int echopin = 3;
int trigger = 2;
int time;
int distance;

void setup() {
  // put your setup code here, to run once:
  pinMode(echopin, INPUT);
  pinMode(trigger, OUTPUT);
  Serial.begin(9600);
  Serial.println("...Ultrasonic distance...");
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(trigger, LOW);
  digitalWrite(trigger, HIGH);
  time = pulseIn(echopin, HIGH);
  distance=time*0.0172;
  Serial.print("Time :");
  Serial.print(time);
  Serial.print(" microseconds ");
  delay(1000);
  Serial.print(", distance:");
  Serial.print(distance);
  Serial.println("cm");
  delay(1000);
}