int trig = 11;
int echo = 10;


void setup() {
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT_PULLUP);
  Serial.begin(9600);
  // put your setup code here, to run once:

}

void loop() {

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

  int duration = pulseIn(echo,HIGH);
  // put your main code here, to run repeatedly:
  int distance = duration * 0.034 / 2;

  Serial.println(distance);

}