“This intructable will teach you how to make very cheap Sky Control module (temperature and humidity controller). All the parts cost below 10$. The module is based on Arduino Uno. It uses a DHT22 sensor to measure temperature and humidity. The results are displayed on LCD Screen and pre-sets can be changed by using buttons. By using 2 relays you are able to connect any humidifier and heating element up to 2.5 kW. In this project devices connected to relays should have separate power source (even for 5V heating plate and humidifier that I’m using in my terrarium). In next project I will add Dust Sensor for controlling Air Pollution”