jOBDII

A Java library for communicating with devices over the OBDII protocol.

The library allows you to build applications that communicate with an OBDII device. It provides a generic interface as well as a specific implementation for devices that use the ELM-compatible chipset over a (real or virtual) RS-232 serial port.

Put differently, you can use this to talk to the computer in your car.

Applications

Your car knows a lot of things, OBDII is the simplest way to access it.

See my car hacking stuff for more information on how I personally use this.

Requirements & Setup

To be able to use the library, you'll need:

• The jrs232 package package, which exposes `com.willmeyer.jrs232', and its own installation requirements
• An ELM-compatible device connected via a real or virtual serial port (search for ELM 327 serial interface devices).

Using the Library

See com.willmeyer.jobdii.Elm32x.

You can learn more about the protocol itself in the included datasheet.