DHT22 / AM2302 Digital Humidity and Temperature Sensor
Capacitive humidity and temperature sensor with a single-wire proprietary digital interface (NOT I2C). 3.3–5.5V supply. Accuracy: ±2% RH, ±0.5°C. Requires a 10kΩ pull-up on the DATA line.
Aliase:DHT22, AM2302, High Accuracy Humidity Temp Sensor
4-Pin Package (Front View)
4 Pins
Pinout Table4
| Pin | Signal / Name | Type | Alternative Functions |
|---|---|---|---|
| 1 | VDD | Power | Positive Power Supply (3.3–5.5V) |
| 2 | DATA | Digital | Single-Wire Data (proprietary protocol, requires 10kΩ pull-up to VDD) |
| 3 | NC | NC | No Connect — leave unconnected |
| 4 | GND | Ground | System Ground (0V) |