// give they a name:
int led1 = 13;
int led2 = 12;
int led3 = 11;
// the setup routine runs once when you press reset:
void setup() {
// initialize the digital pin as an output.
pinMode(led1, OUTPUT);
pinMode(led2, OUTPUT);
pinMode(led3, OUTPUT);
}
// the loop routine runs over and over again forever:
void loop() {
digitalWrite(led1, HIGH); // turn the LED on (HIGH is the voltage level)
delay(500); // wait for half second
digitalWrite(led2, HIGH); // turn the LED on (HIGH is the voltage level)
delay(500); // wait for half second
digitalWrite(led3, HIGH); // turn the LED on (HIGH is the voltage level)
delay(500); // wait for helf second
digitalWrite(led3, LOW); // turn the LED off by making the voltage LOW
delay(500); // wait for half second
digitalWrite(led2, LOW); // turn the LED off by making the voltage LOW
delay(500); // wait for half second
digitalWrite(led1, LOW); // turn the LED off by making the voltage LOW
delay(1000); // wait for half second
}