Working on a circuit to control a refrigeration compressor speed. The speed is set by a resistor in the thermostat circuit that can range from 0 to 1.6K in a logarythmic progression. I have no documentation on exactly how the compressor's controller works but it looks like a basic RC network. Can't find a digital pot that would work so I need to find a way to switch 6 different resistors into the circuit from the output pins of a PUC uC without effecting the circuit in any other way.
Any suggestions?