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 | × | Micro USB Cable | |
1 | × | LCD I2C | |
1 | × | Temperature Sensor DS18B20 | |
1 | × | Jumper Wires | |
1 | × | (Optional) 5V Power Adapter | |
1 | × | (Optional) DC Power Jack | |
1 | × | (Optional) ESP32 Screw Terminal Adapter |
One of the following breadboard:
1 | × | Full-sized 830-Point Breadboard | |
1 | × | Half-sized 400-point Breadboard | |
1 | × | Mini-sized 170-point Breadboard | |
1 | × | All-sized Breadboard Kit |
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
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.
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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