#include  <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <DHT.h>
#include <Keypad.h>

LiquidCrystal_I2C lcd(0x27, 20, 4);


#define DHTPIN 5     
//#define DHTTYPE DHT11   // DHT 11
#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321
//#define DHTTYPE DHT21   // DHT 21 (AM2301)
DHT dht(DHTPIN, DHTTYPE);

const byte ROWS = 4; //four rows
const byte COLS = 4; //three columns
char keys[ROWS][COLS] = {
    {'1', '2', '3', 'A'},
    {'4', '5', '6', 'B'},
    {'7', '8', '9', 'C'},
    {'*', '0', '#', 'D'}
};
//byte rowPins[ROWS] = {11, 10, 9, 8}; //connect to the row pinouts of the keypad
//byte colPins[COLS] = {7, 6, 5, 4}; //connect to the column pinouts of the keypad
byte rowPins[ROWS] = {13, 12, 11, 10}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {9, 8, 7, 6}; //connect to the column pinouts of the keypad
Keypad teclado = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );

float tmax, tmin, hmax, hmin;


const int clave = 135;

int introPassword(void)
{
  int numDigitos = 3;
  int valor = 0;
  lcd.setCursor(0,0);
  lcd.print("   Introduzca");
  lcd.setCursor(0,1);
  lcd.print("contrase");
  lcd.print((char)155);
  lcd.print("a = ");
  while(numDigitos > 0)
  {
    
    char tecla = teclado.getKey();
    if(tecla)
    {
      valor = valor*10 + (tecla-48);
      lcd.print('*');
      delay(100);
      numDigitos--;
    }
  }
  return valor;
}

//************ medida de la humedad relativa **********************
void humedad(void)
{
  float h = dht.readHumidity();
  if (isnan(h)) 
  {
    lcd.clear();
    lcd.print("Failed to read from DHT sensor!");
    return;
  }
  if(h > hmax)
    hmax = h;
  if(h < hmin)
    hmin = h;
  lcd.setCursor(0,2);
  lcd.print("Humedad: ");
  
  lcd.print(h,1);
  lcd.print(" %");
  //delay(2000);

}
//*****************************
void temperatura(void)
{
  float t = dht.readTemperature();

  if (isnan(t)) 
  {
    
    lcd.print("Failed to read from DHT sensor!");
    return;
  }
  if(t > tmax)
    tmax = t;
  if(t < tmin)
    tmin = t;
  lcd.setCursor(0,1);
  lcd.print("Temp. = ");
  lcd.print(t, 1);
  lcd.print((char)32);
  lcd.print((char)223);
  lcd.print("C");
  
}
void ver_tmaxMin(void)
{
  lcd.clear();
  lcd.setCursor (0,0);
  lcd.print("Tmax = ");
  lcd.print(tmax, 1);
  lcd.print((char)32);
  lcd.print((char)223);
  lcd.print("C");
  lcd.setCursor(0,1);
  lcd.print("Tmin = ");
  lcd.print(tmin,1);
  lcd.print((char)32);
  lcd.print((char)223);
  lcd.print("C");
  delay(2000);
  lcd.clear();
}
void menu(void)
{
  lcd.clear();
  lcd.print("Temper.- humedad: 1");
  lcd.print(" Humedad max-min: 3");
  lcd.print(" Temper. max-min: 2");
  char tecla = teclado.getKey();
  switch(tecla)
  {
    case '1':
      temperatura();
      humedad();
      break;
  }
}
void setup() 
{
  dht.begin();
  float temperatura = dht.readTemperature();
  float humedad = dht.readHumidity();
  if(isnan(temperatura) || isnan(humedad))
  {
    lcd.clear();
    lcd.print("Fallo sensor DHT");
    while(1);
  }
  else
  {
    tmax = temperatura;
    tmin = temperatura;
    hmax = humedad;
    hmin = humedad;
  }
  
  lcd.init();
  lcd.backlight();
}



void loop() 
{
 
 int passWord = introPassword();
 if(passWord == clave)
 {
  
  while(1)
  {
   lcd.clear();
   temperatura();
   humedad();
   delay(1000);
   char tecla = teclado.getKey();
   if(tecla);
   {
    if(tecla == '1')
      ver_tmaxMin();
   } 
  }
 }
 
  
  //delay(1000);
  

}