int trigPin = 9;
int echoPin = 8;

long duraction, cm;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);

  digitalWrite(echoPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(echoPin, LOW);

  duraction = pulseIn(echoPin, HIGH); 
  cm = (duraction/2) / 29.1;

  Serial.print(cm); // выводим расстояние в сантиметрах
  Serial.println(" cm");

  delay(1000); // ставим паузу в 1 секунду
}