// the setup function runs once when you press reset or power the board void setup() { // initialize digital pins as an output. pinMode(8, OUTPUT); pinMode(9, OUTPUT); pinMode(10, OUTPUT); pinMode(11, OUTPUT); } // the loop function runs over and over again forever void loop() { digitalWrite(8, HIGH); // turn the LED on (HIGH is the voltage level) delay(1000); // wait for a second digitalWrite(9, HIGH); // turn the LED on (HIGH is the voltage level) delay(1000); digitalWrite(10, HIGH); // turn the LED on (HIGH is the voltage level) delay(1000); digitalWrite(11, HIGH); // turn the LED on (HIGH is the voltage level) delay(1000); digitalWrite(8, LOW); // turn the LED off by making the voltage LOW digitalWrite(9, LOW); // turn the LED off by making the voltage LOW digitalWrite(10, LOW); // turn the LED off by making the voltage LOW digitalWrite(11, LOW); // turn the LED off by making the voltage LOW delay(1000); // wait for a second }