초음파 센서

소스 코드 예시

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); 
}