const int trig = 7;
const int echo = 6;


void setup() {
  // put your setup code here, to run once:
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);

  Serial.begin(9600);

}

void loop() {
  // put your main code here, to run repeatedly:

  digitalWrite(trig, HIGH);
  delayMicroseconds(20);
  digitalWrite(trig, LOW);

  unsigned long dueration =  pulseIn(echo, HIGH);

  float distance = dueration * 0.033 / 2.0;

  Serial.println(distance);


  delay(200);
  
}