LCD 4seg e 15 minutos

  unsigned long previousMillis = 0;
  unsigned long currentMillis = 0;
  int cont = 1;

  unsigned int Control = 0;
   unsigned int Level = 1;
    #include <Wire.h>
    #include <LiquidCrystal_I2C.h>
  //  Inicializa o display no endereco 0x27
    LiquidCrystal_I2C lcd(0x27,2,1,0,4,5,6,7,3, POSITIVE);

//  #include <LiquidCrystal.h>
//  LiquidCrystal lcd(12, 11, 7, 6, 5, 4);

  void setup() {
     lcd.begin(16,2);

   // initialize digital pin 13 as an output.
    pinMode(13, OUTPUT);
    lcd.clear();
    currentMillis = millis();
  }

  void loop()
  {
    if ((millis()-currentMillis>=4000) && (Level == 1))
    {
        lcd.clear();
        lcd.setCursor(2,0);
        lcd.print ("Temp: 26C");
        Level = 2;
        Control++;
        currentMillis = millis();
    }
     if ((millis()-currentMillis>=4000) && (Level == 2))
    {
        lcd.setCursor(2,1);
        lcd.print ("Umid: 97%");
        Level = 3;
        Control++;
        currentMillis = millis();
    }
    if ((millis()-currentMillis>=4000) && (Level == 3))
    {
        lcd.clear();
        lcd.setCursor(2,0);
        lcd.print ("Hora: 09:34");
        Level = 4;
        Control++;
        currentMillis = millis();
    }
    if ((millis()-currentMillis>=4000) && (Level == 4))
    {
        lcd.setCursor(2,1);
        lcd.print ("Data: 28/12/2015");
        Level = 1;
        Control++;
        currentMillis = millis();
    }
    if (Control >=225)    // 4.000*225 = 900.000
 //   if (Control >=10)    // 4.000*10 = 40.000 40 segundos
    {
        lcd.clear();
        lcd.setCursor(2,0);
        lcd.print ("Grava SD");
        Control = 0;
        Level = 1;
        currentMillis = millis();
    }

    digitalWrite(13, HIGH);   // turn the LED on (HIGH is the voltage level)
    delay(500);              // wait for a second
    digitalWrite(13, LOW);    // turn the LED off by making the voltage LOW
    delay(500);
  }