The actual RPM is 5580 according to the tachometer. When I push the duty cycle to 100%, the reading flickers between 50. On occasion it jumps up to 2700 - 3000 which seems to be double what the previous reading was - more or less. However, the readout from the Arduino tends to jump up and down about 50 RPM when at 1400 RPM (just as an example). I checked the actual PRMs with a tachometer and it is about 20 to 30 rpm from the readings given by the Arduino and it is stable. The PWM control part works fine, but the RPM readout is a bit erratic. I merged the code for the PWM control and the RPM measurement together. How to properly control PWM fans with Arduino - Federico Dossena () I found some code, that I fail to understand, on Ferederico Dossena's site linked below. I have a very powerful 12V PWM fan that I would like to control with an Arduino Nano.
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