Tonight I thought I'd build my Vetinari clock. It's a silly thing, but great fun.
Lord Vetinari is a character in the Discworld series of books by the now sadly deceased Sir Terry Pratchett. Vetinari, a powerful ruler of the largest city on the Discworld, has a clock in his waiting room which is designed to unnerve people by ticking irregularly. However, it still keeps accurate time.
You can get a kit of parts to convert any quartz controlled clock into a Vetinari clock. It uses a PIC microcontroller to generate a sequence of 32 pulses of different lengths which give the appearance of randomness. But the clock still keeps time accurately.
I ordered mine a way back and, after my expensive trip to Ikea on Sunday, I finally got a clock mechanism I thought worthy of the conversion. Tonight I put it together and carefully connected the outputs from the circuit to the driver coil in the clock mechanism. It works a treat. If you are a fan of Discworld who likes soldering you might have some fun with this.
Hmm. Perhaps a video of the clock would make more sense....