const int trig=4;
const  int echo=2;
long duration;
int distance;

void setup() {
  
  Serial.begin(115200);
  pinMode(trig,OUTPUT);
  pinMode(echo,INPUT);
}

void loop(){
 digitalWrite(trig,LOW);
 delayMicroseconds(2);
 digitalWrite(trig,HIGH);
 delayMicroseconds(10);
 digitalWrite(trig, LOW);
 duration = pulseIn(echo,HIGH);
 distance=(duration*0.034/2)+1;
 Serial.println("distance"+String(distance));
}