const int tri=19;
const int ec=18;
long duration;
float distance;

void setup(){

Serial.begin(115200);
pinMode(tri, OUTPUT);
pinMode(ec, INPUT);
}
void loop() {
distance=getdistance();
Serial.println("Distance: "+String(distance));
delay (1000);
}
long getdistance()
{
digitalWrite(tri, LOW);
delayMicroseconds(2);
digitalWrite(tri, HIGH);
delay (10);
digitalWrite(tri, LOW);
duration=pulseIn(ec,HIGH);
return(duration*0.034/2)+1;
}