ANP 12/24 hours LED clock

From www.josepino.com - Almost No Parts LED Clock using a microcontroller PIC 16F84A and a few components.
Features:
Can use common cathode or common anode 7-segment LED displays.
Displays time as 12 hours or 24 hours format.
Allows to enable or disable the display for battery-operated circuits.
Can control the display brightness to reduce power consumption
7-segment LED displays are charlieplexed to reduce I/O ports usage.
PM LED indicator (optional)
Only 10 parts needed: 1 PIC 16F84A, 2 22pF Capacitors, 2 n.o. switches, 1 4Mhz Xtal and 4 CA or CC 7segment LED displays.
Operates from 2.5 to 5.5 Volts, it can even work with a 3V coin battery
NOTE: The display shows some glitches because the frequency of the video doesn't match with the frequency of the display. It works very well the project itself. Also, 7-segment red displays will be brighter than green displays. For more details about this project, visit: www.josepino.co...
Music: Vivaldi - Concerto for Mandolin & Orchesta in C Major: Allegro.

[@jakotelsa]

It would be great if you include an alarm feature

[@jhonny4036]

HELLO JOSE PINO.
I want to thank you for the programs you have on your site (blog).
Now I propose an idea without offending all you have learned and copyright.
Might you attach the original code of the programs to understand how the program works, and in some cases change some things such as microcontroller, crystal, and so .........
Or would be better if you make tutorial videos on youtube explaining as is .. if there is not much hassle.
Greetings from Colombia.
and thank you very much for your attention and everything else.

[@w171]

the best circuit

[@basantapanigrahy277]

Hi dear sir i used 3 volt coin battery but it discharge in 1 month (Ap clock)

[@hmh3141]

thank u first
and second, the hex file does't work