Simple Clock with LED Matrix

/*
     Project:   Simple Digital Clock
     Hardware:  Arduino UNO R3 - RTC DS3231 - MAX72xx LED Matrix
     Version:   Rev 1.4
     Date:      26.Feb.2019
     Author:    LAGSILVA
     License:   CC BY-NC-ND 4.0
                (Attribution-NonCommercial-NoDerivatives 4.0 International)
*/

#include <LedControl.h>                 // Library for LED Matrix - MAX72XX
#include <Wire.h>                       // Library for DS1307RTC - Pins of Arduino UNO: A4 (SDA), A5 (SCL)
#include <DS3232RTC.h>
#include <Time.h>                       // Library for Time
#include <TimeLib.h>

#define DS3232_I2C_ADDRESS 0x68         // I2C address (RTC)

// Global Variables
int lapse = 735;   // 735ms = (8000ms - 25ms * 5 * 8 * 2) / 8 - 15 = 750ms - 15(compensation value)

/*
  Pin numbers do Arduino para conexao com o MAX72XX (matriz de LED com controlador MAX72XX)
  pin 5 is connected to the DataIn (DIN)
  pin 6 is connected to LOAD (CS)
  pin 7 is connected to the CLK (CLK)
*/

LedControl lc = LedControl(5, 7, 6, 1);  // LedControl(int dataPin, int clkPin, int csPin, int numDevices)

// Array of Digits - 0 a 9 - Size 5x3

byte num[10][3] = {

  // Conventional Font type

  {0xF8, 0x88, 0xF8}, // 0
  {0xF8, 0x00, 0x00}, // 1
  {0xE8, 0xA8, 0xB8}, // 2
  {0xF8, 0xA8, 0xA8}, // 3
  {0xF8, 0x20, 0xE0}, // 4
  {0xB8, 0xA8, 0xE8}, // 5
  {0x38, 0x28, 0xF8}, // 6
  {0xF8, 0x80, 0x80}, // 7
  {0xF8, 0xA8, 0xF8}, // 8
  {0xF8, 0xA0, 0xE0}, // 9

};


void setup() {

  // Setup of Display "0"
  lc.shutdown(0, false);                // Wakeup Display "0"
  lc.setIntensity(0, 8);                // Set the Brightness of Display (0 to 15)
  lc.clearDisplay(0);                   // Clear Display "0"

  setSyncProvider(RTC.get);             // Function to read RTC (Real Time Clock)
  setSyncInterval(60);                  // Set the number of seconds between re-sync
  //setTime(19, 42, 00, 26, 02, 2019);    // Set the Time and Date
  //RTC.set(now());                       // Set the RTC time

}


void loop() {

  byte h, m, s, dd, mm, yy;
  long tC, tF;

  h = hour();
  m = minute();
  s = second();
  dd = day();
  mm = month();
  yy = year() % 100;

  // Plot Hour
  plotNum(h, 7);

  // Plot Minute
  plotNum(m, 6);

  // Plot Second
  plotNum(s, 5);

  // Plot Day
  plotNum(dd, 4);

  // Plot Month
  plotNum(mm, 3);

  // Plot Year
  plotNum(yy, 2);

  // Plot Temperature (C)    // Celsius degrees
  tC = RTC.temperature() / 4;
  plotNum(tC, 1);

  // Plot Temperature (F)    // Fahrenheit degrees
  tF = tC * 1.8 + 32;
  plotNum(tF, 0);

}


void plotNum (byte temp, byte stat) {

  byte tens = temp % 10;
  byte units = temp / 10;
  byte wd = weekday();

  wd = (9 - wd) % 7;

  if (wd == 0) {
    wd = 7;
  }

  for (byte i = 7; i >= 3; i--) {
    for (byte k = 0; k < 3; k++) {
      lc.setRow(0, k + 5, num[units][k] >> i);
      lc.setRow(0, k + 1, num[tens][k] >> i);
    }
    delay(25);
  }

  lc.setLed(0, stat, 0, true);            // Plot Status

  if (stat >= 2 && stat <= 4) {
    lc.setLed(0, wd, 1, true);            // Plot Weekday
  }

  delay(lapse);                           // Time delay between modes

  lc.clearDisplay(0);                     // Clear display

  for (byte i = 4; i <= 8; i++) {
    for (byte k = 0; k < 3; k++) {
      lc.setRow(0, k + 5, num[units][k] >> i);
      lc.setRow(0, k + 1, num[tens][k] >> i);
    }
    delay(25);
  }

}