# OBD-II UART

**Type:** Product page · **SKU:** WIG-09555 · **Brand:** [Sparkfun](https://core-electronics.com.au/brands/sparkfun-australia)
**Page:** https://core-electronics.com.au/obd-ii-uart.html ([markdown](https://core-electronics.com.au/obd-ii-uart.html.md))

This board allows you to interface with your car’s OBD-II bus. It provides you 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 which mates directly to our FTDI Basic or a Bluetooth Mate. The DB9 connector mates with our DB9 to OBD-II cable listed below.

## Pricing

- **Price:** $104.95 (inc GST) — $95.41 AUD, exc GST
- **Quantity discounts:** 5+ $92.55 (exc GST) · 25+ $90.64 (exc GST) · 100+ $86.82 (exc GST)

## Availability & dispatch

- In stock, ships same business day if ordered before 2PM (Australia/Sydney).
- We can dispatch 1 today, and up to 11 more in 5–11 days.

## Description

This board allows you to interface with your car’s OBD-II bus. It provides you 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 which mates directly to our FTDI Basic or a Bluetooth Mate. The DB9 connector mates with our DB9 to OBD-II cable listed below.

[DB9 Serial RS232 OBD2 Cable](https://core-electronics.com.au/db9-serial-rs232-obd2-cable.html)

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.

**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

**Documents:**

- [Schematic](https://core-electronics.com.au/attachments/localcontent/OBD-II-UART-v13_62556051de4.pdf)
- [Eagle Files](https://core-electronics.com.au/attachments/localcontent/OBD-II-UART-v13_70542e5e531.zip)
- Hookup Guide
- [OBD=II Guide](https://learn.sparkfun.com/tutorials/getting-started-with-obd-ii)
- [Datasheet](https://core-electronics.com.au/attachments/localcontent/stn1110-ds_62057a40bb7.pdf) (STN1110)
- [Datasheet ](https://core-electronics.com.au/attachments/localcontent/MCP2551_35217f48ea6.pdf)(MCP2551)
- [Datasheet](https://core-electronics.com.au/attachments/localcontent/ELM327DS_3968655bb61.pdf) (ELM327)
- [ELM327 Command Set](https://core-electronics.com.au/attachments/localcontent/ELM327_AT_Commands_456204de4a2.pdf)
- Compatible Software List
- [GitHub Repo](https://github.com/sparkfun/OBD-II_UART)

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/o/b/obd-ii_uart__wig-09555__01.jpg)