wbh-diag 0.89 : seem to work (unstable connection).My Audi A4/B5 (1997) and many other old cars use the older OBD KW 1281 protocol – I tried to find any suitable OBD software for my car to speak to my motor and dashboard control units ( ECU), however: Arduino code was written for the KW1281 protocol to read car sensor data (RPM, oil/coolant temperature, throttle, air, etc.) and show them on the display.ĭownload Arduino Code for the KW1281 OBD protocol: arduino_kw1281.An Arduino LCD display (‘YwRobot LCMI602 IIC V1’) was attached to the Arduino.An OBD USB adapter (USB KKL adapter ‘ AutoDia K409 Profi USB‘) was hacked, so I could connect the car OBD to the Arduino (TX/RX via software serial).Update 2015: I developed an Arduino OBD reader for the older OBD KW1281 protocol:
