OBD stands for onboard built-in diagnostics. As the name suggests, this is a built-in diagnostic system for all modern cars (after 1996). It has a computer-based application that can monitor the performance of the car through your speed, mileage, fuel emission data, etc. In addition, it can also measure some important life parameters of the engine. This complete system is called ECU (Engine Control Unit).

The OBD connector is only used by maintenance personnel to monitor the health of the car and provide diagnosis. In addition, it can also control the warning lights on the car dashboard.
How to use OBD-II connector on Arduino/Raspberry Pi
It is a federal law to modify or tamper with the OBD system of a car, but if an engine malfunction light appears on your car and you want to diagnose the problem yourself, it is very easy to use a connector like ODB-II to connect your Car and microcontroller or Between the microprocessors. Once you enter all the important details of the car into a development platform such as Arduino or Raspberry Pi, the applications are endless.
The OBD port can be found on the dashboard near the steering wheel of each car. The location of the port varies from manufacturer to manufacturer, and for aesthetic reasons, it is usually hidden in blind spots. After finding the port, please hook the connector and connect the other end to the STN1110 OBD UART board. Then connect the UART board to the computer, and communicate on the computer through the Tx, Rx and Ground pins. The normal data type will have a baud rate of 9600, which will have 8 data bits and 1 stop bit, and no parity. . Then, we can use any serial communication software (such as Putty, or even Arduino) to talk to the car through AT commands. Each AT command has a specific task to perform or return a specific value. You can learn more about the interface through the sparkfun hookup tutorial. Explains how to establish and initiate a connection.
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