DHT22 Temperature and Humidity Sensor

DHT22 Temperature and Humidity Sensor info

DHT22 Temperature and Humidity Sensor is an output calibrated digital signal. It applies exclusive digital-signal-collecting-technique and humidity sensing technology, assuring its reliability and stability. Its sensing element 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 program in OTP memory. When the sensor is detecting, it will cite coefficient from memory.

DHT22 Temperature and Humidity Sensor - General Specifications

• High precision
• Capacitive type
• Full range temperature compensated
• Relative humidity and temperature measurement
• Calibrated digital signal
• Outstanding long-term stability
• Extra components not needed
• Long transmission distance, up to 100 meters
• Low power consumption

DHT22 Temperature and Humidity Sensor - Technical Specifications

• 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
• 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

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DHT22 Datasheet