DHT22 (also known as AM2302) outputs a calibrated digital signal. It utilizes exclusive digital-signal-collecting-technique and humidity sensing technology, assuring its reliability and stability. Its sensing elements are connected with 8-bit single-chip computer.

Every sensor of this model is temperature compensated and calibrated in an 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 in size low power consumption long transmission distance (20m) enable DHT22 to be suited for all kinds of harsh application situations.
Single-row packaged with four pins, making the connection very convenient.

Feature Application:

* 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

Specifications:

* Power supply: 3.3-5.5V DC
* Output signal: digital signal via single-bus
* Sensing element: Polymer capacitor
* Operating range: humidity 0-100%RH / temperature -40~80 Celsius
* Accuracy: humidity +-2%RH(Max +-5%RH)/ temperature +-0.5Celsius
* Resolution or sensitivity: humidity 0.1%RH / temperature 0.1Celsius
* Repeatability: humidity +-1%RH / temperature +-0.2Celsius
* Humidity hysteresis: +-0.3%RH
* Long-term Stability: +-0.5%RH/year
* Sensing period: Average-2s
* Interchangeability: fully interchangeable
* Dimensions: small size 14*18*5.5mm