Dot matrix business card


Tom Ward, whose work will appear in The Best of Instructables book we’re currently editing, has just posted an awesome new “extreme business card.” It uses a matrix of 5×15 0603 LEDs driven by a PIC16F57 MCU. He says you can get the parts cost down to about $5 each in quantity. Not the kind of card you’d give out on street corners, but if you *really* want to impress somebody…

Dot Matrix Business Card

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Gareth Branwyn is a freelance writer and the former Editorial Director of Maker Media. He is the author or editor of over a dozen books on technology, DIY, and geek culture. He is currently a contributor to Boing Boing, Wink Books, and Wink Fun. His free weekly-ish maker tips newsletter can be found at

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