bool state=0;

void setup() {
  Serial.begin(115200);
  pinMode(D2, OUTPUT);
  pinMode(D10, INPUT);

  Serial.println("");
  Serial.println("Hello, Fab Academy");
}

void loop() {
  if(digitalRead(D10)){
    while(digitalRead(D10)){ 
      delay(10);
    }
    state=!state;
    delay(10);
  }
  digitalWrite(D2, state);
  delay(10);
}