• on Test & Measurement
  • Published in issue 4/2011 on page 30
About the article

Wireless OBD-II

Car diagnostics interface with Bluetooth or ZigBee

Wireless OBD-II

The cheapest way to diagnose faults on a modern car is to connect its OBD-II interface to a (notebook) PC running suitable diagnostics software. However, a wired connection is not always the most suitable, and self-contained OBD testers are a rather expensive and less flexible alternative to using a PC. An interesting option is a wireless OBD interface with a radio interface to a PC: the homebrew solution described here allows the choice of using either Bluetooth or ZigBee.

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Features

- compact size, fits inside an OBD-II plug
- integrated DXM module
- automatic protocol scan
- PWM, VPWM, ISO9141, KWP2000 and CAN interface standards
- software compatible with ‘moDiag’ and ‘OBD-DIAG’
- suitable for use with all OBD-II-equipped cars
Bluetooth version
- compatible with Windows XP, Windows Vista and Windows 7
- Class 1 Bluetooth module with maximum range of 100 m
ZigBee version
- Cortex M3 and Atmel AT90USB162 host microcontroller
- Windows driver using INF file
- Frequency range 2405 MHz to 2480 MHz with automatic channel selection
- Receiver sensitivity –101 dBm
- IEEE 802.15.4-2003 (ZigBee-like protocol)
- automatic retry on failed transmission
- range approximately 10 m to 15 m (maximum approximately 30 m to 40 m)
- ZigBee USB stick compatible with Windows XP, Windows Vista and Windows 7

 

Correction

issued: March 31, 2011.

The BTM-222 module used in the project is a Class-1 Bluetooth device, not Class-3 as mentioned in the article.


 

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