Blinking lights

1/*
2  Blink
3
4  Turns an LED on for one second, then off for one  second, repeatedly.
5
6  Most Arduinos have an on-board LED you can control.  On the UNO, MEGA and ZERO
7  it is attached to digital pin 13, on MKR1000 on pin  6. LED_BUILTIN is set to
8  the correct LED pin independent of which board is  used.
9  If you want to know what pin the on-board LED is connected to on your  Arduino
10  model, check the Technical Specs of your board at:
11  https://www.arduino.cc/en/Main/Products
12
13  modified 8 May 2014
14  by Scott Fitzgerald
15  modified 2 Sep 2016
16  by  Arturo Guadalupi
17  modified 8 Sep 2016
18  by Colby Newman
19
20  This example  code is in the public domain.
21
22  https://www.arduino.cc/en/Tutorial/BuiltInExamples/Blink
23*/
24
25//  the setup function runs once when you press reset or power the board
26void setup()  {
27  // initialize digital pin LED_BUILTIN as an output.
28  pinMode(LED_BUILTIN,  OUTPUT);
29}
30
31// the loop function runs over and over again forever
32void  loop() {
33  digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the  voltage level)
34  delay(1000);                       // wait for a second
35  digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
36  delay(1000);                       // wait for a second
37}