about 64 modes for clock background, 4 display modes:
- demo mode, background changing every 20s, and seconds clock hand step by 1/4s
- standard mode, one background all the time, change only by remote control, and seconds clock hand step by 1/4s
- standard mode with seconds clock hand step by 1s
- time setting mode
mcu: ATmega128A, motor drv: TDA5140A, rtc: DS1307.
https://www.youtube.com/watch?v=bJ0jKmULNsA
based on: https://www.elektroda.pl/rtvforum/topic1421623.html