LCD module, 20x4, with IIC/I2C driver

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How to Test LCD

Odoo image and text block

2. Connect the dupont wires from Arduino board to LCD driver

LCD module (4 pin) -> Arduino Uno (4 pin)

LCD module​ ​Dupont Wire ​Arduino Uno
​GND Black​ ​GND
​VCC White​ ​+5V
​SDA ​Violet ​A4
​SCL ​Gray ​A5

3. Copy and Paste the following code to your Arduino IDE and upload to Arduino Uno

//Circuit Blocks LCD Test Software v1.0 for 20x4 LCD
//revised code from for LCD test

// Get the LCD I2C Library here: 
// Download ''. Install downloaded library.
// Move any other LCD libraries ('C:\Documents\Arduino\libraries') to another folder or delete them.

#include <LiquidCrystal_I2C.h>
#include <Wire.h>  // Comes with Arduino IDE

LiquidCrystal_I2C lcd(0x3F, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);  // Set the LCD I2C address

void setup()
  lcd.begin(20,4);         // initialize the lcd for 20 chars 4 lines, turn on backlight

// ------- Quick 3 blinks of backlight  -------------
//this is not really important as it will only toggle the backlight on and off
//you can remove or comment these next 8 lines
  for(int i = 0; i< 3; i++)
  lcd.backlight(); // finish with backlight on  

//-------- Write characters on the display ------------------
  lcd.setCursor(4,0);                        //Start at character 4 on line 0
  lcd.print("Hello World!");
  lcd.setCursor(2,1);                        //Start at character 2 on line 1
  lcd.print("20x4 LCD module");
  lcd.setCursor(0,2);                        //Start at character 0 on line 2
  lcd.setCursor(1,3);                       //Start at character 1 on line 3

void loop()