DHT11 humidity and temperature sensor pinout

The DHT11 measures relative humidity and temperature and sends a 40-bit frame over a single data wire.

Four-position sensor interface

4 contacts Current package

Aosong / ASAIR ·

Four-position sensor interface

Front view with the vented face toward you and leads below. Pin 1 is at the left.

None · NC / reserved

No internal connection. Leave electrically open unless the package notes specify otherwise.

Aosong DHT11 Product Manual, pp. 3–5, mirrored by ManualsLib. This page uses that manual’s electrical revision.

Pin	Signal	Direction	Function
1	VDD Supply input	Supply input	Device supply. Place the bypass capacitor close to this pin.
2	DATA Bidirectional	Bidirectional	Aosong single-wire pulse timing interface. The host pulls the line low to request data, then releases it.
3	NC None	None	No internal connection. Leave electrically open unless the package notes specify otherwise.
4	GND Supply return	Supply return	Connect to the common ground plane or bench return.

The sensor replies with two humidity bytes, two temperature bytes, and an additive checksum.

Parameter	Limit	Conditions and source
Supply3.5–5.5 V	3.5–5.5 V	The example uses a shared 5 V logic and supply rail. Aosong DHT11 Product Manual, pp. 3–5, mirrored by ManualsLib. This page uses that manual’s electrical revision.
Host start pulseAt least 18 ms low	At least 18 ms low	Release the line afterward and measure the sensor’s response. Aosong DHT11 Product Manual, pp. 3–5, mirrored by ManualsLib. This page uses that manual’s electrical revision.
Sample intervalMore than 2 s	More than 2 s	Wait after power-up and leave time between requests. Aosong DHT11 Product Manual, pp. 3–5, mirrored by ManualsLib. This page uses that manual’s electrical revision.

The map applies to the four-pin bare DHT11 described in the linked manual. Three-pin breakout headers vary.

DHT11 manufacturer documentation· Aosong DHT11 Product Manual, pp. 3–5, mirrored by ManualsLib. This page uses that manual’s electrical revision.