Hi all,

I've done a couple of Countdown timers with simple fistly with AT89C2051, then with Tiny2313 and finally with TIny4313. First one had 2 LED digits, second had 4 LED digits, while the last one had 2x8 small LCD.

This Timer has a big readout for setting time. One can set Minutes or Seconds with a selection with one button. See images below.

When the time is set Timer starts counting down with a press to Start button. Big display shows Seconds, while there is a small number that showd Minutes that remain to count down.

See image below.

 Video can be seen on youtube.