A clear, detailed image of the DHT22 digital temperature and humidity sensor, showing its compact form and electronic components.

Guangzhou Aosong Electronic AM2302 (DHT22)

The DHT22 is a rudimentary, economical digital sensor, designed for measuring temperature and humidity. The device operates utilizing a capacitive humidity sensor and a thermistor to gauge the immediate environment, outputting a digital signal on the data pin. Notably, the DHT22 is superior in precision, accuracy, and operational range compared to the DHT11, albeit at a larger size and higher cost. The sensor requires 3 to 5V power and I/O, utilizing a maximum of 2.5mA current during data conversion. It is capable of 0-100% humidity readings with 2-5% accuracy, and -40 to 80 °C temperature readings with ±0.5 °C accuracy.

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