DHT11 Humidity / Temperature Sensor Module

Sensor uses a 1-wire interface to report both humidity (20-90%) and temperature (0-50°C).

Description

The DHT11 Humidity / Temperature Sensor Module uses a 1-wire interface to report both humidity (20-90%) and temperature (0-50°C).

PACKAGE INCLUDES:

• DHT11 Humidity / Temperature Sensor Module

KEY FEATURES OF DHT11 HUMIDITY / TEMPERATURE  MODULE:

• Reports humidity over range of 20% to 90%
• Reports temperature over range of 0°C to 50°C
• Uses 1-Wire interface
• 3.3 and 5V logic compatible

This module utilizes the DHT-11 which is a combined humidity and temperature sensor assembly.   It includes a power LED that lights when power is applied as well as a 3-wire F/F cable for hooking it up.

The DHT11 sensor is capable of reading humidity over the range of 20-90% with an accuracy of +/- 5% and temperature over the range of 0 – 50°C with an accuracy of +/- 2°C.

The sensor is written and read via a single digital pin and requires the use of a library for the communications as the communication protocol itself is quite complex.  With an Arduino, the DHTLib library can be downloaded from the Arduino site or GitHub.

The device does have a minimum sampling time of 1Sec so the sensor cannot be polled more often than once every second or bad data may be retrieved.

Module Connections

The module has a 3-pin header on the assembly.

1 x 3 Header

• Vcc  =      Connect to 3.3V to 5V.
• DATA  =  Digital sensor I/O – Connects to a digital pin on a microcontroller
• GND  =      Connect to system ground.  This ground needs to be in common with the microcontroller.