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

// Initialize the LCD with the I2C address (replace 0x27 with the address you found)
LiquidCrystal_I2C lcd(0x27, 20, 4); // Change 0x27 to your LCD's address

// Define the shared pin for the button and LED
const int sharedPin = 26;

void setup() {
  // Initialize Serial for debugging
  Serial.begin(115200);
  Serial.println("Initializing...");

  // Initialize the LCD with 20 columns and 4 rows
  Wire.begin(8, 9); // Use GPIO 8 (SDA) and GPIO 9 (SCL) for ESP32-S2
  lcd.begin(20, 4);
  lcd.backlight(); // Turn on the backlight

  // Set up the shared pin as input with internal pull-up resistor
  pinMode(sharedPin, INPUT_PULLUP);

  // Display initial message
  lcd.setCursor(0, 0);
  lcd.print("Press the button");
  Serial.println("LCD initialized. Waiting for button press...");
}

void loop() {
  // Check if the button is pressed (LOW because of pull-up)
  if (digitalRead(sharedPin) == LOW) {
    Serial.println("Button pressed. Displaying 'Hello' and turning on LED...");

    // Display "Hello" on the LCD
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Hello");

    // Turn on the LED by setting the shared pin as output and driving it HIGH
    pinMode(sharedPin, OUTPUT);
    digitalWrite(sharedPin, HIGH);

    // Wait for 10 seconds
    delay(10000);

    // Clear the LCD after 10 seconds
    lcd.clear();
    Serial.println("Clearing LCD...");

    // Turn off the LED by setting the shared pin back to input mode
    pinMode(sharedPin, INPUT_PULLUP);

    // Display the initial message again
    lcd.setCursor(0, 0);
    lcd.print("Press the button");
    Serial.println("Waiting for button press...");
  }
}