DHT22 AM2302 Digital Temperature And Humidity Sensor

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DHT22 digital temperature and humidity sensor is a calibrated digital signal output temperature and humidity combined sensor


Use with Arduino

Hardware connection

Sensor Arduino Description
VCC 5V Power input
GMD GND Power ground
DOUT D2 Digital data output

Arduino Library

In stock


This is a calibrated digital temperature and humidity module with onboard sensor DHT22 (AM2302), which features higher accuracy and a wider measuring range than DHT11.

It can be used for detecting ambient temperature and humidity, through the standard single-wire interface.

  • Sensor: DHT22
  • Temperature
    • Resolution : 0.1°C
    • Accuracy : ±0.5℃
    • Measuring range : -40°C ~ 80°C
  • Humidity
    • Resolution : 0.1%RH
    • Accuracy : ±2%RH (25°C)
    • Measuring range : 0%RH ~ 99.9%RH
  • Operating voltage : 3.3V ~ 5.5 V
  • Recommended storage condition
    • Temperature : 10°C ~40°C
    • Humidity : 60%RH or below
  • ere are the pin definitions.
    Pin Symbol Descriptions
    1 VCC Power supply (3.3V-5.5V)
    2 GND Ground
    3 DOUT Data output, connected to the pin SDA of AM2302

    The AM2302 uses the simplified single-bus technology for communication, in which only one data line is applied for data exchange and data control in the system. In applications, an external pull-up resistor, about 5.1kΩ, is usually required. When the bus is idle, its status will switch to HIGH. The SDA is used for the data communication and synchronization between the microprocessor and the AM2302. It adopts a single-bus data format, 40 bits of data in one transmission, high bit first out. The corresponding timing diagram is shown below.