Digital temperature and humidity sensor. +/-0.5C accuracy, single-wire protocol.
| Pin | Name | Function | Type |
|---|---|---|---|
| 1 | VCC | Power supply, 3.3V to 5V | PWR |
| 2 | DATA | Single-wire data, needs 4.7k pull-up resistor | BUS |
| 3 | NC | Not connected | GND |
| 4 | GND | Ground | GND |
The DHT22 (AM2302) is a calibrated digital temperature and humidity sensor. It uses a single-wire digital interface, offers better accuracy and a wider range than the DHT11, and is popular in weather stations and HVAC automation projects.