Disassemble your ELM327 cable by removing the sticker and the four screws on the enclosure. Carefully remove the circuit board. Mark one side of the OBD2 connector with a marker to ensure correct reassembly, although this step isn’t crucial for this particular Obd2 Hack.
Solder two wires to the TX and RX pins on the ELM327 board. Refer to the included pin-out diagram of the USB bridge chip for precise locations. Exercise caution during soldering to avoid damaging components.
To identify the TX pin, program your Arduino to send data to the serial monitor with short delays. Connect a jumper cable to the Arduino’s TX pin and probe the ELM327 board. Observe the surface-mounted LEDs; flickering indicates communication. The RX pin location is visually identifiable in the accompanying images.
For this obd2 hack, power the ELM327 solely via the PC’s USB port while preventing PC communication. Cut the middle two wires of the 4-pin USB connector to isolate the ELM327’s serial controller, enabling the Arduino to communicate without interference.
Reassemble the ELM327 board into its enclosure. Secure it with tape if necessary for practical application in a vehicle. This obd2 hack allows for custom applications by utilizing the ELM327 with an Arduino.
