Скачать или смотреть Electronic Wall Clock

An LED wall clock I made for myself in my spare time over nearly a year and completed just before Christmas. Shown here ticking over from Christmas eve to Christmas day.
Powered by spent batteries from my daughters leapster explorer. Current draw is minimal so it should last for months.
It uses the atmega328 and 3 shift registers for the LED's and a DS1302 RTC chip with battery backup. Power saving is achieved using inbuilt power saving modes of the micro plus timer 2 interrupts for the LED brightness . The LED's are dimmed in evening and night mode to further save power and extend the running time from the batteries. The micro is running from a 32kHz clock crystal to to reduce the number of power consuming clock cycles that are executed.
There's another shift register controlling an LCD display UI that is enabled via touch buttons. The system runs at 3.3v.