Re: Control electronics
@Poor Coco, even digital signals over long wires suffer from signal degradation. This is mostly due to voltage drop over the wire due to resistance but also the wire capacitance.
Voltage drop along the length of the wire comes from V=I*R, and while the resistance may be several ohms (in case of lousy wire and contacts), current (into the controller input) doesn't have to exceed 0.1mA, so your voltage loss from that bit is negligible.
Signal shape is affected by the wire's capacitance, which will be in the order of 100pF for a meter of shielded signal wire like RG316. Current digital logic is well able to deal with that kind of load, and there's always the option to go for an interface driver that uses I2C (availabe on most microcontrollers), which has been developed for use in automotive environments.