아두이노 교육4일차 초음파 센서를 통한 거리측정

long duration, Cm, In;

void setup() {
  Serial.begin(9600);
  
  pinMode(9, INPUT);
  pinMode(10, OUTPUT);
  
  digitalWrite(10, LOW);
}

void loop() {
  digitalWrite(10, HIGH);
  delayMicroseconds(10);
  digitalWrite(10, LOW);
  duration = pulseIn(9, HIGH);
  
  Cm = duration / 29.1 / 2;
  In = duration / 74 / 2;
  
  Serial.print("Cm = ");
  Serial.print(Cm);
  Serial.print("  , In = ");
  Serial.println(In);
  
  delay(100);
}