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#include <DS3231.h>
#include <Wire.h>
#include <LCD_I2C.h>

#define I2C1_SDA_PIN 2
#define I2C1_SCL_PIN 3

DS3231 myRTC(Wire1);

bool century = false;
bool h12Flag;
bool pmFlag;

LCD_I2C lcd(0x27, 16, 2);


void setup() {

  Serial.begin(115200);
  while (!Serial){};
  Serial.println("RTC DS 3231.");
  Wire1.setSDA(I2C1_SDA_PIN);
  Wire1.setSCL(I2C1_SCL_PIN);
  Wire1.begin();

  lcd.begin();
  lcd.backlight();

}

void loop() {

  lcd.print(myRTC.getYear(), DEC);
  lcd.print("-");
  lcd.print(myRTC.getMonth(century), DEC);
  lcd.print("-");
  lcd.print(myRTC.getDate(), DEC);

  lcd.setCursor(0, 1);
  lcd.print(myRTC.getHour(h12Flag, pmFlag), DEC);
  lcd.print(":");
  lcd.print(myRTC.getMinute(), DEC);
  lcd.print(":");
  lcd.print(myRTC.getSecond(), DEC);
  delay(1000);
  lcd.clear();

}