Blink Led

This is a basic operation, but you need to start small to figure out the more complicated.

This is an example of code in order to see the flashing green led on the Arduino board.

Turns on an LED on for one second, then off for one second, repeatedly.

This example code is in the public domain.

void setup() {  // initialize the digital pin as an output.
// Pin 13 has an LED connected on most Arduino boards:
  pinMode(13, OUTPUT); 

void loop() {
  digitalWrite(13, HIGH); // set the LED on
  delay(1000); // wait for a second
  digitalWrite(13, LOW); // set the LED off
  delay(1000); // wait for a second

In the “setup” it set the pin 13 of the board as an output

In the “loop” the led blink in cycles 1 second long [delay(1000)=1000ms=1s]

“digitalWrite” goes to write in the output an high or low signal of +5V or 0V.