DHT11 Module (Digital Humidity & Temperature Sensor)

Here's a step-by-step tutorial on how to connect a DHT11 module board to an Arduino:

Step 1: Gather the Required Equipment:

• Arduino board (such as Arduino Uno)
• DHT11 module board
• Breadboard
• Jumper wires

Step 2: Understand the DHT11 Module:

• The DHT11 is a digital humidity and temperature sensor that can be used to measure the ambient temperature and relative humidity.
• It usually has four pins: VCC (power supply), GND (ground), DATA (data signal), and NC (not connected).
• The VCC pin is used to provide power to the module (typically 5V).
• The GND pin is connected to the ground of the Arduino.
• The DATA pin is used to communicate the temperature and humidity readings to the Arduino.
• The NC pin is not used and can be left unconnected.

Step 3: Connect the DHT11 Module to the Breadboard:

• Insert the DHT11 module into the breadboard so that its pins are on separate rows.
• Connect the VCC pin of the DHT11 module to the 5V pin on the Arduino board using a jumper wire.
• Connect the GND pin of the DHT11 module to the GND pin on the Arduino board using a jumper wire.
• Connect the DATA pin of the DHT11 module to any digital pin on the Arduino board, such as D2, using a jumper wire.

Step 4: Read the DHT11 Sensor Data:

• Open the Arduino IDE software on your computer and create a new sketch.
• Copy and paste the following code into the sketch:

#include <DHT.h> // Include the DHT library

#define DHTPIN 2     // Pin number to which the DHT11 data pin is connected
#define DHTTYPE DHT11   // DHT11 sensor type

DHT dht(DHTPIN, DHTTYPE); // Create a DHT object

void setup() {
  Serial.begin(9600); // Start serial communication
  dht.begin(); // Initialize the DHT sensor
}

void loop() {
  delay(2000); // Delay for stability
  
  // Read temperature and humidity from the DHT sensor
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();
  
  // Print the readings to the serial monitor
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.print(" °C, Humidity: ");
  Serial.print(humidity);
  Serial.println(" %");

}

• Verify and upload the code to your Arduino board.
• Open the Serial Monitor in the Arduino IDE to view the temperature and humidity readings from the DHT11 module.
• Observe the readings changing in the serial monitor as the DHT11 module measures the ambient temperature and relative humidity.

That's it! You have successfully connected a DHT11 module board to an Arduino and read its temperature and humidity data. You can now use the temperature and humidity readings in your Arduino project for various applications such as weather monitoring, environmental sensing, and more.