> The old fashioned way would be a 4-20ma current loop. Other than
> power consumption, I cannot think of a simpler way.

I've used this with PICs in several noisy places, for both digital and
analogue remote signals

http://www.piclist.com/techref/microchip/aout.htm

The output current is converted back to a voltage at the distant PIC
with a resistor. I typically use 250 or 256 ohms for ADC applications,
depending on whether Vcc is 5V or 5.12V

Joe


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