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1d Interfacing Arduino with LCD.md

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Arduino LCD I2C Display Experiment

Aim

To interface a 16x2 LCD with Arduino using the I2C protocol and display dynamic messages.

Components Required

  • Arduino board (e.g., Arduino Uno)
  • 16x2 I2C LCD module (address: 0x27)
  • Breadboard
  • Jumper wires

Circuit Diagram

  1. Connect the SDA pin of the I2C LCD module to the SDA pin of the Arduino (on Arduino Uno).
  2. Connect the SCL pin of the I2C LCD module to the SCL pin of the Arduino (on Arduino Uno).
  3. Connect the VCC pin of the I2C LCD module to the 5V pin of the Arduino.
  4. Connect the GND pin of the I2C LCD module to the GND pin of the Arduino.

Video Simulation

Program

Code

#include <LiquidCrystal_I2C.h>

// Initialize the I2C LCD with address 0x27 and dimensions 16x2
LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  lcd.init();          // Initialize the LCD
  lcd.backlight();     // Turn on the backlight
  lcd.setCursor(5, 0); // Set the cursor to column 5, row 0
  lcd.print("HAI!!!"); // Print "HAI!!!" on the LCD
  delay(1500);         // Wait for 1.5 seconds
}

void loop() {
  lcd.clear();          // Clear the LCD
  lcd.setCursor(5, 0);  // Set the cursor to column 5, row 0
  lcd.print("LCD-12C"); // Print "LCD-12C" on the first row
  lcd.setCursor(2, 1);  // Set the cursor to column 2, row 1
  lcd.print("HELLO WORLD !"); // Print "HELLO WORLD !" on the second row
  delay(2000);          // Wait for 2 seconds
}

Steps to Execute

  1. Setup the Circuit:

    • Connect the I2C LCD module to the Arduino as described in the Circuit Diagram section.

  2. Upload the Code:

    • Open the Arduino IDE.
    • Install the LiquidCrystal_I2C library via the Library Manager if not already installed.
    • Copy the code into the Arduino IDE.
    • Upload the code to the Arduino board.

  3. Observe the LCD:

    • The LCD displays "HAI!!!" for 1.5 seconds.
    • It then alternates between:
      • "LCD-12C" on the first row.
      • "HELLO WORLD !" on the second row.

Notes

  • Ensure the correct I2C address (0x27) for your LCD module. Use an I2C scanner if necessary to find the address.
  • Install the LiquidCrystal_I2C library via the Library Manager in the Arduino IDE if it’s not already available.

Troubleshooting

  1. LCD Not Displaying:

    • Check connections for SDA, SCL, VCC, and GND.
    • Verify the I2C address using an I2C scanner.
    • Ensure the LiquidCrystal_I2C library is correctly installed.

  2. Backlight Off:

    • Ensure lcd.backlight() is called in the setup.