I'm looking to build a circuit to convert an old steering wheel remote to a newer head unit. Both work with resistances, but have different values each.
So, what I would need to build is a circuit that, given an input resistance value, outputs another resistance value.
I don't have much experience with advanced electronics, so what I'm looking to know is whether and how this could be made with more simple electronics (resistors, transistors and so on) or if I'd need to use things like micro-controllers (for which I don't have any experience at all).
Could you give me some orientation in this matter? Thanks!
Edit: The steering wheel provides input with 2 wires. Pressing a switch closes the circuit with a determined resistance value. The head unit / output circuit expects this kind of behaviour, albeit with different values. There are adapters, but not for my specific remote.
Best Answer
Other solution: use a digitally controlled potentiometer. This is a lot easier than the FET solution in my other answer, but you have very limited current.
Again, measure the sensing resistor with a voltage divider and a microcontroller's ADC. Calculate the resistance from the voltage and set the digital potentiometer's resistance accordingly.