DHT11 Temperature and Humidity Sensor Module

DHT11 is a popular temperature and humidity based digital sensor.

• There is an upgraded version of the DHT11 temperature and humidity sensor available, which is DHT22 Sesnor with higher sensing ranges.
• The sensor uses a capacitive humidity sensor and a thermistor based temperature sensor to measure the ambient humidity and temperature.
• The humidity sensing ranges from 20% to 90% with ±5% accuracy and the temperature sensing ranges from 0 degrees to the 50 degrees Celcius with ±2°C accuracy.
• The sampling time of this sensor is 2 seconds almost.
• This Temperature and Humidity Sensor uses digital pins to communicate with the microcontroller unit and does not have any kind of analog pins.
• The module also has the inbuilt pull-up resistor and additional filter capacitor to support the DHT11 sensor.
• Thus the module is available in ready to go mode and can be directly connected with the microcontroller unit without using any kind of additional components.
• Pin :- Pin 1: Power VCC(+) (3.3VDC to 5.5VDC ) Pin 2: Digital Serial Data Output Pin 3: Ground The above image is showing the pinout of the DHT11 sensor.
• Connect 3.3-5.5V in the VCC (+) pin and ground on the GND(-) pin.
• Connect the middle pin which is a digital output of the sensor module with a microcontroller digital I/O pin.
• Use the referenced library that is given below of this page for interfacing the sensor with the microcontroller unit.
• DHT11 Sensor Specifications: Operating Voltage: 3.3V to 5.5V Digital I/O 5 Hz sampling rate (Once every 2 Seconds) Measuring current: 0.3mA Low power consumption Temperature range: 0 to 50 degree C Humidity range: 20% to 90% Accuracy: ±2°C and ±5% Dimension: 3.5 x 2 x 6.5 cm Package Includes: 1 x DHT11 Temperature and Humidity Sensor Module.