DHT22 Temperature and Humidity Sensor

The DHT22 temperature and humidity sensor uses a thermistor to measure temperature and capacitive humidity sensor to measure humidity. It has a single wire digital interface.

Specifications

• Supply Voltage: 3.3 to 6V
  
• Output Signal: digital signal via single-bus
  
• Operating Range and Accuracy (Humidity): 0-100% RH; +/-2% RH
  
• Operating Range and Accuracy (Temperature): -40 to 80 C; +/-0.5 C
  
• Average Sending Period: 2 seconds
  
• Dimensions (excluding pins): 15.3mm (0.6") length x 7.8mm (0.3") width x 25.3mm (1.0") height

Resource Links

• DHT22 (AM2302) Datasheet
  
• DHT11 Arduino Library (Arduino Playground)