int trigpin = 12;
int echopin = 11;
int pingtraveltime;
float pingtravelDIS;
float DistensToTarget;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(trigpin, OUTPUT);
  pinMode(echopin, INPUT);

}

void loop() {
  digitalWrite(trigpin, LOW);
  delayMicroseconds(10);
  digitalWrite(trigpin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigpin, LOW);

  pingtraveltime = pulseIn(echopin,HIGH);
  pingtravelDIS=(pingtraveltime*0.0342);
  DistensToTarget=pingtravelDIS/2;

  delay(200);


  Serial.print("the distance of object is =");
  Serial.print(DistensToTarget);
  Serial.print(" cm.  =");
  Serial.print(DistensToTarget/2.54);
  Serial.println(" inch.");
  // put your main code here, to run repeatedly:

}