This hefty clock uses classic bells and binary display – and it knows where you are!
The case measures about 15Ã—13×8 centimeters. The bells which I happened to have lying around are from a very old telephone and were the remains of my very first electronics project (which was about seven years ago).
The most remarkable feature of this alarm clock is the fact that it uses a microswitch mounted in my door to detect if I left my room. It can only be disabled when the door is open.