Difference between revisions of "ChromoDisk"

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m (Added more improvements)
m (Updated status with version 2 boards)
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... is a round PC board with 9 rings of 18 RGB LEDs each.  The microcontroller and other components that make it work are in the center.  The design is based upon the [[http://www.instructables.com/id/Aurora-9x18-RGB-LED-art/ Aurora Instructable]].  Since I've worked with AVRs, and this seems like an interesting introduction to PCB design with LEDs, I decided to redo the original to fit into a 100mm dia board for minimum cost.  I also designed it for a AA battery pack on the back side of the board.  We'll see how long it lasts with 162 LEDs!
 
... is a round PC board with 9 rings of 18 RGB LEDs each.  The microcontroller and other components that make it work are in the center.  The design is based upon the [[http://www.instructables.com/id/Aurora-9x18-RGB-LED-art/ Aurora Instructable]].  Since I've worked with AVRs, and this seems like an interesting introduction to PCB design with LEDs, I decided to redo the original to fit into a 100mm dia board for minimum cost.  I also designed it for a AA battery pack on the back side of the board.  We'll see how long it lasts with 162 LEDs!
  
Current status: Boards in, first prototype done (5 hours to assemble!), writing software for it.  Here's a demo of a simple program I wrote:
+
Current status: Version 2but boards arewere on theirthe way! Two samples using the version 1 prototype are done (5 hours to assemble!), writing software for it.  Here's a demo of a simple program I wrote:
  
 
[[Media:ChromoDiskProto.mp4|Demo of prototype]]
 
[[Media:ChromoDiskProto.mp4|Demo of prototype]]

Revision as of 03:01, 24 November 2011

The ChromoDisk aka ColorMesh v1

... is a round PC board with 9 rings of 18 RGB LEDs each. The microcontroller and other components that make it work are in the center. The design is based upon the [Aurora Instructable]. Since I've worked with AVRs, and this seems like an interesting introduction to PCB design with LEDs, I decided to redo the original to fit into a 100mm dia board for minimum cost. I also designed it for a AA battery pack on the back side of the board. We'll see how long it lasts with 162 LEDs!

Current status: Version 2but boards arewere on theirthe way! Two samples using the version 1 prototype are done (5 hours to assemble!), writing software for it. Here's a demo of a simple program I wrote:

Demo of prototype

File:Chromodisk1.sch

File:Chromodisk1.brd

File:ColorTest1.asm

File:ColorMesh.asm

Notes on Improvements:

  1. Improve power distribution. RESET pull-up is at the end of the line.
  2. Polarity of battery holder is reversed.
  3. Add ground plane.
  4. Pull-up on SCLK line affects programming.
  5. Need to current-limit base drive on Q1-Q9, else overheats CPU.
  6. Add 220uF cap to power supply to avoid programming problems.