#define  trig  16
#define  echo 17
long duration;
int distance;
 void setup()
 {
 pinMode(trig, OUTPUT);
 pinMode(echo, INPUT);
 Serial.begin(115200);
 }
 void loop()
 {
 digitalWrite(trig,LOW);
 delayMicroseconds(2);
 digitalWrite(trig,HIGH);
 delayMicroseconds(10);
 digitalWrite(trig, LOW);
 duration=pulseIn(echo,HIGH);
distance=duration*0.034/2;
 Serial.print("Distance:");
 Serial.println(distance  );
 
 
 }