void setup() { // initialize digital pin 13 as an output. pinMode(7, OUTPUT); pinMode(3, INPUT); } // the loop function runs over and over again forever void loop() { digitalWrite(7, HIGH); // turn the LED on (HIGH is the voltage level) delay(1000); // wait for a second delay(1000); delay(1000); delay(1000); digitalWrite(7, LOW); // turn the LED off by making the voltage LOW delay(100); // wait for a second }