DHT11 Temperature And Humidity Sensor Module With DIP Red LED

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:

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:

Wiring with Arduino:
Connect:

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

Library Installation:

1. Download the DHT library (search for "DHT sensor library by Adafruit" in Library Manager).
2. In Arduino IDE, go to Sketch > Include Library > Manage Libraries....
3. 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:

Resources:

• Tutorial 1