long duration;
int distance;
void setup()
{
pinMode(11, OUTPUT); //trig
pinMode(9, INPUT); //echo
Serial.begin(9600);
}
void loop()
{
digitalWrite(11, LOW);
delayMicroseconds(2);
digitalWrite(11, HIGH);
delayMicroseconds(10);
digitalWrite(11, LOW);

duration = pulseIn(9, HIGH);
distance = (duration/2) / 29.1545;
Serial.print("DISTANCE: ");
Serial.println(distance);
//Serial.print("cm");
delay(1500);
}