https://spritesmods.com/?art=doom-bauble&page=1

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A Christmas tree bauble that plays Doom - Intro

Welcome

  * Hardware stuff
      + CP/M on an AVR
      + Connecting an LCD to a non-video-capable Linux device
      + AVR-based FM-transmitter
      + En Garde, a classifying capacitive touch sensor
      + GameBoy Advance as a MIDI synthesizer
      + Quizshow buttons on the cheap
      + Wall-lighting with RGB-leds
      + Extreme Vectrex multicart
      + Dekatron as Internet speed indicator
      + Wav-playing doorbell
      + FT2232H NAND flash reader
      + Using a tiny HC32L110 ARM chip
      + Macintosh SE/arm
      + USB Minecraft portal
      + A tiny Pinball Fantasies table
      + Scanner CCD touchscreen conversion
      + Tiny PDP11
      + Linux-based clock radio
      + Raspberry Pi micro arcade machine
      + Virtual Wii Sensor-bar
      + Black Widow in an FPGA
      + A Christmas tree bauble that plays Doom
      + Wifi E-ink display
      + Miniature Macintosh Plus
      + Standalone JTAG programmer
      + WS2812 LEDs controlled by an iMX233
      + Duplicating the SRI magnet micro-robots
      + Adding SATA and PCIE to a HP T5325 thin client
      + Thermochromic paint clock
      + 3d Jello printer
      + Solari ledboard controller
      + Restoring a VFD
      + Real HID for Xbox-controller
      + Electronic Stamp
      + Stealth DDR-mat
      + Mechanical webpage hitcounter
      + Run an uC from an AA-battery
      + Temperature led for Weller WTCPs
      + Automatic baudrate converter
      + NoveMini
      + Toilet terror alert
      + 96x48 LED-board
      + Controllable bristlebot
      + Knock to open
      + Electronic minimalism
      + RGB ledlamp
      + Online whiteboard
      + Clock using a fan and a LED
      + Electronic beer tallier
      + Rocket acceleration logger
      + Simple VFD-controller
      + CM: Yamaha Renewed
  * Hacks
  * Console hacking
  * Security
  * Software
  * Nabaztag
  * About Spritesmods

Page 1
Intro

Page 2
The hardware

Page 3
The Software

Page 4
The case

Page 5
Conclusion (+ discussion / remarks)

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Intro

Christmas is coming again, and generally that means christmas trees
and everything in it: lights, streamers, and ofcourse baubles. The
holiday is all very jolly and everything, so I decided it was lacking
some doom... errm, I mean Doom. So I 3d-printed a small Christmas
bauble modeled on an IBM PC, stuffed it with the tiniest LCD I could
find, added a processor and the logic to make it work as well as a
battery. This thing can hang in your Christmas tree and show the Doom
demo mode, including the audio effects and the sound track. And best
of all: if you pair a random BLE keyboard or joystick to it, you can
play and kill millimeter-sized zombies, shotgun guys and imps.

Read on for the details on how I made this.

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