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rpi4 psu notes

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I just bought a case with fa , as pi 4 is not working great without it. Now temperature is low, but as I have it in my room, I would like to turn it off while sleeping.

My fan is: https://www.amazon.fr/gp/product/B07V9Q95RX/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

When I shutdown the pi, fan is still active, so I have to physically unplug power, which is not so great.

Is there a way to shutdown fan at the same time than pi ?

  • Hi @Juliatzin del Toro, Ah, let me see. If there is no power on/off switch on the power cord, perhaps you can DIY one: Rpi4B Case with Fan, 4 Heatsinks, 5V 3A USB-C PSU – US$17 – amazon.com/Smraza-Raspberry-Cooling-Heatsinks-Included/dp/… – (With a handy on/off switch on the 59 inches cable, easily press button to power on RPi4B) – tlfong01 2 hours ago    
  • Without knowing what case and how the fan is connected – No – Milliways 1 hour ago
  • This is the switch you can DIY: imgur.com/a/7GcpXDI. – tlfong01 1 hour ago   
  • @Milliways sorry I updated my question with fan link – Juliatzin del Toro 58 mins ago
  • And you can use this kind of switches: imgur.com/gallery/R0j5Ac9. These are 250V AC 3A ~ 5A switches. Your Rpi4 5.1V ~ 5.3V DC 3A wall wart output has a micro USB connector. So I would suggest (no guarantee nothing won’t melt down!) to “insert” the switch between wall wart and micro USB connector. – tlfong01 43 mins ago    
  • Now the time has come for the cut operation. First thing first is to cut the wall wart to micro USB connector power cord into two halves (sorry, unplug the wall wart first!). And before the cut, you need to think twice that if the two “halves” are really halves, or one long half and one short half, say, one quarter and three quarters. Now you strip the ground wire and 5V wire, IN DIFFERENT LENGTHS. This important for newbies, who always short the red wire with the blue wire and cause explosion. If red is shorter than blue, then the newbie can live longer: imgur.com/K2UOQGj – tlfong01 3 mins ago    Edit   

1

If the fan is connected to the 5V and GND pins then they are not controlled by software. Those two pins are directly connected to your power supply, so as long as the power supply is connected and turned on at the wall socket your fan will continue to run.

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