#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x027,20,4);

int pin_pots[] = {A0,A1,A2};

int pin_buttons[] = {13,12,8};

const int rgb_pins[] ={11,10,9};

int red_value=0;
int green_value=0;
int blue_value=0;

void setup() {
  // put your setup code here, to run once:
 lcd.begin(20,4);
 lcd.backlight();
 lcd.setCursor(0,0);

 for(int i=0;i<3;i++){
  pinMode(pin_buttons[i], INPUT_PULLUP);
 }

 for(int i=0;i<3;i++){
  pinMode(rgb_pins[i], OUTPUT);
 }

}

void loop() {
  // put your main code here, to run repeatedly:
  red_value = analogRead(A0);
  red_value = map(red_value,0,1023,0,255);
  lcd.setCursor(0,0);
  lcd.print("red: ");
  lcd.print(red_value);
  lcd.print("      ");
  analogWrite(rgb_pins[0],red_value);
}