SparkFun OBD-II UART

This board allows you to interface with your car's OBD-II bus. It provides you with a serial interface using the ELM327 command set and supports all major OBD-II standards such as CAN and JBUS. The board also provides a footprint that mates directly to our FTDI Basic. The DB9 connector mates with our DB9 to OBD-II cable. On-Board Diagnostics, Second Generation (OBD-II) is a set of standards for implementing a computer-based system to control emissions from vehicles. It was first introduced in the United States in 1994, and became a requirement on all 1996 and newer US vehicles. Other countries, including Canada, parts of the European Union, Japan, Australia, and Brazil adopted similar legislation. A large portion of the modern vehicle fleet supports OBD-II or one of its regional flavors. Among other things, OBD-II requires that each compliant vehicle be equipped with a standard diagnostic connector (DLC) and describes a standard way of communicating with the vehicle’s computer, also known as the ECU (Electronic Control Unit). A wealth of information can be obtained by tapping into the OBD bus, including the status of the malfunction indicator light (MIL), diagnostic trouble codes (DTCs), inspection and maintenance (I/M) information, freeze frames, VIN, hundreds of real-time parameters, and more. STN1110 is an OBD to UART interpreter that can be used to convert messages between any of the OBD-II protocols currently in use, and UART. It is fully compatible with the de facto industry standard ELM327 command set. Based on a 16-bit processor core, the STN1110 offers more features and better performance than any other ELM327 compatible IC. Get started with the OBD-II UART Guide

Features

* Fully compatible with the ELM327 AT command set

* Extended ST command set

* UART interface (baud rates from 38 bps to 10 Mbps)

* Secure bootloader for easy firmware updates

* Support for all legislated OBD II protocols:

* ISO 15765-4 (CAN)

* ISO 14230-4 (Keyword Protocol 2000)

* ISO 9141-2 (Asian, European, Chrysler vehicles)

* SAE J1850 VPW (GM vehicles)

* SAE J1850 PWM (Ford vehicles)

* Support for non-legislated OBD protocols:

* ISO 15765

* ISO 11898 (raw CAN)

* Support for SAE J1939 OBD protocol

* Superior automatic protocol detection algorithm

* Large memory buffer

* Voltage input for battery monitoring

Resources

* Schematic

* Eagle Files

* Hookup Guide

* OBD=II Guide

* Datasheet (STN1110)

* Datasheet (MCP2551)

* Datasheet (ELM327)

* ELM327 Command Set

* Compatible Software List

* GitHub Repo