const int trigPin=13;
const int echoPin=12;
// ultrasonic declaration

void setup() {
  Serial.begin(115200);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  // ultrasonic setup code
}

void loop() {
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  int duration=pulseIn(echoPin,HIGH);
  int distance=duration*0.034/2;
  Serial.println(distance);
}