ESP32 - Temperature Sensor - LCD
This tutorial instructs you how to use ESP32 to read the temperature from DS18B20 temperature sensor and display it on LCD I2C 16x2.
Hardware Used In This Tutorial
1 | × | ESP-WROOM-32 Dev Module | |
1 | × | USB Cable Type-C | |
1 | × | LCD I2C | |
1 | × | Temperature Sensor DS18B20 | |
1 | × | Breadboard | |
1 | × | Jumper Wires | |
1 | × | (Optional) DC Power Jack | |
1 | × | (Recommended) ESP32 Screw Terminal Adapter |
Or you can buy the following sensor kit:
1 | × | DIYables Sensor Kit 30 types, 69 units |
Buy Note: Numerous DS18B20 sensors available in the market are of poor quality. We strongly advise purchasing the sensor from the DIYables brand via the link above; we conducted tests, and it performed reliably.
Introduction to Temperature Sensor and LCD
We have specific tutorials about temperature sensor and LCD. Each tutorial contains detailed information and step-by-step instructions about hardware pinout, working principle, wiring connection to ESP32, ESP32 code... Learn more about them at the following links:
Wiring Diagram

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.
For ease of connection, it's advisable to purchase a DS18B20 sensor that comes with a wiring adapter equipped with a built-in resistor, eliminating the need for an additional resistor in the wiring.

This image is created using Fritzing. Click to enlarge image
ESP32 Code
※ NOTE THAT:
The LCD I2C address can be different from each manufacturer. In the code, we used address of 0x27 that is specified by DIYables manufacturer
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 “OneWire” on the search box, then look for the OneWire library by Paul Stoffregen
- Click Install button to install OneWire library.

- Type “Dallas” on the search box, then look for the DallasTemperature library by Miles Burton.
- Click Install button to install DallasTemperature library.

- Type “LiquidCrystal I2C” on the search box, then look for the LiquidCrystal_I2C library by Frank de Brabander
- Click Install button to install LiquidCrystal_I2C library.

- Copy the above code and paste it to Arduino IDE.
- Compile and upload code to ESP32 board by clicking Upload button on Arduino IDE

- Make the sensor hotter or colder by gripping the DS18B20 temerature sensor on your hand, or embedding it on hot and cold water.
- See the result in LCD
If the LCD displays nothing, see Troubleshooting on LCD I2C
Line-by-line Code Explanation
The above ESP32 code contains line-by-line explanation. Please read the comments in the code!
Video Tutorial
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