I recently tried to use this: http://arduinoprojects101.com/arduino-rpm-counter-tachometer/ But it doesn't seem to be working. I used the Infrared Emitter and Detector from Radioshack: [image] RadioShack.com Official Site - America's Technology Store The Shack Is Back! Shop Radios, He…

RPM Counter / Tachometer

system August 24, 2012, 12:08am 2

The radioshack components are a normal IR led and a normal IR transistor. So that should work.

Are you sure everything is connected as in the picture ?

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