Overview of the DHT22 Sensor

Wiring the DHT22 to Arduino

1. Connections: The DHT22 typically has three pins (VCC, GND, and DATA). Connect them as follows:

• VCC: Connect to the 5V pin on the Arduino.
• GND: Connect to the ground (GND) pin on the Arduino.
• DATA: Connect to a digital pin on the Arduino (e.g., pin 7). A 10kΩ pull-up resistor is recommended between the DATA pin and VCC to ensure stable readings.

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• 2 Sources

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Installing the DHT22 Library

1. Open the Arduino IDE.
2. Go to Sketch > Include Library > Manage Libraries.
3. Search for "DHT sensor library" and install it.

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4. 2 Sources

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Example Code

#include "DHT.h"
#define DHTPIN 7     // Pin where the DHT22 is connected
#define DHTTYPE DHT22   // DHT 22 (AM2302)
DHT dht(DHTPIN, DHTTYPE);
void setup() {
Serial.begin(9600);
dht.begin();
}
void loop() {
delay(2000); // Wait a few seconds between measurements
float h = dht.readHumidity(); // Read humidity
float t = dht.readTemperature(); // Read temperature in Celsius
// Check if any reads failed and exit early (to try again).
if (isnan(h) || isnan(t)) {
Serial.println("Failed to read from DHT sensor!");
return;
}
Serial.print("Humidity: ");
Serial.print(h);
Serial.print(" %\t");
Serial.print("Temperature: ");
Serial.print(t);
Serial.println(" *C");
}

Running the Code

1. Upload the code to your Arduino board.
2. Open the Serial Monitor (set to 9600 baud) to view the temperature and humidity readings.

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