int trigpin = 4;
int echopin = 5;
float duration, distance;

void setup() {
  Serial.begin (9600);
  pinMode(trigpin, OUTPUT);
  pinMode(echopin, INPUT);
}


void loop() {
  digitalWrite(trigpin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigpin, LOW);
  duration = pulseIn(echopin, HIGH);
  distance = 0.17 * duration;


Serial.print("Distance = ");
Serial.print(distance);
Serial.println(" cm");
delay(1000);

}