void setup() 
{
  Serial.begin(9600);
  pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);
  
}


void loop() {
 
 digitalWrite(2, HIGH);
 delayMicroseconds(10);
 digitalWrite(2, LOW);
 int duration =pulseIn(3,HIGH);
 float Distance = (duration * 0,034)/2 ;
 Serial.println( Distance in CM: );
 Serial.println( Distance );
 delay(1000);

}