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Very Very Simple Thermal Fan Controller

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Good evening folks, very new to the electronics game. I've decided to create a Mac Mini acrylic rack mount with integrated fans controlled by a temperature sensor.

This is my plan, use a 5v from the USB to power the fan and have a thermal switch in the middle to start it up when it meets the thermal sensor temperature then cut out when it goes below that temperature. I understand using a thermostat would give me variable control but I'm after a really simple design.

I've found these

They're not the temp I want but would they work to simply wire them between fan and power? I'm after a 30c switch really

Thanks in advance

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