arduu

void setup() {
  // initialize the LED pin as an output:
  pinMode(D5, OUTPUT);
  // initialize the pushbutton pin as an input:
  pinMode(D0, INPUT);
}

void loop() {

  // check if the pushbutton is pressed. If it is, the buttonState is HIGH:
  if (digitalRead(d0)== HIGH) {
    digitalWrite(D5, HIGH);
  } else {
    // turn LED off:
    digitalWrite(D5, LOW);
  }
}