#4.9.1.1. 예제 

void setup() {

    pinMode(7, OUTPUT);

    pinMode(8, OUTPUT);

    pinMode(9, OUTPUT);

    pinMode(10, OUTPUT);

    pinMode(11, OUTPUT);

    pinMode(12, OUTPUT);

    pinMode(13, OUTPUT);

}

void loop() {

    digitalWrite(7, 0);

    digitalWrite(8, 1);

    digitalWrite(9, 1);

    digitalWrite(10, 1);

    digitalWrite(11, 1);

    digitalWrite(12, 1);

    digitalWrite(13, 1);

}