// One line comment

/*
  multi line comment
*/

void setup() {
  pinMode(2, OUTPUT); // Blue
  pinMode(3, OUTPUT); // Green
  pinMode(5, OUTPUT); // Red
  
}

void loop() {
  digitalWrite(2, HIGH); // BLUE LED on
  delay(2000); // Dealy do nothin 1000ms = 1s
  digitalWrite(2, LOW); // BLUE LED off
  delay(2000); // Dealy do nothin 1000ms = 1s
}