/* www.arduinopoint.com */
/* Degital 24 hour time format clock by Arduino, TM1637 4 digit 7 segment display and DS32321 RTC.*/

// Add libraries: RTClib and TM1637
#include "RTClib.h"
#include <TM1637Display.h>

// Define the connections pins for TM1637 4 digit 7 segment display
#define CLK 8
#define DIO 9

// Create rtc and display object
RTC_DS3231 rtc;
TM1637Display display = TM1637Display(CLK, DIO);

void setup(){
  // Begin serial communication at a baud rate of 9600
  Serial.begin(9600);
  Serial.println("Hallo");

  // Wait for console opening
  delay(3000);

  // Check if RTC is connected correctly
  if (! rtc.begin()) {
    Serial.println("Couldn't find RTC");
    while (1);
  }
  // Check if the RTC lost power and if so, set the time:
  if (rtc.lostPower()) {
    Serial.println("RTC lost power, lets set the time!");
    // The following line sets the RTC to the date & time this sketch was compiled:
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
    // This line sets the RTC with an explicit date & time, for example to set
    // January 21, 2014 at 3am you would call:
    //rtc.adjust(DateTime(2014, 1, 21, 3, 0, 0));
  }
    // Set the display brightness (0-7):
  display.setBrightness(5);
  // Clear the display:
  display.clear();
}

void loop(){
  // Get current date and time
  DateTime now = rtc.now();

  // Create time format to display:
  int displaytime = (now.hour() * 100) + now.minute();

  // Print displaytime to the Serial Monitor
  // Serial.println(displaytime);

  // Display the current time in 24 hour format with leading zeros enabled and a center colon:
  display.showNumberDecEx(displaytime, 0b11100000, true);

  // Remove the following lines of code if   you want a static instead of a blinking center colon:
  delay(1000);

  display.showNumberDec(displaytime, true); // Prints displaytime without center colon.

  delay(1000);

}