const int trigP=10;
const int echoP=11;
long duration;
int distance;
void setup()
{
  pinMode(trigP,OUTPUT); 
  pinMode(echoP,INPUT);
  Serial.begin(9600);
}
  void loop()
{
    digitalWrite(trigP,LOW);
    delayMicroseconds(2);
    digitalWrite(trigP, HIGH);
    delayMicroseconds(10);
    digitalWrite(trigP,LOW);
    duration=pulseIn(echoP,HIGH);
    distance=duration*0.034/2;
    Serial.print("Distance=");
    Serial.println(distance);
    delay(500);
}