int trig = 10;
int echo = 11;


void setup() {
  // put your setup code here, to run once:
  pinMode(11, INPUT);
  pinMode(10, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  delay(500);
  // put your main code here, to run repeatedly:
  long duration, distance;
  digitalWrite(trig, LOW);
  delayMicroseconds(2);
  digitalWrite(trig, HIGH);
  delayMicroseconds(10);
  digitalWrite(trig, LOW);
  duration = pulseIn(echo, HIGH);
  distance = (duration / 2) / 29.1;
  Serial.println(distance);

  
}