#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 );
}