PMD Way Blog

With only two 555 timers and a whole bunch of LEDs, this small handheld creation produces mesmerizing effects

Delivering on the MPA's promise of "perfect" radio absorption, this energy harvester offers a dramatic boost to performance.

Tom Goff's metal detector updates classic design with extra adjustment.

Designed to quickly find bad chips from a bulk batch, this tester could prove handy for the vintage computing enthusiast in a hurry.

This LED wristwatch runs on joules, not jewels.

Self-balancing Arduino-controlled robotic devices

Designed for ease of use, this automated system tracks inventory via a barcode scanner — and ensures things go back in the right place.

Developed by a PhD student for studying insects when traditional approaches fail, this automated monitoring system is cheap and portable.

Rather than a simple photoresistor, this lighting control setup uses a camera module and the user's choice of PIL or OpenCV.