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  • Author Author: genebren
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PiCasso Design Challenge - Kinetic Art Mobile - Post 5 - Finally a PCB design.

genebren

Prior posts in the PiCasso Design Challenge:

PiCasso Design Challenge - Kinetic Art Mobile - Post 1

PiCasso Design Challenge - Kinetic Art Mobile - Post 2

PiCasso Design Challenge - Kinetic Art Mobile - Post 3 - Will it go round in circles????

PiCasso Design Challenge - Kinetic Art Mobile - Post 4 - Crash of the Death Star

 

Things have been crazy here lately.  I have been very busy trying to finish out the interior of my new workshop, while attempting to keep my PiCasso project moving.  I have stuck in a re-design cycle, where I have been moving components from board to board, trying to get everything to fit, in a reasonable way.  After multiple re-starts on the design, I think I have a workable design.

 

There are several different requirements on the design that have made it fairly difficult to find the right approach.  Here are a few of them:

  • uniform LED spacing to allow proper illumination of the orb and to allow some 'animations' based on different LED color patterns and sequences.
  • relatively high power (LED and Fan power)
  • fan speed control (based on programmable constant current)
  • BLE transciever
  • Magnetic compass and accelerometer

 

I went through several trade off, trying to keep all of the high speed stuff on a single board, versus the space required for connectors should I distribute the components across multiple boards.  Here is what I ended up with:

imageimage

The Main PCB is riddled with 12 - 0.1" holes to allow additional air flow, through the board, into the fans below (there will also be some airflow around the board edges).  I will be trimming the PCB into a circle, as my PCB vendor (lower cost) only allows for rectangular boards.  The LED boards are sort of a universal design that will be connected to the main PCB, providing pairs of  LEDs along the circumference of orb and a single LED providing downward lighting (right angle mounted, hacked LED PCB).  This will provide me with 18 - fully programmable RGB LED to illuminate the sides and bottom of the orbs.

 

Here are the schematics of the main controller and LED board:

imageimage

image

 

I will need to send these boards of soon and order up parts for the board, but for now, I heading out to the workshop to install drywall and lighting.

 

Thanks for reading along.  I hope that I can get this project moving along a bit faster, so I can meet the deadlines.

 

Thanks,

Gene

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  • professional PCB design... Really!  Can I suggest something that has already created issues for me in the past?

    Well, I suppose you say yes image The idea of the holes for air flow is really great. The top left two holes, in my opinion, are too near to the border, so you risk that during the fabrication the PCB will be damaged as they make holes drilling the finished printed PCD (at least in most of the cases). As well as the same holes seem dangerously near to the PCB track.

     

    Enrico

Comment

  • professional PCB design... Really!  Can I suggest something that has already created issues for me in the past?

    Well, I suppose you say yes image The idea of the holes for air flow is really great. The top left two holes, in my opinion, are too near to the border, so you risk that during the fabrication the PCB will be damaged as they make holes drilling the finished printed PCD (at least in most of the cases). As well as the same holes seem dangerously near to the PCB track.

     

    Enrico

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