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Author Topic: Controling a 9v supplied CMOS with Arduino's 5v  (Read 1761 times)
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CrossRoads
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« Reply #15 on: February 02, 2011, 08:52:57 pm »
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Well,
The pins are comparable to say 20K resistors. The 100K resistor will limit the current from the 9V source to 0.09mA, so the output would be like 1.8, so that could be okay.
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« Reply #16 on: February 02, 2011, 10:06:41 pm »
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OK this is almost working......but I'm only getting 5.5v at the gate? I guess the 100k  pullup resistor is to big? How low can I make the pullup resistor to get more voltage but not harm the Arduino pin?

Soooooooooooooo close!
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