// Set date and time using a DS1307 RTC connected via I2C
#include <Wire.h>
#include <SPI.h>  // not used here, but needed to prevent a RTClib compile error
#include "RTClib.h"
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 20, 4);  // set the LCD address to 0x27 for a 16 chars and 2 line display
RTC_DS1307 RTC;                      // Setup an instance of DS1307 naming it RTC

char sbuf[64];
char buf[64];

void setup() {
  pinMode(7, OUTPUT);
  Serial.begin(9600);  // Set serial port speed
  Wire.begin();        // Start the I2C
  lcd.init();          // initialize the lcd
  lcd.noBacklight();
  RTC.begin();                               // Init RTC
//  RTC.adjust(DateTime(__DATE__, __TIME__));  // Time and date is expanded to date and time on your computer at compiletime
  //    Serial.print('Time and date set');
  digitalWrite(7, LOW);
}

void loop() {
  DateTime now = RTC.now();

  sprintf(buf, "%02d/%02d/%02d", now.day(), now.month(), now.year()%2000);
  sprintf(sbuf, "%02d:%02d:%02d", now.hour(), now.minute(), now.second());

  Serial.print(buf);
  Serial.print(" ");
  Serial.println(sbuf);
  lcd.setCursor(0, 0);
  lcd.print(buf);
  lcd.setCursor(0, 1);
  lcd.print(sbuf);

  if (now.hour() == 20 && now.minute() == 15)
    digitalWrite(7, HIGH);
  if (now.hour() == 20 && now.minute() == 16)
    digitalWrite(7, LOW);
  delay(1000);
}