October 24, 2012 AT 5:41 pm

Electronic Demon Costume – How To! #electronichalloween

Have you ever done something silly on a lark and then found it was a big hit? So it went with a “beta test” Halloween idea on the Adafruit Show & Tell last week of my electronic demon costume. This video is a summary of what was done there… and what I’m now scrambling to finish properly before the big day! Video on YouTube (please subscribe!) and Vimeo.

The code for the LED mask with voice is in the adavoice repository on Github. This references the Wave Shield Voice Changer and Multiple LED Backpack tutorials.

Some updates since this was shot: a Ustream chat participant during Show & Tell suggested using a paintball mask as a base. I’m currently working on the faux ribcage idea… there may be enough space to move most of the electronics there and have just batteries in the pack. We shall see!


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  1. UPS says they’ll deliver my parts today… I may be able to include some aspects of this in my costume. this is awesome work phil!

    How are you shaping the rib cage?
    I’ve found that many paint cans these days are made of ABS plastic and can be readily cut and heat formed.

  2. Hey Jerry. Thanks!

    The ribcage material is Sintra™ aka foamed PVC. Sign and plastic shops sometimes sell it. Strong, lightweight, cuts like butter on a scroll saw, shapes nicely with a heat gun on medium setting (not too high or it releases death fumes).

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