int trig = 2;
int echo = 3;

void setup() 
{
Serial.begin(9600);
pinMode(trig,OUTPUT);
pinMode(echo,INPUT);
}


void loop() 
{
digitalWrite(trig, LOW);
digitalWrite(trig,HIGH);

delayMicroseconds(10);
digitalWrite(trig,LOW);

float dur = pulseIn(echo,HIGH);
float dis = (dur * 0.0343)/2;

Serial.print("Distance in cm:");
Serial.println(dis);
}