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Arduwbl - Arduino based Trionic7 canbus reader that turns on a relay when the engine is running

By listening in to the periodic canbus messages from the Trionic7 ECU, this Arduino based device can turn on a relay when the engine is running. This can be used to power a wideband lambda or other devices that should only be powered when the engine is running.

Hardware

  • Arduino Nano
  • MCP2515 CAN bus module
  • 5V Relay board
  • DC-DC Step-down converter (12V to 5V)

prototype assembled in car

MCP2515 wiring

mcp wiring

INT -> 2
SCK -> 13
SI -> 11
SO -> 12
CS -> 10 
GND -> GND
VCC -> 5V

Relay board

IN -> 5
DC+ -> 5V
DC- -> GND

CAN bus

0x280 - Engine is running status 0x5C0 - Engine temperature