Arduino binary clock - V1

binary-clock-v1.ino

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Project name: Arduino LED matrix binary clock
Project page: https://electronza.com/arduino-led-matrix-binary-clock
Description:  This version shows each digit of the hours, minutes and seconds
              as a binary number
********************************************************************/

// Thus, 12:39:45 will be
// Hours
// 00000001
// 00000010
// Minutes
// 00000011
// 00001001
// Seconds
// 00000100
// 00000101

// Date and time functions using a DS1307 RTC connected via I2C and Wire lib
#include <Wire.h>
#include "RTClib.h"

// Library for 8x8B click
#include "LedControl.h"

// The 8x8 click board is placed in mikroBUS socket #1 
LedControl lc=LedControl(11,13,10,1);

// RTC settings

RTC_DS1307 rtc;
char daysOfTheWeek[7][12] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};


// Clock variables

// Look-up table to show binary values on the LED matrix 
int myBinaryDisp[] = {B00000000, B10000000, B01000000, B11000000, B00100000,
                      B10100000, B01100000, B11100000, B00010000, B10010000};
                      
bool is_second = false;

void setup() {

  // RTC Initialization
  if (! rtc.begin()) {
    while (1);
  }

  if (! rtc.isrunning()) {
    // Serial.println("RTC is NOT running!");
    // 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));
  }

  /*
   The MAX72XX is in power-saving mode on startup,
   we have to do a wakeup call
   */
  lc.shutdown(0,false);
  /* Set the brightness to a medium values */
  lc.setIntensity(0,4);
  /* and clear the display */
  lc.clearDisplay(0);
  
  // Set up interrupts
  interrupts();
  // If the RTC is placed in mikroBUS socket #2 the interrupt pin is D3
   attachInterrupt(digitalPinToInterrupt(3), onesecond, RISING);

  // CONFIGURE RTC for 1Hz square wave output
  rtc.writeSqwPinMode(SquareWave1HZ); 

  
}

void loop() { 
  if (is_second == true){
    update_display();
    is_second = false;
  }
}

// This function updates the LED matrix
void update_display (void){
  // Read the RTC
  DateTime now = rtc.now();
  
  // lc.clearDisplay(0);// clear screen
  // update hours
  // upper digit
  int hh = now.hour() / 10;
  lc.setColumn(0,0,myBinaryDisp[hh]);
  //lower digit 
  int hl = now.hour() % 10;
  lc.setColumn(0,1,myBinaryDisp[hl]);

  // update minutes
  // upper digit
  int mh = now.minute() / 10;
  lc.setColumn(0,3,myBinaryDisp[mh]);
  //lower digit 
  int ml = now.minute() % 10;
  lc.setColumn(0,4,myBinaryDisp[ml]);

  // update seconds
  // upper digit
  int sh = now.second() / 10;
  lc.setColumn(0,6,myBinaryDisp[sh]);
  //lower digit 
  int sl = now.second() % 10;
  lc.setColumn(0,7,myBinaryDisp[sl]);
}

// ISR routine
void onesecond() {
  is_second = true;
}