const int buttonPin = 18;    // The pin the button is connected to
int buttonState = LOW;      // The current state of the button
int lastButtonState = LOW;  // The previous state of the button
bool switchState = false;   // The state of the switch

void setup() {
  Serial.begin(115200);      // Initialize serial communication at 115200 baud rate
  pinMode(buttonPin, INPUT); // Set the button pin as an input
}

void loop() {
  buttonState = digitalRead(buttonPin); // Read the state of the button

  // Check if the button was pressed
  if (buttonState == HIGH && lastButtonState == LOW) {
    switchState = !switchState; // Toggle the switch state
    if (switchState) {
      Serial.println("switch on...");
    } else {
      Serial.println("switch off...");
    }
  }

  lastButtonState = buttonState; // Save the current state as the last state

  delay(50); // Debounce delay
}