1602(16x2) LCD Display with I2C/IIC Interface - Blue Backlight

The 1602 (16x2) LCD Display with I2C/IIC Interface is a widely used component for Arduino projects. It simplifies wiring by reducing the number of pins needed from 16 to just 4 using the I2C protocol.

Technical Specifications:

• Operating Voltage: 5V DC
  
• Display Type: Alphanumeric LCD (16 characters × 2 lines)
  
• Interface: I2C (via PCF8574 I/O expander)
  
• Controller IC: HD44780 (via PCF8574 I2C backpack)
  
• Logic Voltage: 5V TTL logic compatible
  
• Backlight Colour: Usually blue with white text (may vary)
  
• Contrast Control: Built-in potentiometer on I2C backpack
  
• Communication Lines: SDA, SCL (2-wire I2C)
  
• Power Consumption: ~1–3 mA (backlight off), ~15–20 mA (with backlight)
  
• I2C Address: Typically 0x27 or 0x3f (can vary by manufacturer)

Pinouts:

Connection with Arduino:

Sample code:

Install LiquidCrystal I2C Library:
Go to Sketch > Include Library > Manage Libraries…
Search for LiquidCrystal_I2C
Install the Library

Code:
#include <Wire.h>
#include <LiquidCrystal_I2C.h>

// Set the LCD address to 0x27 or 0x3F depending on your module
LiquidCrystal_I2C lcd(0x27, 16, 2);  // 16 columns, 2 rows

void setup() {
  lcd.init();            // Initialize the LCD
  lcd.backlight();       // Turn on backlight
  lcd.setCursor(0, 0);   // Column 0, Row 0
  lcd.print("Hello, World!");
  lcd.setCursor(0, 1);   // Column 0, Row 1
  lcd.print("I2C LCD Ready");
}

void loop() {
  // Nothing here for now
}