S14: Android based home monitoring system
Contents
Grading Criteria
- How well is Software & Hardware Design described?
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- Code Quality
- Overall Report Quality:
- Software Block Diagrams
- Hardware Block Diagrams
- Schematic Quality
- Quality of technical challenges and solutions adopted.
Android based home monitoring system
Abstract
The home monitoring system is designed to monitor light and temperature of different rooms. The monitoring system will monitor light and temperature of different rooms and report the status to the user via an android application.
Features
- Light and temperature monitoring of multiple rooms
- Android application to view status of sensors
Team Members
- Om Narasimhan
- Software design and Android App development
- Aysha Malik
- Hardware interface design and integration
- Sri Latha Ayyannagari
- FreeRTOS driver design and development
Schedule
| Sl. No | Start Date | End Date | Task | Actual |
|---|---|---|---|---|
| 1 | 2/28 | 2/28 | Order Components and Make a schedule | Completed) |
| 2 | 3/1 | 3/10 | Components Procurement. | Completed (03/06/2014) |
| 3 | 3/6 | 3/6 | Identify tasks assign work | Completed (03/06/2014) |
| 4 | 3/6 | 3/13 | Study about bluetooth module and its interfacing | Completed |
| 5 | 3/6 | 3/13 | Learn application development using Android, Complete hardware interfaces | Completed |
| 6 | 3/13 | 3/18 | Finish software design and conduct reviews | Completed |
| 7 | 3/18 | 4/8 | Develop App to establish communication b/w bluetooth device android device, Add component in app to discover available devices,Develop SPP emulator for android app | Completed |
| 8 | 4/8 | 4/18 | working on developing data transfer protocol and communicating with multiple devices at the same time | In progress |
| 9 | 4/18 | 4/25 | Integrate code and start testing | Not yet started |
| 10 | 4/25 | 4/30 | Resolve issues if any | Not yet started |
| 10 | 4/30 | 5/3 | Final Testing | Not yet started |
Parts List & Cost
| Qty | Description | Manufacturer | Part Number | Total Cost |
|---|---|---|---|---|
| 3 | SJOne Board | SJSU | - | $240.00 |
| 3 | 2013 Bluetooth Master UART Board Communication Module- 4 Needle Blue | $22.50 | ||
| 1 | Samsung Galaxy S4 | Samsung | - | |
| Total Cost | ! |
Design & Implementation
The project was completed in a number of steps
1. Device driver development
2. Android Application development
Hardware Design
Basic Bluetooth module (JY-MCU HC-06) was purchased from ebay for $8 including shipping. This particular series (HC-06) has four pins RX, TX, VCC and GND and can only work in slave mode. The module specification mentions that the module can be reprogrammed, but the KEY and STATE pins are not available in this series (HC-06).
Note: Although VCC pin indicates that the module works with 3.6-6V, connecting it to the LPC1758 3.3V output worked fine.
Hardware Interface
This project uses UART2 for communication.The default setting for UART is: Baud Rate - 9600, no parity, one start bit and one stop bit.
Software Design
Parameters are monitored by devices placed in each room. The monitoring device communicates to android application using Bluetooth. The application records incoming data from different devices and continuously analyses it. Interpretation of the data can either be done in real time or at fixed intervals and logical decisions are taken (e.g, no motion sensor update for X minutes, so switch off lights, or based on the historical data, switch on lights at a particular time ..etc)
- Application GUI
We implemented the Application GUI in three parts
● The first screen for application is for home station selection
○ <insert screenshot here>
● As you can see in the screen shot, there are three buttons to select among three home stations. Upon selecting a weather station (denoted by “roomX”, X => 1, 2, and 3), the application establishes a connection to the Bluetooth agent in the weather station. ● Once connection is established, the status is shown to the user as “connection established” or “connection failed”
● There are 4 different buttons viz,
Current temperature Read the current temperature
Current luminosity Read the current luminosity
Historical temperature Historical temperature data and graphs
Historical luminosity Historical luminosity data and graphs
○ <Insert screen shots for all these four here>
● Graphing method
○ Our graphics are primarily based on the library “androidplot” downloadable from (www.androidplot.com)
○ AndroidPlot is a very powerful package to plot graphs. The input for graphing method are two arrays of type Number. To plot an XY graph, these numbers are converted to XY-Series data type and use a LineandPointFormatter class. Once X-axis plane is fully plotted, another series will be used to plot Y- axis plane.
- Application configuration
<TODO>
- Data Analysis
<TODO>
- Data structures
Every board gathers temperature and Luminosity samples at fixed intervals. The interval is configurable and default is set at 5sec. Initially, our first choice was to use a FIFO for storing these readings. But then, it became very difficult to discard older entries. Although we planned to have a timeout mechanism associated with every entry, later we figured out that a FIFO implementation based on a circular buffer would be easier to implement and maintain.
Here is a graphical representation of our FIFO based on a circular buffer.
- Communication protocol
<TODO>
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
Appendix
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