#include <LiquidCrystal.h>

// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(15, 4, 16, 17, 18, 19);

const int ledR = 26;
const int ledG = 25;
const int ledB = 23;

int color = 0;

void setup() {
  lcd.begin(16, 2);
  lcd.print("Color:");

  pinMode(ledR, OUTPUT);
  pinMode(ledG, OUTPUT);
  pinMode(ledB, OUTPUT);

  Serial.begin(115200);
}

void loop() {
  if (Serial.available() > 0) {
    color = Serial.read() - '0';
    if (color >= 1 && color <= 5) {
      setColor(color);
      lcd.setCursor(7, 0);
      lcd.print("    ");
      lcd.setCursor(7, 0);
      lcd.print(color);
    }
  }
}

void setColor(int c) {
  analogWrite(ledR, 0);
  analogWrite(ledG, 0);
  analogWrite(ledB, 0);

  switch (c) {
    case 1:
      analogWrite(ledR, 255);
      break;
    case 2:
      analogWrite(ledG, 255);
      break;
    case 3:
      analogWrite(ledB, 255);
      break;
    case 4:
      analogWrite(ledR, 255);
      analogWrite(ledG, 255);
      break;
    case 5:
      analogWrite(ledR, 255);
      analogWrite(ledB, 255);
      break;
  }
}