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Xander Hudson, aka Synoptic Labs, posted this cool heart card project to the MAKE Flickr pool. He writes:

This year I gave my sweetheart a LED valentines day card. The LEDs were animated with a pulse harmonic tuned to my own heartbeat. (sappy, yeah I know, but she makes me feel sappy). Incorporates 1 AVR ATTiny45 microcontroller driving 2 constant-current shift registers driving 16 LEDs.

Bill of Materials:
1 AVR ATTiny45 microcontroller
2 STP08DP05TTR 8-bit contsant current shift registers
16 red LED’s (0805 package)
Pyralux flexible circuit board material

Synoptic Labs

More:
LED Valentine’s Day heart

Gareth Branwyn

Gareth Branwyn is a freelancer writer and the former Editorial Director of Maker Media. He is the author or editor of a dozen books on technology, DIY, and geek culture, including the first book about the web (Mosaic Quick Tour) and the Absolute Beginner’s Guide to Building Robots. He is currently working on a best-of collection of his writing, called Borg Like Me.


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