F12: OBD-II Android Monitor

Abstract

Interfacing an ELM Electronics ELM327 OBD-II to RS232 interpreter to an Android mobile device. The Android mobile device connects to the interpreter via Bluetooth and gathers information through a designed application. The designed application will be able to gather real time information from the vehicle such as RPM, MPH, and intake temperature. The designed application will also be able to clear diagnostic trouble codes.

Features & Objectives

The OBD-II Android Monitor project establishes a wireless Bluetooth communication link between an Android mobile device and an automobile’s On-Board Diagnostics system (OBD). Information is transmitted between these components using an ELM Electronics ELM327 microcontroller. The ELM327 converts data from OBD-II protocols to RS-232, emulating the Bluetooth communication to run in serial port profile (SPP). To interface an Android device with the ELM327, an application will be designed. This application will have a graphical user interface (GUI) which will be able to display vehicle information such as MPH and RPM. The objectives for the OBD-II Android Monitor project is shown below.

• Establish communication with vehicle on board diagnostics computer with Android device
• Design and create Android Application with features of:

a) Gather real time vehicle engine information such as Intake temperature, Engine coolant temperature, MPH, RPM, MPG, etc.

b) Read and clear check engine lights (CEL)

Team Members

• Ryan James Cristobal
• Jonathan Luong

Schedule

Week Number	Date	Tasks	Tasks Completed
1	10/20 - 10/26	Gather and order parts Install Android SDK and tools Review component data sheets	Parts ordered on 10/25 Installed SDK on Eclipse and ADT (Android Emulator) Obtained PDF of OBD-II datasheet
2	10/27 - 11/2	Gather and test components Establish Android app requirements Begin Android app design	ELM327 Controller Obtained, and tested. User Interface Requirements Established -ELM327 will use SPP to communicate between OBD-II and Android device Android App functions: -One screen to display data parameters -Displayed data will be refreshed in real-time
3	11/3 - 11/9	Finalize Android app design Begin Android app implementation	____ ____ ____
4	11/10 - 11/16	Establish communication link between OBD-II and Android phone Develop UI design	____ ____ ____
5	11/17 - 11/23	Continue UI design Prepare system testing	____ ____ ____
6	11/24 - 11/30	Begin system testing Begin finalizing project report	____ ____ ____
7	12/1 - 12/7	Finish project report Finish system testing Demo project	____ ____ ____

Parts List & Cost

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Design & Implementation

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Hardware Design

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Hardware Interface

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Software Design

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Implementation

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Testing & Technical Challenges

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Conclusion

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References

Acknowledgement

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References Used

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Appendix

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