There are many Humidity sensors available. DHT-11/DHT-20/DHT-22 from Aosong are the cheapest and easily available in India. DHT-11 is the cheapest. DHT-22 or AM2302 is a good choice for hobby purposes or college projects. DHT20 has replaced DHT22 but still DHT22 is still the most available one. DHT20 is colored black and DHT22 is white.… Continue reading Humidity sensor