FreeRTOS. The initialized pins are driven by the UART driver to handle the communication. Each of the UART pin if logic high produce a output voltage of 3.3V and if logic low produce a 0.0V. The SJ One board has a switch between UART-2 & UART-3, to make a selection. If we want to uses both for them then we have to use them as GPIO pins. GPIO Port The GPIO port is used to enable or disable the transistor and the indicator LED. When the LPC1768 micro-controller recognizes a pass code that is sent from the Android, it will send 3.3V through the GPIO which is connected to the relay circuit. Above is the GPIO initialization function. We have used port-1 pins that is P0.0 and P0.1 pins to give a 3.3V voltage to the relay circuit board. First the pins need to be selected and then the direction of the pin needs to be specified. For instance an output pin would be set to a 1 while an input would be set to 0.
Software Design
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Implementation
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Testing & Technical Challenges
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My Issue #1
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Conclusion
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Project Video
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Project Source Code
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References
Acknowledgement
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References Used
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Appendix
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