The DHT22 ( RHT03 ) is a basic, low-cost digital temperature and humidity sensor. It uses a capacitive humidity sensor and a thermistor to measure the surrounding air, and spits out a digital signal on the data pin (no analog input pins needed). Its fairly simple to use, but requires careful timing to grab data. Read more about DHT22 Digital Temperature and Humidity Sensor; Temperature and Humidity Module AM2302[…]