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controlling 12v motor and converting signal to 5v to read in arduino

put a diode to prevent voltage from going back and only flow in one way
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Controlling a 12V 2 pin fan using PWM

From what I could find with that product description of the fan, I don't think, that you even can control it via PWM. It has a brushless motor (like most of these small DC fans), which means, that the ...
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Arduino nano timing precision

The Arduino Nano is nowhere accurate enough for your application, and this has nothing to do with your code: it is a hardware limitation. 360 extra milliseconds after 2,700 seconds is a difference of ...
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