tags: Arduino Lcd I2C

Lcd monitor with I2C interface

intro

Normally, lcd can be connected with Arduino with many wires. With the I2C transfer module, we can use the I2C interface with only 4 wires to connect to your Arduino board.

code

You can find the library in the built-in Arduino libraries manerger or use the expension library below. But you need to notice the little difference between the defult one and the expension one.
LiquidCrystal I2C

• defult wire pinout:

GND	Vcc	SDA	SCL
GND	5V	A4	A5

• defult wire on Mega2560:

GND	Vcc	SDA	SCL
GND	5V	A20	A21

#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2); // set the LCD address to 0x27 for a 16 chars and 2 line display
void setup()
{
  lcd.init(); // initialize the lcd
  lcd.backlight();
  lcd.clear();
  lcd.setCursor(0, 0);    //(posision,line)
  lcd.print("Hellow World!");
}

void loop(){

}

ref

【自造學堂】Arduino如何透過I2C控制LCD模組
【Leon知識領域】LCD I2C 液晶顯示模組