Fan power and control based on CPU temp

Help with Raspberry Pi Foundation Boards (Raspberry Pi, Pi Zero, Pi Zero W, Pi A, Pi B, Pi B+, Pi2 B, Pi3 B, Pi 3 B+)
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KB8AOB
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Joined: Tue May 08, 2018 3:42 am
Location: Buckhannon WV USA

Fan power and control based on CPU temp

Post by KB8AOB » Tue May 08, 2018 10:15 pm

"Out of box" idea - Have pi-star control a small 5v fan to assist with cooling the system via POE pins on 3B+ and/or screen connections on radio board based on "color" temperature. Green off; Yellow slow; Red full speed.

MW0MWZ
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Re: Fan power and control based on CPU temp

Post by MW0MWZ » Tue May 08, 2018 11:00 pm

there are a couple of PWM scripts that will switch a transistor to run a fan at variable speed, that kind of thing should work well.
Andy

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G3SNA
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Joined: Wed Apr 11, 2018 7:21 pm

Re: Fan power and control based on CPU temp

Post by G3SNA » Wed May 23, 2018 6:55 pm

The RPi3 is an System on Chip device with thermal trottle which reduces CPU clock speed if necessary to limit the temperature at 80 degC. My RPi3 pi-star system runs at about 55 degC with a 22 degC ambient in a standard raspberry pi box so I don't see the point of heatsinks.

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