Interesting. It looks like an optical quadrature sensor.
Does the steering wheel have an end stop, or is it free to rotate?
My guess is that the little PCB drives two IR LEDs, and has two IR photodiodes. I'd suggest that the four wires are power, GND, quadrature A, and quadrature B. If you are lucky you can run it at 3.3V and connect A and B to Pi GPIO. Otherwise, you can use a level shifter of some kind. You can't connect a voltage greater than 3.3V to the GPIO pins.
It would probably be worth spending some time to make a schematic of the PCB then the solution will be obvious. Otherwise you can add your own quadrature sensor to the shaft and ignore the original one.
Does the steering wheel have an end stop, or is it free to rotate?
My guess is that the little PCB drives two IR LEDs, and has two IR photodiodes. I'd suggest that the four wires are power, GND, quadrature A, and quadrature B. If you are lucky you can run it at 3.3V and connect A and B to Pi GPIO. Otherwise, you can use a level shifter of some kind. You can't connect a voltage greater than 3.3V to the GPIO pins.
It would probably be worth spending some time to make a schematic of the PCB then the solution will be obvious. Otherwise you can add your own quadrature sensor to the shaft and ignore the original one.
Statistics: Posted by ame — Fri Feb 09, 2024 11:43 pm