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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

Gareth Branwyn is a freelancer 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 for Boing Boing and WINK Books. And he has a new best-of writing collection and “lazy man’s memoir,” called Borg Like Me.


  • Green

    I don’t really think, that this project is really intended for beginners. It looks very simple, but all of the components are solder mounted, so there is a pretty good chance, that you could fry the chips.

    Of course, you could always substitute those chips with non-SMD chips.

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