viod setup()
{
pinMode(trigPin,output);
pinMode(echoPin,input);
serial.begin(9600);
}
void loop()
{
digitalWrite(trig pin,LOW);
delaymicroseconds(2);
digitalWrite(trig pin,HIGH);
delaymicroseconds(10);
digitalWrite(trig pin,LOW);
duration=pulseln(echoPin,HIGH);
distanceCm= duration*0.0340/2;
serial.print(distanceCm);
delay(1000);
}