Arduino Clock | online marty

// by online marty https://youtu.be/sF5Yk7fkcbA

#include <FastLED.h>
#define NUM_LEDS 28
#define DATA_PIN 6

CRGB leds[NUM_LEDS];

int currentTimeHours = 16;
int currentTimeMinutes = 20 ;

int MaxBrightness = 255;
int red = MaxBrightness; // keep this like this, for changing colors
int green = 0;
int blue = 0;

int dif =  0;
int difco = 0;

 boolean if_in_array(int array[], int element);
 boolean if_in_array(int array[], int element) {
 for (int i = 0; i < 7; i++) {
      if (array[i] == element) {
          return true;
      }
    }
  return false;
 }

int turnon(int t[7], int digit){       //turn on leds that are required for that digit and turn other leds off
  for (int i = 1; i < 8; i ++){
      if (if_in_array(t,i)){

        leds[i-1 + digit*7].setRGB( red, green, blue);
        }
      else {
        leds[i-1+ digit*7] = CRGB::Black;
        }
    }
  }
//  array with the saved led positions for each digit from 0 to 9
int ref[10][7] = {{1,2,3,4,5,6},{1,6},{5,6,7,3,2},{5,6,7,1,2},{4,6,7,1},{5,4,7,1,2},{5,4,7,1,2,3},{5,6,1},{1,2,3,4,5,6,7},{1,2,4,5,6,7}};

void setup() {
  FastLED.addLeds<WS2811, DATA_PIN>(leds, NUM_LEDS); }

void loop(){
  dif ++;             //this part is used for changing colors of the leds
  if (dif > MaxBrightness ){
      dif = 0;
      difco ++;
      if (difco > 3){
        difco = 0;
        }
    }
    if (difco == 0){
      red = MaxBrightness - dif;
      green = dif;}
    if (difco == 1){
      green = MaxBrightness - dif;
      blue = dif;}
    if (difco == 2){
      blue = MaxBrightness -dif;
      red = dif;}

 int minutes = millis() / 60000 ; // get number of minutes since the arduino is turned on
 minutes = minutes + currentTimeHours*60 + currentTimeMinutes; // this is used to set the current time
 int hours = minutes/60;
 minutes = minutes - hours*60;
 hours = hours - (hours / 24)*24;

 turnon(ref[minutes-(minutes/10)*10],0);
 turnon(ref[minutes/10],1);
 turnon(ref[hours-(hours/10)*10],2);
 turnon(ref[hours/10],3);
 FastLED.show();
 delay(1000); // change this, to control the speed of the changing colors
}