#4.3.1.1. 예제 

int trigPin = 9;

int echoPin = 10;

void setup() {

Serial.begin(9600);

pinMode(trigPin, OUTPUT);

pinMode(echoPin, INPUT);

}

void loop() {

digitalWrite(trigPin, LOW);

delayMicroseconds(2);

digitalWrite(trigPin, HIGH);

delayMicroseconds(10);

digitalWrite(trigPin, LOW);

long duration = pulseIn(echoPin, HIGH);

float distance = duration * 0.0343 / 2;

Serial.print("Distance: ");

Serial.print(distance);

Serial.println(" cm");

delay(1000);

}