As far as I can tell, the sense pin is supposed to output a value for the fan speed. The specs say it is a tachometer output signal with 2 pulses per revolution. If I just plug the wire straight into an analog pin, I get values around 330, but I have no idea what that is measuring (pulses maybe?). Most of the other posts have tried to use interrupts to somehow convert pulses to RPMs, but I have been unsuccessful with them.
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