Electronics Projects
Temperature-Controlled Fan
A fan that speeds up as the temperature rises.
Overview
A DHT22 measures temperature and a MOSFET drives a fan with PWM, with a flyback diode for protection.
Build Steps
Wire the sensor
Connect the DHT22 to a digital pin.
Wire the MOSFET
Fan negative to the MOSFET drain, source to ground, gate to a PWM pin through a resistor.
Map temperature to speed
Scale PWM duty between a low and high temperature.
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