The ATtiny13 is small enough to be hidden inside a box of chocolates to create a pleasing blinking LED pattern when someone touches the box and sets off the rolling ball tilt sensor. The project uses a very small number of components and requires only basic soldering skills.
Charlieplexing is used to drive up to 12 LEDs via 4 I/O pins of the ATtiny13. The original project and the software are based on 10 but it's easy to increase the number of LEDs to 12. The ATtiny will go into power-down after every blinking cycle and battery life of several months can be expected from small batteries like LR44. (The same can't be said for your chocolates.) For more infomation about the project and to see the walk-through, visit the Jameco Workshop Page, and be sure to check out what others are saying about the Motion Sensing Pulsing LED project build!
Resources & DownloadsDetailed description, schematics and modification tips at elabz.com
Club Jameco Project #20307
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