ESP32 - LCD

This tutorial instructs you how to use ESP32 with LCD I2C. In detail, we will learn:

Hardware Used In This Tutorial

1×ESP-WROOM-32 Dev Module
1×Micro USB Cable
1×LCD I2C
n×Jumper Wires
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Introduction to LCD I2C 16x2

LCD I2C Pinout

LCD I2C has 4 pins:

  • VCC pin: the power supply for the LCD, needs to be connected to VCC (5V).
  • GND pin: connect this pin to GND (0V).
  • SCL pin: I2C clock signal pin
  • SDA pin: I2C data signal pin
  • LCD I2C Pinout

LCD 16x2 Coordinates

LCD I2C 16x2 has 2 rows and 16 columns indexed from 0.

ESP32 LCD I2C Coordinate

Wiring Diagram between LCD I2C and ESP32

The wiring diagram with power supply from USB cable

wiring diagram between esp32 lcd i2c

This image is created using Fritzing. Click to enlarge image

The wiring diagram with power supply from 5v adapter

wiring diagram between esp32 lcd i2c 5v power source

This image is created using Fritzing. Click to enlarge image

How To Program LCD I2C using ESP32

  • Include the LiquidCrystal_I2C library:
#include <LiquidCrystal_I2C.h>
  • Declare a LiquidCrystal_I2C object:
LiquidCrystal_I2C lcd_i2c(0x27, 16, 2); // I2C address 0x27, 16 column and 2 rows
  • Initialize the LCD.
lcd_i2c.init(); lcd_i2c.backlight();
  • Move cursor to the desired position (column_index, row_index)
lcd_i2c.setCursor(column_index, row_index);
  • Print a message to the LCD.
lcd_i2c.print("Hello ESP32!");

※ 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

ESP32 Code

#include <LiquidCrystal_I2C.h> LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C address 0x27, 16 column and 2 rows void setup() { lcd_i2c.init(); // initialize the lcd lcd_i2c.backlight(); lcd_i2c.setCursor(0, 0); // move cursor to (0, 0) lcd_i2c.print("Hello"); // print message at (0, 0) lcd_i2c.setCursor(2, 1); // move cursor to (2, 1) lcd_i2c.print("esp32io.com"); // print message at (2, 1) } void loop() { }

Quick Instructions

  • If this is the first time you use ESP32, see how to setup environment for ESP32 on Arduino IDE.
  • On Arduino IDE, Navigate to Tools Manage Libraries
  • ESP32 add 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.
  • ESP32 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
  • See the result on LCD
  • Try modifying text and position

Video Tutorial

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Do More with LCD

Custom Character

If you want to display special characters or symbols (e.g. emoticon), see how to display the special characters on LCD.

Troubleshooting on LCD I2C

If LCD does not display anything, please see LCD does not work!- Checklist

※ NOTICES