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I want to build a smart air conditioner with my Raspberry Pi 3b+ by using these PC Fans: https://www.amazon.de/Arctic-F12-PWM-PST-Geh%C3%A4usel%C3%BCfter/dp/B00NTUJTAK/ref=cm_wl_huc_item.

What is required to control these fans using the GPIO pins?

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  • you are asking your question at the wrong time .... your first question should be what control signal do these fans require? .... when you know the answer, then ask your question
    – jsotola
    Jun 9, 2019 at 15:27

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You need no external circuitry to control it, just a 12V power supply. You then connect the fan's pwm input to your gpio which has to generate a PWM at 25kHz (intel standard for pc fans). Keep common ground between the fan and the raspberry.

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