#include <Arduino.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd_i2c(0x27, 16, 2);

#define PinADC 34
#define Resolucion 3.3/4095
int rADC = 0;
int voltaje = 0;
int i=0;

#define pinin1 18
#define pinout 2
#define pinin2 19
#define pinin3 15

void setup() {

  Serial.begin(9600);
  analogReadResolution(12);
  analogSetPinAttenuation(PinADC, ADC_11db);
  lcd_i2c.init();
  lcd_i2c.backlight();

  pinMode(pinin1, INPUT_PULLDOWN);
  pinMode(pinout, OUTPUT);
}

void loop() {
  if(digitalRead(pinin1))
    i=1;
  else
  if(digitalRead(pinin2))
    i=2;
  else
  if(digitalRead(pinin3))
    i=3;
  else

  switch(i)
  {
    case 1:
      lcd_i2c.init();
      if(digitalRead(pinin1))
      {digitalWrite(pinout, HIGH);}
      else
      {digitalWrite(pinout, LOW);}
    break;
    case 2:
      rADC = analogRead(PinADC);
      lcd_i2c.init();
      lcd_i2c.setCursor(0,0);
      lcd_i2c.print("Valor: ");
      lcd_i2c.print(rADC);
      lcd_i2c.setCursor(0,1);
      lcd_i2c.print("Voltaje: ");
      lcd_i2c.println(rADC*Resolucion,2);
    break;
    case 3:
      lcd_i2c.init();
      lcd_i2c.setCursor(0,0);
      lcd_i2c.print("GORDO");
    break;
  }
}