Currently I`m working on the Retarder Handle. Its a complicated piece because its a so called "Hall Effect Device" and it requires custom Arduino Code to make it work.

Hall Effect Devices output a specific voltage so the computer knows something changed. All Lever Positions have a specific ohms Resistance so we are going to measure the handles resistance with the Leonardo, store it in the Arduino`s memory and (Keyboard.print("a"); when the lever goes UP or we (Keyboard.print("b"); when the Lever goes DOWN.

I made this little board with the screw terminal on the bottom. Its not a nice piece I know, but it does the job. We will need this board in later steps for Part 2 of the ACC/EDC (cruise control) log as well.


I found This Online Tutorial. It tells you how to build an ohm meter with Arduino. I will post the modified Arduino Code for ETS2 in the next step (Retarder part 2).

For now I need to keep testing and looking for code, I will keep you posted!