#include <Wire.h>               // Include the I2C library
#include <Adafruit_GFX.h>        // Include the GFX library
#include <Adafruit_SSD1306.h>    // Include the SSD1306 OLED library

#define SCREEN_WIDTH 128         // OLED display width, in pixels
#define SCREEN_HEIGHT 64         // OLED display height, in pixels
#define OLED_RESET    -1         // Reset pin not used
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);  // Create an OLED object

const char* message = "Real-time Scrolling Message on OLED Display";  // Message to display
int messageLength;  // Store the length of the message

void setup() {
  // Initialize serial communication for debugging (optional)
  Serial.begin(9600);
  
  // Initialize the OLED display
  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) 
  {  // Initialize with I2C address 0x3C
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);  // Infinite loop if the display isn't found
  }
  
  display.clearDisplay();  // Clear the display buffer
  
  display.setTextSize(1);        // Set text size to normal (1)
  display.setTextColor(SSD1306_WHITE);  // Set text color to white
  display.setCursor(0, 0);       // Set the cursor to top-left corner

  messageLength = strlen(message);  // Get the length of the message
}

void loop() 
{
  // Scroll the message from right to left, character by character
  for (int i = 0; i < messageLength + SCREEN_WIDTH; i++) {
    display.clearDisplay();  // Clear the display

    // Display the message starting from different positions based on the scroll index
    display.setCursor(SCREEN_WIDTH - (i % (messageLength + SCREEN_WIDTH)), 0);  // Calculate the x position
    display.print(message);  // Print the message

    display.display();  // Refresh the display with the new content
    delay(150);         // Delay to control the scroll speed
  }
}