Swap_File in the Adafruit forums posted up about his incredibly well-documented Tron suit cosplay complete with color changing disc and voice changing helmet:
My Tron suit costume is complete and was shown at CONvergence 2013.
The Helmet is a inexpensive eBay motorcycle helmet with a 20×4 RGB backlight negative screen with serial backpack from a 16×2 (its not sold separately) and a microphone.
The Disc is made of black and frosted laser Cut Acrylic. Neodymium magnets hold it to the holster on my back, which is bolted through my leather jacket and through a backpack. I left the bottom two magnets out of the holster to aid in removal. The disc contains an Arduino Nano, Wixel, ADXL345 Accelerometer, TCS230 color sensor, 1450mAh 3S Turnigy LiPo, 16 outward facing LPD8806 RGB LEDs, and a 5v switching regulator.
The Jacket has 80 LPD8806 LEDs mounted onto checkout store pricing strip and adhered to the leather with 3M 969 adhesive transfer tape (its good stuff!). White cloth ribbon is used as a diffuser, and the back side of the clear cover is painted white.
Audio from the helmet is ran through two op amps, first a unity buffer, then one set up as a log amp, (both on a TS922, low voltage, rail to rail) and finally though a msgeq7. The analog sections are on their own 3.3v regulator to reduce noise. Automatic channel muting and more level adjusting is implemented in software.
User input is both from the Disc via another Wixel, and from a Wireless Wii Nunchuk (Memorex brand). A level converter is REQUIRED for a Nunchuk, without one a Nunchuk will eventually short out, likely taking your Arduino with it!
The jacket also pairs with my phone via a JY-MCU-HC-06 Bluetooth Radio. A Python script on my phone allows incoming text messages to change the helmet display and my colors. It also replies with a status message with basic statistics.
HAPPY HALLOWEEN! Each weekday this month we’ll be bringing you ideas and projects for an Electronic Halloween! Expect wearables, hacks & mods, costumes and more here on the Adafruit blog! Working on a project for Halloween this year? Share it with us on Google+, in the comments below, the Adafruit forums, Facebook, or Twitter— we’d love to see what you’re up to and share it with the world (tag your posts #ElectronicHalloween). Tune in to our live shows, Wearable Electronics with Becky Stern and Ask an Engineer, where Adafruit store discount codes are announced– get the most bang for your Halloween buck!