DHT11 Temperature And Humidity Sensor Module With DIP Red LED

The DHT11 is a widely used digital sensor module that combines a capacitive humidity sensor and an NTC thermistor for temperature measurement. It outputs a calibrated digital signal, simplifying integration with MCUs and requiring no analog inputs.

It provides:

Humidity Range: 20% to 90% RH with ±5% accuracy
Temperature Range: 0°C to 50°C with ±2°C accuracy

With a sampling rate of approximately 2 seconds and a one-wire digital interface, it ensures real-time and easy data communication. The onboard power LED and included pull-up resistor and filtering capacitor make it ready for use without additional components.

Package Includes:

1 x DHT11 Temperature and Humidity Sensor Module with DIP Red LED
3 x Female-to-female jumper wires

DHT Temperature Humidity Sensor

24.50 AED (Tax included)

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Features:

Accurate Relative Humidity and Temperature Measurement
Full Range Temperature Compensation
Calibrated Digital Signal Output
DIP Red Power LED Indicator
Long-Term Stability
Low Power Consumption
Ready-to-Use with Microcontrollers (MCUs)
Screw Hole for Secure Fixation

Principle of Work:

The MCU initiates communication by sending a trigger signal. The DHT11 responds by sending 40 bits of pre-collected data via a single-wire digital interface. Each communication cycle transmits one data set, requiring a new trigger for the next reading.

Modules include a pull-up resistor and filter capacitor, unlike standalone sensors that may require these externally.

Pinout of the Board:

DHT11 Pinout

Pin	Label	Description
1	VCC	Power supply (3.5V to 5.5V)
2	Data	Digital output (temperature and humidity)
3	GND	Ground

Note: Incorrect wiring (reversing VCC and GND) may damage the sensor.

Applications:

Home Automation
Weather Monitoring Systems
HVAC Control Systems
Greenhouse and Precision Agriculture
Temperature & Humidity Data Logging
Industrial Process Monitoring
IoT Environmental Sensing
Laboratory Research and Experiments

Circuit Diagram:

DHT11 Circuit

Wiring with Arduino:
Connect:

VCC → 5V on Arduino
GND → GND on Arduino
OUT → A0 (analog input pin on Arduino)

Library Installation:

Download the DHT library (search for "DHT sensor library by Adafruit" in Library Manager).
In Arduino IDE, go to Sketch > Include Library > Manage Libraries....
Install the library using the ZIP file or directly from the Library Manager.

Example Arduino Code:

#include "dht.h"
#define dht_pin A0  // Connect DHT11 OUT pin to analog pin A0

dht DHT;

void setup() {
  Serial.begin(9600);
  delay(500);
  Serial.println("DHT11 Humidity & Temperature Sensor\n");
  delay(1000);
}

void loop() {
  DHT.read11(dht_pin);

  float humidity = DHT.humidity;
  float temperature = DHT.temperature;

  Serial.print("Humidity = ");
  Serial.print(humidity);
  Serial.print("% ");
  Serial.print("Temperature = ");
  Serial.print(temperature);
  Serial.println(" C");

  delay(5000);
}

Technical Details:

Input Voltage: 3.3V ~ 5.5V
Current Consumption: 0.5mA ~ 2.5mA
Output Type: Digital (one-wire interface)
Humidity Range: 20% ~ 90% RH
Humidity Accuracy: ±5% RH
Humidity Resolution: 1% RH
Temperature Range: 0°C ~ 50°C
Temperature Accuracy: ±2°C
Temperature Resolution: 1°C
Power Indicator: Red LED
Pin Count: 3
Module Size: 32mm x 14mm

Comparisons:

Feature	DHT11	DHT22	LM35
Temperature Range	0°C to 50°C (±2°C)	-40°C to 80°C (±0.5°C)	-55°C to 150°C (±0.5°C)
Humidity Range	20% to 90% (±5%)	0% to 100% (±2-5%)	—
Output Type	Digital	Digital	Analog
Power Consumption	Low	Low	Low
Stability	Good	Excellent	Excellent
Cost	Low	Moderate	Moderate
Application Areas	Basic sensing, DIY	Advanced environmental monitoring	Industrial, precise temp monitoring

Resources:

Tutorial 1