DHT22 temperature and humidity sensor

Description

The DHT22 is a temperature (from -40°C to +80°C) and relative humidity (from 0% to 100%) sensor. It features a single-wire serial interface that makes it easy to use. The DHT22 sensor is calibrated with extreme precision; the calibration coefficients are stored in OTP memory and are recalled during the detection process, so there is no need to recalibrate the sensor. It is particularly suitable for consumer products, weather stations, HVAC applications (Heating, Ventilation and Air Conditioning), etc.

Technical Specifications

• Data output: single-wire serial (not compatible with Dallas One Wire)
• – 1 VCC
  – 2 DATA
  – 3 Not used
  – 4 GND

Documentation and useful links

• Schematics and code
• Library