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Topic: Help with RPM code (Read 8580 times) previous topic - next topic



Did you check to see what the voltage at that point is in each state?


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!)  :)

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

Gentlemen may prefer Blondes, but Real Men prefer Redheads!


i have a same problems, did this problem had been solved? thanks

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