/*
* Blink
* Turns on the onboard LED on for one second, then off for one second, repeatedly.
* This uses delay() to pause between LED toggles.
*/
void setup() {
pinMode(BUILTIN_LED, OUTPUT); // initialize onboard LED as output
}
void loop() {
digitalWrite(BUILTIN_LED, HIGH); // turn on LED with voltage HIGH
delay(1000); // wait one second
digitalWrite(BUILTIN_LED, LOW); // turn off LED with voltage LOW
delay(1000); // wait one second
}