#define LED_INTERNAL 32

// the setup function runs once when you press reset or power the board
void setup() {
  // initialize digital pin LED_BUILTIN as an output.
   Serial.begin(9600);
   pinMode(LED_INTERNAL, OUTPUT);
   Serial.println("Blink LED start");
}

// the loop function runs over and over again forever
void loop() {
  digitalWrite(LED_INTERNAL, HIGH);   // turn the LED on (HIGH is the voltage level)
  Serial.println("LED on");
  delay(1000);                       // wait for a second
  digitalWrite(LED_INTERNAL, LOW);    // turn the LED off by making the voltage LOW
  Serial.println("LED off");
  delay(1000);                       // wait for a second
}