int ledPin = 16; //Define LED pin connection to GPIO16
void setup() {
  Serial.begin(9600);// sets baudrate to 9600

  pinMode(ledPin, OUTPUT);//Set mode to output
}

void loop() {
  digitalWrite(ledPin, HIGH); //Output high level, turn on led
  Serial.println("LED ON!");
  delay(1000);//Delay 1000 ms
  digitalWrite(ledPin, LOW); //Output low level,turn off led
  Serial.println("LED OFF!");

  delay(1000);//Delay 1000 ms
}