int PIN_TRIG 17;
int PIN_ECHO 15;
void setup() 
{
Serial.begin(115200);
pinMode(PIN_TRIG, OUTPUT);
pinMode(PIN_ECHO, INPUT);
}
void loop() 
{
digitalWrite(PIN_TRIG, HIGH);
delayMicroseconds(10);
digitalWrite(PIN_TRIG, LOW);

int duration = pulseIn(PIN_ECHO, HIGH);
Serial.print("Distance in CM: ");
Serial.println(duration / 58);
 delay(1000);
}