#define BLUE 3
#define GREEN 5
#define RED 6


#include "SR04.h"
#include <Wire.h> 
#include <LiquidCrystal_I2C.h>
#define TRIG_PIN 12
#define ECHO_PIN 11
SR04 sr04 = SR04(ECHO_PIN,TRIG_PIN);
long a;
LiquidCrystal_I2C lcd(0x27, 16, 2);
void setup() {
  lcd.begin();
  lcd.backlight();
   Serial.begin(9600);
   delay(1000);


pinMode(RED, OUTPUT);
pinMode(GREEN, OUTPUT);
pinMode(BLUE, OUTPUT);
digitalWrite(RED, LOW);
digitalWrite(GREEN, LOW);
digitalWrite(BLUE, LOW);

}

int redValue;
int greenValue;
int blueValue;

void loop() {
#define delayTime 10 // fading time between colors


  lcd.clear();
   a=sr04.Distance();
   Serial.print(a);
   lcd.print(a);

   if (a>20 && a<30)
   {analogWrite(BLUE, 10);
   analogWrite(GREEN, 255);
   analogWrite(RED, 255);}
   else if (a<=20&&a>10)
   
   {analogWrite(BLUE, 255);
   analogWrite(GREEN, 10);
   analogWrite(RED, 255);}

   else if (a<=10&&a>0)
   {analogWrite(BLUE, 255);
   analogWrite(GREEN, 255);
   analogWrite(RED, 10);}

    else 
   {analogWrite(BLUE, 255);
   analogWrite(GREEN, 255);
   analogWrite(RED, 255);}
   
   Serial.println("cm");
  // lcd.println("cm");
   delay(100);