DHT22/AM2302 Digital Temperature and Humidity Sensor


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6,500 Ks

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Detail about DHT22

DHT22 output calibrated digital signal. It utilizes exclusive digital-signal-collecting-technique and humidity sensing technology, assuring its reliability and stability.Its sensing elements is connected with 8-bit single-chip computer.Every sensor of this model is temperature compensated and calibrated in accurate calibration chamber and the calibration-coefficient is saved in type of programme in OTP memory, when the sensor is detecting, it will cite coefficient from memory.Small size & low consumption & long transmission distance(20m) enable DHT22 to be suited in all kinds of harsh application occasions.Single-row packaged with four pins, making the connection very convenient.


  • Full range temperature compensated
  • Relative humidity and temperature measurement
  • Calibrated digital signal 
  • Outstanding long-term stability 
  • Extra components not needed
  • Long transmission distance 
  • Low power consumption 
  • 4 pins packaged and fully interchangeable




Power supply

3.3-6V DC

Output signal

digital signal via single-bus

Sensing element

Polymer capacitor

Operating range

humidity 0-100%RH; temperature -40~80Celsius


humidity +-2%RH(Max +-5%RH); temperature <+-0.5Celsius 

Resolution or sensitivity 

humidity 0.1%RH; temperature 0.1Celsius


humidity +-1%RH; temperature +-0.2Celsius

Humidity hysteresis


Long-term Stability


Sensing period

Average: 2s


fully interchangeable


small size 14*18*5.5mm; big size 22*28*5mm


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DHT22/AM2302 Digital Temperature and Humidity Sensor

DHT22/AM2302 Digital Temperature and Humidity Sensor

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