int trigpin =5;
 int ledPin = 22;
  int echopin =18;
#define SOUND_SPEED 0.034
#define CM_TO_INCH 0.393701
long duration;
float distanceCm;
float distanceInch;
void setup() 
{
Serial.begin(115200);
pinMode(trigpin, OUTPUT);
pinMode(echopin, OUTPUT);
pinMode(ledPin, INPUT);
} 

void loop() 
{
  for(int f=100;f>120;)
  {
 digitalWrite(trigpin, HIGH);
 delayMicroseconds(10);
 digitalWrite(trigpin, LOW);
 duration = pulseIn(echopin, HIGH);
 distanceCm = duration * SOUND_SPEED/2;
 distanceInch = distanceCm * CM_TO_INCH;
 Serial.print("Distance (cm):");
 Serial.println(distanceCm);
 Serial.print("Distance (inch):");
 Serial.println(distanceInch);
 delay(1000);
 digitalWrite (ledPin,HIGH);
 delay (300);
}

}