const int Trig = 4;
const int Echo = 5;
 
void setup() {
   Serial.begin(115200);
   pinMode(Trig, OUTPUT);
   pinMode(Echo, INPUT);
}
 
void loop() {
   int cm = ping(Trig, Echo);
  Serial.print("");
   Serial.println(cm);
   delay(1000);
}
int ping(int Trig, int Echo) {
   long duration, distanceCm;   
   digitalWrite(Trig, LOW);
   delayMicroseconds(4);
   digitalWrite(Trig, HIGH);
   delayMicroseconds(10);
   digitalWrite(Trig, LOW);
   dur = pulseIn(Echo, HIGH);
   distanceCm = dur * 10 / 294/ 2;
   return dist;
}