const int trigpin= 9;
const int echopin =10;

long duration;
float distance;
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);
delay(2000);
digitalWrite(trigpin, HIGH);
delayMicroseconds(10);
digitalWrite(trigpin, LOW);

//digitalWrite(trigpin,LOW);
duration=pulseIn(echopin, HIGH);
distance=duration * 0.034 / 2;
Serial.print("DISTANCE :");
Serial.print(distance);
Serial.println(" Cm");
delay(500);
}