"LED_BUILTIN"
- Which indicates the builtin LED on the board
- Most Arduinos have an on-board LED which can be controlled.
- On the UNO, MEGA and ZERO it is attached to digital pin 13, on MKR1000 on pin 6.
pinMode(LED_BUILTIN, OUTPUT); // initialize digital pin LED_BUILTIN as an output.
digitalWrite(LED_BUILTIN, HIGH); // turn the LED on (HIGH is the voltage level)
digitalWrite(LED_BUILTIN, LOW); // turn the LED off by making the voltage LOW
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