Using a DHT22 sensor, an Arduino, and a relay, turns a humidifier on and off based on current humidity. I programmed this for the Arduino Uno, though as far as I know there's no reason it couldn't ...

an arduino based project to automatically control heaters, heat lamp, UV light, and humidifier with built in native web interface 1.) the arduino system is composed of the following: Arduino Mega 2560 ...