DHT22 temperature-humidity sensor
Single-wire capacitive humidity and thermistor temperature sensor outputting calibrated digital data. Readings update at most once every 2 seconds; not Dallas 1-Wire compatible — each sensor needs its own data pin.
Pinout
- VCC4-pin DHT body / wired lead
Power input; pin 1 from left on bare sensor, red wire on wired sensor
Type · PowerVoltage · 3.3-5V - DATA4-pin DHT body / wired lead
Single-wire digital data output; pin 2, white or yellow wire
Type · SignalVoltage · 3-5V logic - NC4-pin DHT body
Not connected; ignore pin 3 on 4-pin DHT body
Type · Control - GND4-pin DHT body / wired lead
Ground; pin 4 from left on bare sensor, black wire on wired sensor
Type · GroundVoltage · 0V
| Pin | Position | Type | Function | Voltage |
|---|---|---|---|---|
| VCC | 4-pin DHT body / wired lead | Power | Power input; pin 1 from left on bare sensor, red wire on wired sensor | 3.3-5V |
| DATA | 4-pin DHT body / wired lead | Signal | Single-wire digital data output; pin 2, white or yellow wire | 3-5V logic |
| NC | 4-pin DHT body | Control | Not connected; ignore pin 3 on 4-pin DHT body | |
| GND | 4-pin DHT body / wired lead | Ground | Ground; pin 4 from left on bare sensor, black wire on wired sensor | 0V |
Pin details
4 connections- VCC4-pin DHT body / wired lead
Power input; pin 1 from left on bare sensor, red wire on wired sensor
PowerVoltage · 3.3-5V - DATA4-pin DHT body / wired lead
Single-wire digital data output; pin 2, white or yellow wire
SignalVoltage · 3-5V logic - NC4-pin DHT body
Not connected; ignore pin 3 on 4-pin DHT body
Control - GND4-pin DHT body / wired lead
Ground; pin 4 from left on bare sensor, black wire on wired sensor
GroundVoltage · 0V
Start wiring
I2C · SPI · Single data line · 3.3 – 5 V · Breakout
Verify supply voltage and logic levels before powering up.
Module pins: VCC, GND, DATA. Schematik maps them to your board in the app.
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