const int LED_ID = 3;
const int BUTTON_ID = 8;
int isPressed = 0;
int state = 0;

void setup() {
  pinMode(LED_ID, OUTPUT);
  digitalWrite(LED_ID, LOW);
  pinMode(BUTTON_ID, INPUT);
  Serial.begin(9600);
}

void loop() {
  isPressed = digitalRead(BUTTON_ID);

  if (isPressed && state == 0 )
  {
    digitalWrite(LED_ID, HIGH);
    state = 1;
  }
  else if (isPressed && state == 1)
  {
    digitalWrite(LED_ID, LOW);
    state = 0;
  }
    Serial.print(state);
    delay(50);
}