#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2);
#define Tring 4
#define Echo 3
#define R 9 
#define G 10 
#define B 11 
long width , distance ;
void setup() 
{
 Serial.begin(9600);
 pinMode(Tring , OUTPUT);
 pinMode(Echo, INPUT);
 pinMode(R,OUTPUT);
 pinMode(G,OUTPUT);
 pinMode(B,OUTPUT);
 lcd.init();                       
 lcd.backlight();
}

void loop() 
{
  int dist = US_Reader ();
  lcd.init();
  lcd.backlight();
  lcd.setCursor(2,0);
  lcd.print("Distance is : ");
  lcd.setCursor(5,1);
  lcd.print(dist);
  lcd.print(" cm ");
  if(dist<50) 
  RGB(1,0,0);
  if (dist > 50 && dist<250)
  RGB(0,1,0);
  if (dist>250)
  RGB(0,0,1);
  delay(1000);


}
int  US_Reader () 
{
   digitalWrite(Tring , 0);
  delayMicroseconds(2);
  digitalWrite(Tring , 1);
  delayMicroseconds(10);
  digitalWrite(Tring , 0);
  width = pulseIn(Echo , 1);
  distance = width/58.2 ;
  return distance;
}

void RGB(int r , int g, int b) 
{
 digitalWrite(R,r);
 digitalWrite(G,g);
 digitalWrite(B,b);
}