DHT11 humidity and temperature sensor connection guide

DHT11 humidity and temperature sensor Four-position sensor interface wiring guide with power, signal assignments, and bench checks.

Four-position sensor interface

4 contacts Current package

Aosong / ASAIR ·

Required

Use a short cable and a 5 V host with a GPIO that can switch between driving low and high impedance. Pull the data wire up to the same 5 V supply.

Wait more than two seconds after power-up. Pull the data line low for the documented start time. Then release the line and look for the sensor response.
Check that the low eight bits of the sum of the first four bytes equal the fifth byte before decoding.
Decode the separate integer and fractional fields according to the manual for the specific device revision.

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

Highlighted contacts are used in the required step or selected circuit. Select a contact to inspect it.

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.

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.