int trig=3;
int echo=2
long duration;
float distance;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);
}

long getdistance(){
  digitalWrite(trig.LOW));
  delayMicroseconds(2);
  digitalWrite(trig, HIGH);
  delayMicroseconds(10);
  digitalWrite(trig, LOW);

  duration=pulseIn((echo,HIGH);
  return(duration*.034/2);
}
void loop() {
  distance=getdistance();
  Serial.println(distance);
}