#4.8.2.1. 예제 

void setup() {

  pinMode(8, OUTPUT);

  pinMode(9, OUTPUT);

  pinMode(10, OUTPUT);

  pinMode(11, OUTPUT);

  pinMode(12, OUTPUT);

}

void loop() {

  int moisture = analogRead(A0);

  digitalWrite(8, LOW);

  digitalWrite(9, LOW);

  digitalWrite(10, LOW);

  digitalWrite(11, LOW);

  digitalWrite(12, LOW);

  if (moisture < 200) {

    digitalWrite(12, HIGH);

  } else if (moisture < 400) {

    digitalWrite(11, HIGH);

  } else if (moisture < 600) {

    digitalWrite(10, HIGH);

  } else if (moisture < 800) {

    digitalWrite(9, HIGH);

  } else {

    digitalWrite(8, HIGH);

  }

  delay(100);

}