#define buzzer 10
#define trigger 11
#define echo 12
#include <Wire.h>            
#include <LiquidCrystal_SR.h>
LiquidCrystal_SR lcd(6, 5, 9);// Pin 6 - Data Enable/ SER, Pin 5 - Clock/SCL, Pin 9 -SCK

float time=0,distance=0;
 
void setup()
{
 lcd.begin(16,2);
 pinMode(trigger,OUTPUT);
 pinMode(echo,INPUT);
 pinMode(buzzer,OUTPUT);
 lcd.print(" Virtual Eye");
 delay(2000);
}
 
void loop()
{
 lcd.clear();
 digitalWrite(trigger,LOW);
 delayMicroseconds(2);
 digitalWrite(trigger,HIGH);
 delayMicroseconds(10);
 digitalWrite(trigger,LOW);
 delayMicroseconds(2);
 time=pulseIn(echo,HIGH);
 distance=time*340/20000;
 if(distance<25)
 {
   digitalWrite(buzzer,1);
 }
 if(distance>25)
 {
   digitalWrite(buzzer,0);
 }
 lcd.clear();
 lcd.print("Distance:");
 lcd.print(distance);
 lcd.print("cm");
 delay(1000);
}