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In a previous tutorial, I showed you how to control 2-wire, 3-wire, and 4-wire CPU fans using an Arduino. With 2-wire fans and 3-wire fans, speed control is possible using an N-channel MOSFET and PWM. With 3-wire fans and 4-wire fans, it is possible to measure the fan speed using an Arduino input and a pull-up resistor. With 4-wire fans, speed control is possible directly with a PWM Arduino channel without the use of a transistor or MOSFET.
However, some CPU fans require high frequency (25kHz) PWM in order to function properly. In this video I will demonstrate how to control a 4-wire CPU fan using 25 kHz PWM on the Arduino
