OBD Development Board

As shipped, the OBD Development Board is a fully functioning OBD-II to USB interface that supports all OBD-II protocols and works with any ELM327-compatible software.

The OBD Development Board features UART and USB interfaces, an OBD breakout with access to all all 16 J1962 (OBD port) pins, three module slots with breakout headers, and a number of configuration jumpers and test points. Full details are available in the ‘Schematics’ section below.

The unique modular design offers considerable flexibility, allowing engineers to quickly evaluate, prototype, and verify the major circuit blocks.

FeaturesDevelopment boards 3/4 view

  • Modular design
    • Interconnect Board
    • STN Breakout Module
    • OBD Driver Module
    • Power Module
  • Support for all legislated OBD-II protocols:
    • SAE J1850 PWM
    • SAE J1850 VPW
    • ISO 9141-2
    • ISO 14230-4 (KWP2000)
    • ISO 15765-4 (CAN 250/500 kbps, 11/29 bit)
  • Support for non-legislated OBD protocols:
    • ISO 11898 (raw CAN)
    • SAE J1939 (cable not supplied – does not support 24 Volts)
    • Single Wire CAN (SW-CAN) – GM proprietary network
    • Medium Speed CAN (MS-CAN) – Ford proprietary network
  • ELM327-compatible command set
  • Breakout headers for all module pins
  • UART and USB interfaces (FT232RL/Virtual COM Port)Order Now
  • 16-pin OBD breakout header
  • Test points for measuring voltage
  • Tap points for measuring current
  • Configurable sleep/wakeup functionality
  • Can be powered from OBD Port (12 Volts), or the optional 12VDC power supply

Connection Diagram

Development Board Connection Diagram

Shown with optional ECUsim 2000 and laptop (not included). For more information see the Lab Manual.

User Interface Diagram

Development Board Diagram


OBD Interconnect Development Board Rev G
OBD Interconnect Development Board Rev F
STN2120 Breakout Module
STN2100 Breakout Module
STN1170 Breakout Module

OBD Driver Module
Power Module


USB Drivers (Virtual COM port)


Microchip MASTERs slides (“Interfacing with Vehicle Networks: Best Practices”)
Microchip MASTERs lab manual