const int trig=12;
const int echo=14;
float duration;
float distance;
void setup() {
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);
  Serial.begin(115200);
}
float getdistance()
{
digitalWrite(trig, LOW);
delayMicroseconds(2);
digitalWrite(trig, HIGH);
delayMicroseconds(10);
duration=pulseIn(echo,HIGH);
int distance = duration*0.03405/2;
Serial.println(distance);
}
void loop() {
  distance=getdistance();
  Serial.println("distance:"+String(distance));
  delay(3000); 
}