int Switch = PC13;
int LED = PA5;


void setup() {

  pinMode(Switch, INPUT_PULLUP);
  pinMode(LED, OUTPUT);

  Serial.begin(9600);
  Serial.println("Start");

}

void loop() {

  if (digitalRead(Switch) == LOW)
  {
    Serial.println("Pressed - PullDown");
    delay(150);
  }

  // digitalWrite(LED, LOW);
  // delay(500);
  // digitalWrite(LED, HIGH);
  // delay(500);
}