Arduino - How to use Liquid Crystal Display I2C

Arduino - How to use Liquid Crystal Display I2C

In this article will be How to use Arduino board with Liquid Crystal I2C, It same Arduino Lcd Liquid Crystal Display  Examples applications, Arduino boards send text or output from sensor to show on LCD screen. But there is another control unit (PCF8574) to control the screen. This reduces the number of pins to 4 lines.

Details of PCF8574 (LCD Controller)

1. Signal pin (i2c) from Arduino Board
2. Potentiometer for adjust Contrast of character
3. Address Selector pad
4. Black light jumper 

Circuit

Install Library

• go to Library Manager -> Search  "LiquidCrystal i2c" -> Install  (See more)
  

Scan I2C Adress of PCF8574 (LCD Controller)

• Check connection and Search Address of PCF8574 (LCD Controller) (See more)
  
• After find the PCF8574 Address, Take this in Example Code (0x27 or 0x3F)

Example Code

	#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
	LiquidCrystal_I2C lcd(0x3f,16,2); // set the LCD address to 0x27 for a 16 chars and 2 line display
	//LiquidCrystal_I2C lcd(0x27,20,4); // set the LCD address to 0x27 for a 20 chars and 4 line display
	void setup()
	{
	lcd.init(); // initialize the lcd
	// Print a message to the LCD.
	lcd.backlight();
	lcd.setCursor(3,0);
	lcd.print("Hello, world!");
	lcd.setCursor(4,1);
	lcd.print(" Arduino!");
	delay(2000);
	}
	void loop()
	{
	lcd.clear();
	lcd.print("Hello ");
	lcd.print(millis()/1000);
	delay(1000);
	}

view raw arduino_liquid_crystal_i2c_display.ino hosted with ❤ by GitHub

output program

* If LCD not show characters try adjust the potentiometer 

Referent

- https://github.com/marcoschwartz/LiquidCrystal_I2C