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Author Topic: Help with RPM code  (Read 3541 times)
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Any clues?
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Did you check to see what the voltage at that point is in each state?
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Yes I did get one of the 3 wire fans yesterday to test the code and it worked fine, got about 2400rpm.  I also built a new IR rpm sensor instead of using the photo-interrupter, It still gave me wrong numbers.

Here is the circuit I used:


I have seen other people make these circuits so why is not working for me. What is wrong?

THAT diagram is correct (finally!)  smiley

Have you looked at the signal with an oscilloscope? Maybe you are getting 120 hz "interference" from fluorescent lighting.

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