DHT22 Digital Temperature and Humidity Sensor-Standard Quality

DHT22 Digital Temperature and Humidity Sensor-Standard Quality

The DHT22 Digital Temperature and Humidity Sensor (Standard Quality) is an affordable, easy-to-use sensor that measures both temperature and humidity. It utilizes a capacitive humidity sensor and a thermistor to detect environmental conditions, outputting a digital signal on the data pin—no need for analog input.

While the sensor is straightforward to use, it requires careful timing to read the data. One limitation is that you can only retrieve new data every 2 seconds, meaning sensor readings may be up to 2 seconds old when using the provided library.

To use the DHT22, simply connect the leftmost pin to a 3-5V power source, the middle pin to your data input, and the rightmost pin to ground. Although it sends data via a single-wire connection, it is not compatible with Dallas One Wire protocol. If you plan to use multiple sensors, each one must have its own dedicated data pin.