//Donna Ginting
#include <LiquidCrystal.h>

// Initialize the LCD library with the numbers of the interface pins
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

// Define the letters to display
const String letter1 = "      3 B"; // Letter for the first line
const String letter2 = "  ELEKTROMEDIK"; // Letter for the second line

void setup() {
  // Set up the LCD's number of columns and rows
  lcd.begin(16, 2);
  // Display the initial letters
  displayLetters(letter1, letter2);
}

void loop() {
  // Switch the positions of the letters 2 times
  for (int i = 0; i < 2; i++) {
    delay(1000); // Pause before switching
    switchPositions();
    delay(1000); // Pause before switching back
    switchPositions();
  }
  
  // Stop the loop after switching 2 times
  while (true); // Prevent further execution
}

// Function to display letters on the LCD
void displayLetters(String topLetter, String bottomLetter) {
  lcd.clear(); // Clear the LCD
  lcd.setCursor(0, 0); // Set cursor to the first line
  lcd.print(topLetter); // Print the top letter
  lcd.setCursor(0, 1); // Set cursor to the second line
  lcd.print(bottomLetter); // Print the bottom letter
}

// Function to switch the positions of the letters
void switchPositions() {
  static bool swapped = false; // Track whether letters are swapped
  if (swapped) {
    displayLetters(letter1, letter2); // Show original positions
  } else {
    displayLetters(letter2, letter1); // Show swapped positions
  }
  swapped = !swapped; // Toggle the swapped state
}