int distance;
int time;
void setup() {
  Serial.begin(9600);
  pinMode(12,INPUT);//ECHO
  pinMode(13,OUTPUT);//TRIG
  // put your setup code here, to run once:

}

void loop() {
  digitalWrite(13,LOW);
  delay(1000);
  digitalWrite(13,HIGH);
  delay(1000);
  digitalWrite(13,LOW);
   time = pulseIn (12,HIGH);
   distance = 0.0346/2*time;
Serial.println(distance);
  delay(1000);
  
  // put your main code here, to run repeatedly:

}