const int ledPin = 9;
const int buttonPin = 7;

byte lastButtonState = LOW;
byte ledState = LOW;

unsigned long debounceDuration = 53;
unsigned long lastTimeButtonStateChanged = 0;

void setup() {
  pinMode(ledPin, OUTPUT); // Initialize the pin as an output
  pinMode(buttonPin, INPUT);
}

void loop() {
if (millis() - lastTimeButtonStateChanged > debounceDuration) {
  byte buttonState = digitalRead(buttonPin);
  if (buttonState != lastButtonState) {
    lastTimeButtonStateChanged = millis();
    lastButtonState = buttonState;
    if (buttonState == LOW) {
      ledState = (ledState == HIGH) ? LOW:HIGH;
      digitalWrite(ledPin, ledState);
    }
  }

}
}