Setting up the DHT22 to the ESP32 with the Arduino IDE

Temperature | Humidity

In this article, we will connect the DHT22 to the ESP32 chip. This means we should be able to tell the humidity and temperature within the location you have your DHT22 chip connect. So let’s get started.

Photo by Inge Maria on Unsplash

What I will be utilizing in this article

I will be of course using an ESP32. The power is done via a USB cable from my pc to the board. I will also be utilizing a breadboard. https://amzn.to/3ppyVas

I will also be utilizing a DHT22 device which will be used to gather temperature and humidity data.

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Install the DHT Libraries to Arduino IDE

In order to use the DHT22, we must install the libraries first.

1. Go to Sketch > Manage Libraries > Library Manager
2. Search for “DHT” and select the “DHT sensor library”. You can install it by click install at the bottom right. Make sure to “Install all” if asked. This will install the Adafruit Unified Sensor dependency for the DHT Sensor library. Close when done. The library Github repo can be found at https://github.com/adafruit/DHT-sensor-library

3. Now add the following code within the Arduino IDE:

/*
  Author: Kevin Summersill
*/
// Add the DFH Library
#include "DHT.h"
// Define the DHT Type
#define DHTTYPE DHT22
// Define the GPIO Pin Associated to the ESP32
#define DHTPIN 4
void initializeDHT22Sensor() {
  // Initialize DHT22 Sensor
  DHT dht(DHTPIN, DHTTYPE);
  pinMode(DHTPIN, INPUT);
  dht.begin();  
  
  // Get the Temperature
  float temperature = dht.readTemperature(true);
  Serial.println(temperature);
  
  // Get Humidity Data
  float humidity = dht.readHumidity();
  Serial.println(humidity);