This story was originally published on HackerNoon at: https://hackernoon.com/how-to-control-a-fan-to-cool-the-cpu-of-your-raspberrypi-3313b6e7f92c.
Following this tutorial you’ll be able to assemble a fan using a transistor to draw 5V current into the fan’s motor. Then you’ll write a Python script to activate the fan when the CPU reaches a certain temperature. Finally, you’ll be able to run the script automatically at boot time.
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