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I noticed that my Pi B3 got a little how while running so I got a little 5V fan. For that I needed a holder of some kind. But the fan was a little noisy, so I got a transistor to turn it off and on through the GPIO pins. While adding this to my mount I thought that status LED's would be nice.
The fan gives space for 3 LED (Green, Yellow, Red) and a transistor. With a little python script the temperature is read an and when then it turns on or of the leds and the fan depending on the temperature.
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FAN_016.stl | 314.7KB |