DIY Teatimer

Martin writes –

This is a short time timer made with an AT89C1051. It is supporting times from 1 minute to 12 minutes. You have been a lazy bone and now you have to work all night. So there is a need for strong tea. You start to make the tea, but you forget the time and it tastes: brrrr…

Teatimer – Link. Source and schematics included.