CRJ 4-Pin Molex to 3 x 3-Pin PC Case Fan Sleeved Adapter Cable. FREE Shipping on orders over 25 shipped by Amazon. Fan pin out order Did Dell change its pinout order for the cpu fan header as it crossed from gen 4 to 5 i fried my 7040 fan and had a 9010 at work that was on its way out the door so i snagged the fan. All you need to control a 4-pin fan is 1 (or maybe 2) pullups of around 10kOhm. SATA to 3 Pin 4 Pin Fan Adapter,15pin SATA to 4 x 3 pin / 4 Pin 12V PC Case Fan Splitter Extension Power Cable Adapter-28cm-2pcs. If the PWM pin within you logic level, you're fine to go.Īlso, unlike mentioned in a comment, you don't need an ADC to read the tacho signal: it's a pulse signal (also open collector signal) that generates to drops to GND per revolution. Fan Pinout on all 4-pin fans that I have seen (now including this GPU blower) is as follows: Pin1 - Ground Pin2 - +12VDC Pin3 - RPM signal Pin4 - PWM There are two different color schemes though, apart from cosmetic wires where all the wires are the same color, I. There are many products on the market and to be absolutely sure if your individual fan is fine to work with in this way, you should connect PWM to ground through a large resistor (10kOhm) and measure the voltage at the PWM pin when the fan is connected to 12V and GND. I have never seen a case/CPU fan with +12vdc on pin 1. I don't agree with the other answers, which all mention to keep Vcc within the logic level of the Pi, which from my experience is not neccessary! Fan controllers in 4-pin fans have an open collector input for PWM control and thus are made to be controlled by typical logic levels, newer models of reputable brand are sometimes explicitly compatible with 3.3V logic using pullups to 3.3V, respectively.
You can typically simply connect the PWM input to a GPIO providing a 25kHz PWM signal.
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