Reading Temperature and Humidity with DHT22 on ESP32

Overview

Learn how to read temperature and humidity from a DHT22 sensor using an ESP32 and Arduino code. This project is useful for weather stations, room monitoring, and simple climate-control projects.

Instructions

Step by step

1. Connect the DHT22 VCC pin to 3.3V. 2. Connect the DHT22 GND pin to GND. 3. Connect the DHT22 Data pin to D4. 4. Run the code and open the Serial Monitor. 5. Change the temperature and humidity values in the simulator. 6. Check if the printed temperature and humidity values change. 7. If the values show as NaN, check the wiring and make sure the data pin matches the code.

Code

Source code

code

#include <DHT.h>

#define DHTPIN 4
#define DHTTYPE DHT22

DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(115200);
  dht.begin();

  Serial.println("DHT22 Temperature and Humidity Test");
}

void loop() {
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();

  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println(" C");

  Serial.print("Humidity: ");
  Serial.print(humidity);
  Serial.println(" %");

  delay(2000);
}

More projects with this sensor

● Beginner

Reading Temperature and Humidity with DHT22 on Raspberry Pi Pico

Learn how to read temperature and humidity from a DHT22 sensor using a Raspberry Pi Pico. This proje...

View project