Uploaded June 2020 | Updated September 2026, 5 hours ago

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Find Science Fun Innovations, LLC on Facebook @sciencefun4u.

In this tutorial I will show 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.

The Arduino source files are available here: sciencefuninnovation.gumroad.com . Your donations will help me to continue to produce educational and entertaining videos. Thanks for your support!

Need a 4-wire fan? Get one here: amzn.to/3YvmlZI
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