DHT22 Digital Temperature and Humidity Sensor 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. The only real downside of this sensor is you can only get new data from it once every 2 seconds, so sensor readings can be up to 2 seconds old. Simply connect the first pin on the left to 3-5V power, the second pin to your data input pin and the rightmost pin to ground.
FEATURES:
1.Ultra-Low Power.
2.No Additional Components.
3.Long-Distance Signal Transmission.
4.All Calibration, Digital Output & Completely Interchangeable.
5.Relative Humidity & Temperature Measurement.
6.Humidity Measurement Precision: 2-5% RH.
7.Temperature Measurement Precision: 0.5 deg C.