#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <Encoder.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);  
Encoder enc(2, 3);                  

const int RED_PIN = 11;   
const int GREEN_PIN = 6; 
const int BLUE_PIN = 5; 
const int BUTTON_PIN = 9; 

int redValue = 0;
int greenValue = 0;
int blueValue = 0;
int currentColor = 0; // 
const int step = 15; 

void setup() {
  lcd.begin(16, 2);
  lcd.backlight(); 
  pinMode(RED_PIN, OUTPUT);
  pinMode(GREEN_PIN, OUTPUT);
  pinMode(BLUE_PIN, OUTPUT);
  pinMode(BUTTON_PIN, INPUT_PULLUP); 
  updateRgb();
  displayValues();
}

void loop() {
  static int lastPosition = -1;
  int position = enc.read() / step;
   
  if (position != lastPosition) {
    lastPosition = position;
    changeColorValue(position);
    updateRgb();
    displayValues();
  }
  
 
  if (digitalRead(BUTTON_PIN) == LOW) { 
    currentColor = (currentColor + 1) % 3; 
    while(digitalRead(BUTTON_PIN) == LOW); 
    delay(50); 
  }
}

void changeColorValue(int position) {
  if (currentColor == 0) { 
    redValue = constrain(position * step, 0, 255);
  } else if (currentColor == 1) {
    greenValue = constrain(position * step, 0, 255);
  } else if (currentColor == 2) { 
    blueValue = constrain(position * step, 0, 255);
  }
}

void updateRgb() {
  analogWrite(RED_PIN, redValue);
  analogWrite(GREEN_PIN, greenValue);
  analogWrite(BLUE_PIN, blueValue);
}

void displayValues() {
  lcd.clear();
  
  lcd.setCursor(1, 0);
  lcd.print("R: "); lcd.print(redValue);
  
  lcd.setCursor(1, 1);
  lcd.print("G: "); lcd.print(greenValue);
  
  lcd.setCursor(9, 1);
  lcd.print("B: "); lcd.print(blueValue);


  if (currentColor == 0) {
    lcd.setCursor(0, 0); 
    lcd.print(">");     
  } else if (currentColor == 1) {
    lcd.setCursor(0, 1); 
    lcd.print(">");      
  } else if (currentColor == 2) {
    lcd.setCursor(8, 1); 
    lcd.print(">");      
  }
}