DHT22 (AM2302) – Humidity and Temperature Sensor is a low cost humidity and temperature sensor with a single wire digital interface. The sensor is calibrated and doesn't require extra components so you can get right to measuring relative humidity and temperature.

Features:

• 3.3-5V Input
  
• 1-1.5mA measuring current
  
• 40-50 uA standby current
  
• Humidity from 0-100% RH
  
• -20 - 80 degrees C temperature range
  
• +-2% RH accuracy
  
• +-0.5 degrees C
  
• Pin Mapping (When the Sensor is kept facing you, left most pin is Pin 1)
  
• VDD power supply (3.5-5.5V)
  
• SDA serial data - bidirectional 
  
• NC NC
  
• GND

Datasheet:

        https://www.adafruit.com/datasheets/Digital%20humidity%20and%20temperature%20sensor%20AM2302.pdf