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 https://elecena.pl/product/22725535/sparkfun-obd-ii-uart 2023-03-07 https://elecena.pl/product/22725535/sparkfun-obd-ii-uart 2023-06-17 https://elecena.pl/product/22725535/sparkfun-obd-ii-uart 2023-12-27 https://elecena.pl/product/22725535/sparkfun-obd-ii-uart 2024-09-19 https://elecena.pl/product/22725535/sparkfun-obd-ii-uart 2024-11-29 https://elecena.pl/product/22725535/sparkfun-obd-ii-uart 2024-11-30 https://elecena.pl/product/22725535/sparkfun-obd-ii-uart 2025-04-10 https://elecena.pl/product/22725535/sparkfun-obd-ii-uart 2025-11-28 https://elecena.pl/product/22725535/sparkfun-obd-ii-uart 2025-11-29