LCD(Liquid Crystal Display) En

It's a module for controlling a 16x2 LCD with just four wires via I2C communication.

The I2C address is mostly [0x27], but there are occasional exceptions, so it's recommended to check the address before use.

Specifications and Required Hardware

• Operating Voltage: 5V
• 16x2 LCD I2C MODULE
• Arduino UNO
• UNO Cable
• F-M Cable (4ea)

Libraries

• Wire (No need to install as it's a default library.)
• LiquidCrystal I2C

Connections

I2C LCD	Arduino UNO
GND	GND
VCC	5V
SDA	A4
SCL	A5

How to Check the Address

You can verify the address by uploading the following code and then running the Serial Monitor.

#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup()
{  
  // Initialize the LCD before use.
  lcd.init();

  // Turn on the LCD backlight.
  lcd.backlight();
  
  // Set the LCD cursor position to (0,0) (top left corner).
  lcd.setCursor(0, 0);

  // Write the text to display.
  lcd.print("Gongzipsa");

  // Move the LCD cursor to position (0,1).
  lcd.setCursor(0, 1);

  // Print the value of val.
  int val = 1004;
  lcd.print(val);
}

void loop(){}

Example Code

#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup()
{  
  // Initialize the LCD before use.
  lcd.init();

  // Turn on the LCD backlight.
  lcd.backlight();
  
  // Set the LCD cursor position to (0,0) (top left corner).
  lcd.setCursor(0, 0);

  // Write the text to display.
  lcd.print("Gongzipsa");

  // Move the LCD cursor to position (0,1).
  lcd.setCursor(0, 1);

  // Print the value of val.
  int val = 1004;
  lcd.print(val);
}

void loop(){}

Example Code Result:

Additional Information

The brightness of the LCD text can be adjusted by controlling the variable resistor.