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                    /*
                    Blink
                  
                    Turns an LED on for one second, then off for one second, repeatedly.
                  
                    Most Arduinos have an on-board LED you can control. On the UNO, MEGA and ZERO
                    it is attached to digital pin 13, on MKR1000 on pin 6. LED_BUILTIN is set to
                    the correct LED pin independent of which board is used.
                    If you want to know what pin the on-board LED is connected to on your Arduino
                    model, check the Technical Specs of your board at:
                    https://www.arduino.cc/en/Main/Products
                  
                    modified 8 May 2014
                    by Scott Fitzgerald
                    modified 2 Sep 2016
                    by Arturo Guadalupi
                    modified 8 Sep 2016
                    by Colby Newman
                  
                    This example code is in the public domain.
                  
                    https://www.arduino.cc/en/Tutorial/BuiltInExamples/Blink
                  */
                  
                  // the setup function runs once when you press reset or power the board
                  void setup() {
                    // initialize digital pin LED_BUILTIN as an output.
                    pinMode(LED_BUILTIN, OUTPUT);
                  }
                  
                  // the loop function runs over and over again forever
                  void loop() {
                    digitalWrite(LED_BUILTIN, HIGH);  // turn the LED on (HIGH is the voltage level)
                    delay(1000);                      // wait for a second
                    digitalWrite(LED_BUILTIN, LOW);   // turn the LED off by making the voltage LOW
                    delay(1000);                      // wait for a second
                  }