// Fnu Shoaib Ahmed, 652420658, fahme8
// Lab 3 - Liquid Crystal Display - LCD

// Description - This code is designed to power up an LCD with 2 lines of text. The first line is a scrolling quote, 
// and the second line is a centered name displayed at all times.

// Assumptions - The potentiometer will control display brightness and the wiring is correct.

// References - I used the prelab links to set up the LCD and the potentiometer.

#include <LiquidCrystal.h>

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

char name[] = "652420658";
char quote[] = "Aspire to Inspire before you Expire...                "; // Longer quote for scrolling

int quoteIndex = 0;
unsigned long previousMillis = 0;
const long interval = 300;  // Adjust the scrolling speed (milliseconds)

void setup() {
  // Set up the LCD's number of columns and rows
  lcd.begin(16, 2);

  // Use sprintf() to format the name string
  char formattedName[40];  // Buffer for the formatted name (16 characters + null terminator)
  int padding = (16 - strlen(name)) / 2;  // Calculate the padding to center the name
  sprintf(formattedName,"     %s      ","Shoaib");  // Format the name with padding

  // Display the centered name on the second line
  lcd.setCursor(0, 1);  // Start at the beginning of the second line
  lcd.print(formattedName);  // Print the formatted name
}

void loop() {
  unsigned long currentMillis = millis();

  // Check if enough time has passed for scrolling
  if (currentMillis - previousMillis >= interval) {
    // Save the current time
    previousMillis = currentMillis;

    // Scroll the quote on the first line
    lcd.setCursor(0, 0);
    for (int i = 0; i < 16; i++) {
      lcd.print(quote[(quoteIndex + i) % strlen(quote)]);
    }

    // Move to the next character in the quote
    quoteIndex++;
    if (quoteIndex >= strlen(quote)) {
      quoteIndex = 0;  // Reset to the beginning of the quote
    }
  }
}