Base for Raspberry Pi
thingiverse
A simple base for a Raspberry Pi3/4 computer. Has a spot for a 5V 25mm x 10mm cooling fan. The design also includes spacers for use with a Pi proto hat. If a hat is used 3/4" 2-56 mounting bolts should be used. For just the Pi, 1/4" will work. They screw into the mounting posts, which should be tapped. The fan can be powered right from the 5V pin, or controlled by a 2N2222 transistor using a GPIO pin. The standard Pi OS has a dt overlay for this. Just add the following to /boot/config.txt: dtoverlay=gpio-fan,gpiopin=12,temp=52000 Any GPIO pin can be used, 12 is default Temp is in millideg C, default is 55000 There is a 10deg C hysterisis for the fan to go off Pin will be active high. Use a 680ohm resistor from the GPIO to the base of the 2N2222.
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