ESP32 - DHT22
This tutorial instructs you how to use ESP32 to read temperature and humidity value from DHT22 sensor, and print it to Serial Monitor. The tutorial provide instructions for both DHT22 sensor and DHT22 module.
Hardware Used In This Tutorial
Or you can buy the following sensor kit:
1 | × | DIYables Sensor Kit 30 types, 69 units |
Introduction to DHT22 Temperature and Humidity Sensor
DHT22 | |
---|---|
Operating Voltage | 3 to 5V |
The humidity range | 0% to 100% |
The humidity accuracy | ± 2% to 5% |
The temperature range | -40°C to 80°C |
The temperature accuracy | ± 0.5°C |
The reading rate | 0.5Hz (one time per 2 seconds) |
DHT22 Pinout
DHT22 has two form: raw sensor and module:

DHT22 sensor includes 4 pins:
- GND pin: connect this pin to GND (0V)
- VCC pin: connect this pin to VCC (3.3V or 5V)
- DATA pin: the pin is used to communicate between the sensor and ESP32
- NC pin: Not connected
We highily recommend you using DHT22 module. The modules have a built-in resistor and have only three pin: VCC, GND, and DATA pins (or alternatively: +, -, and OUT pins).
Wiring Diagram between DHT22 and ESP32
Wiring to ESP32 is the same for both sensors. In orginal form, A resistor from 5K to 10K Ohms is required to keep the data line high and in order to enable the communication between the sensor and the ESP32
ESP32 - DHT22 Sensor Wiring

This image is created using Fritzing. Click to enlarge image
If you're unfamiliar with how to supply power to the ESP32 and other components, you can find guidance in the following tutorial: How to Power ESP32.
ESP32 - DHT22 Module Wiring
Most of DHT22 sensor modules have a built-in resistor, so you don't need to add it. it saves us some wiring or soldering works.

This image is created using Fritzing. Click to enlarge image
ESP32 Code - DHT22
Quick Instructions
- If this is the first time you use ESP32, see how to setup environment for ESP32 on Arduino IDE.
- Do the wiring as above image.
- Connect the ESP32 board to your PC via a micro USB cable
- Open Arduino IDE on your PC.
- Select the right ESP32 board (e.g. ESP32 Dev Module) and COM port.
- On Arduino IDE, Navigate to Tools Manage Libraries

- Type “DHT” on the search box, then look for the DHT sensor library by Adafruit
- Install the library by clicking on Install button.

- A windows appears to ask you to install dependencies for the library
- Install all dependencies for the library by clicking on Install All button.

- Copy one of the above code and open with Arduino IDE
- Compile and upload code to ESP32 board by clicking Upload button on Arduino IDE
- Make the sensor colder or hotter. For example, putting the sensor near a hot cup of coffee
- See the result on Serial Monitor. It looks like the below:.
Video Tutorial
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