#define LED_PIN 8
#define BUTTON_PIN 7

byte lastButtonState = LOW;
byte ledState = LOW;

unsigned long debounceDuration = 50; // millis
unsigned long lastTimeButtonStateChanged = 0;

void setup() {
  pinMode(LED_PIN, OUTPUT);
    pinMode(BUTTON_PIN, INPUT);
    }

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