The document describes testing and development of a system to connect an Android phone to a vehicle's OBDII port using Bluetooth. Hardware testing ensured correct data transmission between the OBDII port and microcontroller. Software was tested by developing Android and PC applications to communicate with the microcontroller. The final product allows users to view real-time vehicle data and fuel efficiency metrics from their phone.

1. OBDII Connection to Android Phone Testing Approach Hardware To test the hardware design the connector was plugged into the car and requests were sent to the ODBII and the response was displayed to ensure the correct data was received. The Bluetooth was tested by using a simple phone application to send a two character message to the micro and having the micro send back the two characters plus an @. Software The software was tested first by writing a simple application to talk to the micro via Bluetooth. Then the functionality was tested by using an Android emulator on a PC. Each function was tested separately to ensure it worked on its own. Abstract Adam Zier Zach Schulz The On-Board Diagnostic revision II (OBDII) connector on a vehicle is a powerful tool that can be used to troubleshoot car performance and engine status. By connecting the OBDII to an Android cell phone wirelessly using Bluetooth this data is easily accessed. The problem is currently there is no easy way for an average driver to receive and put to use the data from the OBDII. This system solves this problem by giving an average driver the ability to access the data easily on an Android cell phone to use the data to improve gas consumption and keep track of maintenance schedule. A cell phone running the Android operating system was chosen to communicate with our small device that is plugged into the OBDII port. Our application on the phone can show the gas mileage, check engine light status, and other information about the car. The program shows the data as it is happening and can save the data for when the car is off. Final Product The final design is completed as planned. It was able to accomplish all tasks originally desired. The phone’s application connects to the OBDII through the Bluetooth and micro. The data received from the OBDII is stored local in a database provided by the Android OS. The user interface gives the user an easy way to view the information calculated from the data. There is plenty of room for future improvements. The application has the ability to easily add functionality. Also, there could be improvement for all OBDII protocols to be included. As an added element of the overall project there could be a website that users could log into. The website could store long term data and display data easier then the phone. Design Requirement Technical Approach Design Objectives The major objective of our project was to connect an Android Phone to the On-Board Diagnostic revision II (OBDII). This was accomplished by using a microcontroller to talk to the OBDII through a connector. The microcontroller then uses a Bluetooth module to send data to the phone and receive requests from the phone. With an application the phone receives the data and manipulates the data into useful information. The information is then displayed on the phone through a user interface on the phone. OBDII Bluetooth Transmitter Connects to Introduction Microcontroller uses Problem/Need For a driver to access the data from the OBDII requires expensive equipment. Even with the equipment getting useful information from the data can be cumbersome and complicated; requiring the user to know how to manipulate the data to calculate information such as MPGs. Intended users and uses The intended user is the average drive that is interested in getting information from the OBDII to help improve gas consumption and troubleshoot Engine light codes. The Intended use is to be used while driving to collect trip and calculate instantaneous information. Assumptions and Limitations The major limitation of this project is that it requires the user to have a cell phone running the Android operating system (OS). However, there is the ability to write an application for other phones such as the IPhone to interact with the hardware. To send to Android Application Android Phone Displays in Budget Interfaces with User