What happens when you combine an Epson printer, a BASIC stamp microcontroller combined with a park zone Stoplight? Why, you get a pumpkin that pops up whenever trick-or-treaters come near your door:

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Automatic Halloween pumpkin instructions – Link.

DIY HALLOWEEN from MAKE & CRAFT!
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It’s here!! DIY HALLOWEEN 2007 from the editors of MAKE and CRAFT brings you 40-plus DIY projects for the holiday that’s made for makers. From the craftiest costumes to amazing animated props and the latest in computer-controlled haunted house effects – Link.