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);
}