DHT22 Humidity and Temperature Sensor

The DHT22 is a basic, low-cost digital temperature and humidity sensor.

It uses a capacitive humidity sensor and a thermistor to measure the surrounding air, and spits out a digital signal on the data pin (no analog input pins needed).Simply connect the first pin on the left to 3-5V power, the second pin to your data input pin and the right most pin to ground. Although it uses a single-wire to send data it is not Dallas One Wire compatible! If you want multiple sensors, each one must have its own data pin.

Compared to the DHT11, this sensor is more precise, more accurate and works in a bigger range of temperature/humidity, but its larger and more expensive.

Comes with a 4.7K - 10K resistor, which you will want to use as a pullup from the data pin to VCC.

DHT22 also referred to as AM2302 capacitive humidity sensing digital temperature and humidity module is one that contains the compound that has been calibrated digital signal output of the temperature and humidity sensors. Application of a fanatical digital modules collection technology and therefore the temperature and humidity sensing technology, to make sure that the merchandise has high reliability and excellent long-term stability.