#define LED_PIN 23       // Pin connected to the LED
#define BUTTON_PIN 22    // Pin connected to the button

bool ledState = false;   // Variable to store the LED state
bool lastButtonState = HIGH; // Track the previous state of the button

void setup() {
  pinMode(LED_PIN, OUTPUT);          // Set LED pin as output
  pinMode(BUTTON_PIN, INPUT_PULLUP); // Set button pin as input with pull-up
  Serial.begin(115200);              // Initialize serial communication
  Serial.println("Enter '1' to turn ON the LED and '0' to turn it OFF.");
}

void loop() {
  // Check button input
  handleButtonInput();

  // Check serial input
  handleSerialInput();
}

void handleButtonInput() {
  bool currentButtonState = digitalRead(BUTTON_PIN); // Read button state

  if (currentButtonState == LOW && lastButtonState == HIGH) { // Button pressed
    ledState = !ledState;                  // Toggle LED state
    digitalWrite(LED_PIN, ledState ? HIGH : LOW);
    Serial.println(ledState ? "LED is ON (Button)" : "LED is OFF (Button)");
    delay(300); // Simple debounce delay
  }

  lastButtonState = currentButtonState; // Update last button state
}

void handleSerialInput() {
  if (Serial.available() > 0) {          // Check if data is available on Serial
    char input = Serial.read();          // Read the incoming data
    if (input == '1') {                  // If '1' is received
      ledState = true;                   // Set LED state to ON
      digitalWrite(LED_PIN, HIGH);
      Serial.println("LED is ON (Serial)");
    } else if (input == '0') {           // If '0' is received
      ledState = false;                  // Set LED state to OFF
      digitalWrite(LED_PIN, LOW);
      Serial.println("LED is OFF (Serial)");
    } else {
      Serial.println("Invalid input. Please enter '1' or '0'.");
    }
  }
}