Go Down

Topic: Help with RPM code (Read 3 times) previous topic - next topic

Caadi


SAButter

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

Krupski



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!

Go Up