const int echo=14;
const int trig=12;
float distance;
float duration;

void setup()
{
  Serial.begin(115200);
  pinMode(trig, OUTPUT);
  pinMode(echo,INPUT);
}
float getdistance()
{
  digitalWrite(trig, LOW);
  delayMicroseconds(2);
  digitalWrite(trig,HIGH);
  delayMicroseconds(10);
  digitalWrite(trig, LOW);
  duration = pulseIn(echo,HIGH);
  return{duration*0.034/2};
}
void loop()
{
  distance=getdistance();
  Serial.println("distance:"+String(distance));
  Serial.println("<---------------------->");
  delay((2000));
}