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The DHT22 (AM2302) Temperature and Humidity Sensor

The DHT22 is a low-cost ($2) digital temperature and humidity sensor. It uses a capacitive humidity sensor and a thermistor to measure the surrounding air, and transmits a digital signal on the data pin.

These devices are easy to use since they have an internal analog to digital conversion. They are good for 20-80% humidity readings with 5% accuracy and 0-50°C temperature readings with ±2°C accuracy. They are designed to be polled about once every two seconds.


DHT22 or AM2302 Temperature and Humidity Sensor


DHT22 Datasheet (PDF)