Our Halloween costumes are just about ready to go, yet we can’t help but feel jealous after seeing this excellent electronic demon costume. What started out as a prank during a Google+ Hangout has turned into a full-fledged project, with the costume employing an Arduino-powered set of LED matrices, a voice changer, and two power sources. Add in some standard props for good measure, and you have a digital demon ready to scare unsuspecting adults and children alike. The video below delves into exactly what you'll need should you want to create your own version.