Fanatec handbrake wiring for DIY?
TL/DR: Inconsistent behavior (doesn't work at all anymore) with my DIY hall sensor handbrake on GT DD Pro. How is the Fanatec handbrake wired?
So, I didn't find an analogue handbrake in a tabletop format, so I decided to make my own with a hall sensor. After a few calibrations it worked great until I shut down the wheel and continued later. The calibration was badly off, and I only got it to work by unplugging the handbrake and restarting the Fanatec base a few times. I still had to adjust the deadspot in EA WRC, but after that it worked well... until I shut down the system again.
Now it doesn't work at all anymore. At launch the Fanatec software shows no handbrake input, and when I pull the handle, it jumps to max. This is normal to the self calibration process. But when releasing the handbrake the meter stays at 100%. Unplugging the handbrake and plugging back in still shows 100%.
Tevhnical: The base puts out a healthy 5.2V to the handbrake connector, and the way that hall sensors work it gives out half of that without a magnet nearby. I thought that the base might expect a potentiometer version, so I lowered the output voltage with two diodes and connected 15kohm resistors across the terminals. Output at rest was now at 1.7V, increasing to around 2.7V when hb was engaged in full. But none of this helped.
Has anyone opened up the Fanatec handbrake and checked the electronics? What exactly is there and how is it connected?