Arduino installation

#define TRIG_PIN 7

#define ECHO_PIN 8

void setup() {

  Serial.begin(9600);

  pinMode(TRIG_PIN, OUTPUT);

  pinMode(ECHO_PIN, INPUT);

}

void loop() {

  // Clear the trigger

  digitalWrite(TRIG_PIN, LOW);

  delayMicroseconds(2);

  // Send a 10 microsecond pulse to trigger

  digitalWrite(TRIG_PIN, HIGH);

  delayMicroseconds(10);

  digitalWrite(TRIG_PIN, LOW);

  // Read the echo pin: pulseIn returns duration in microseconds

  long duration = pulseIn(ECHO_PIN, HIGH);

  // Calculate the distance (duration / 2 because it goes to the object and comes back)

  float distance_cm = duration * 0.0343 / 2;

  Serial.print("Distance: ");

  Serial.print(distance_cm);

  Serial.println(" cm");

  delay(500);  // Delay between readings

}