const int trig = 33, echo = 25;


void setup() {
  Serial.begin(115200);
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);
}

void loop() {

  digitalWrite(trig, HIGH);
  delayMicroseconds(10);
  digitalWrite(trig, LOW);

  int duration = pulseIn(echo, HIGH);
  float cm = (int)(duration / 58.7);

  Serial.print("Distance in CM");
  Serial.println(cm);
  delay(10);
}