brainwagon

I’ve blogged about D. H. Lehmer’s factoring machines before. It’s fairly hard to convince those who aren’t pathologically interested in rather quirky bits of mathematics and computing that this collection of bicycle chains and sprockets is worthy of study, but I didn’t have much difficulty convincing my typical lunchtime companion Tom that they were interesting, [...]

This is one of the more impressive electronics hacks I’ve seen in a while: it uses an Atmel microcontroller as a replacement for an RFID chip in a very novel way (energy transmitted from the RFID reader powers the chip directly, no power on the microcontroller, so it is passive just like the RFID devices [...]