Valentine LED Chaser

The object of your desire will not be able to resist this heart shaped kitsch-o-tron, lovingly hand-crafted on perfboard with a CD4017B decade counter and 555 astable. But you probably can't go wrong with flowers and chocolates as well. Just to be on the safe side. Kits now available from Tindie!

Bug Shaped Solar Robot

Powered by a solar panel, this miniature robot shuffles towards the light.

Animated LCD Name Tag

While we are on the subject of calculators, this one has been ever so slightly -- what is the word? -- doctored for use as an animated name plate. The perfect desk toy for a nutty scientist.

Flickery LED Bar Candle

Perhaps the world has no need for another blinky LED candle effect. But with Halloween coming up, I was still in the mood for repurposing logic chips.

Hacky Random Number Generator / Cat Toy

For my entry to the Dangerous Prototypes 7400 Contest, I decided to make a true random number generator. In particular, I wanted a latching RNG — not merely a continuous stream of numbers, but a continuous stream which I could sample at intervals. The circuit would be made up of a minimal number of digital logic parts. And deliberately inducing noise into the digital circuit would involve breaking all the usual design rules, which is fun.