Ok, I think we are looking at a "peak and hold" setup here.
The lowest line is the peak (0 volts), the middle line is the hold. The upper line is 12 volts, right?
I think you *might* be able to add a 20k or so potentiometer (ahead of the guino injector resistor) and set it up so that middle line is below 2.3 volts on the mpguino and the upper line is above 2.5 (or do some figuring and use resistors).
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WINDMILLS DO NOT WORK THAT WAY!!!
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