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Topic: 5x5x5 LED cube - video (Read 6 times) previous topic - next topic

Cranium


I guess that your cube is (as the one at instructables) can only light one LED per column/layer combination, resulting in a maximum number of 25 simultaneously lit LEDs, is that correct?


Technically speaking, all 125 LEDs could be lit simultaneously.  Any combination of transistors could be turned on or off at will.  However, in doing so, I would burn up the AVR as well as overload the 1/4w resistors being used to limit current.  But that is why multiplexing and persistence of vision is great. :) 

The code sets up an interrupt to control the turning on and off for me.  I can make it appear that all 125 leds are on at the same time but the code limits it to being just 5 at a time (one row).  This is, in effect, one led per column can be lit on the cube at the same time to ensure that the current limiting resistors are working correctly.


GnobarEl

Hi,
nice project you have.

Can you share your PCB schematics and components lists? I would like to try to build one too.

Thanks!

Cranium

Here is the Fritzing file I created for the project: http://www.mediafire.com/?n4wcun4zxn40oxz

Note that I added a 100nf capacitor across the incoming power since my original design and have reflected that in the file.  I also reduced the current limiting resistors from 82? to 68? to increase brightness a little.  There was also an issue with one of my traces being routed on the wrong layer requiring me to cut it and use a jumper on the underside.  That was also corrected in the file.

If you build this using my PCB design, you might want to increase the hole size for where the anodes attach to the PCB.  This will make it easier to put attach the cube to the PCB.  I've built 4 of these so far and have managed with needle nose pliers and patience though.

If you want one of my circuit boards, I still have a few and can sell you one for $12 shipped in the US.  Or if you want a parts kit with it , I can do that for $30 shipped in the US.  This would include:

  • 130 blue 3mm leds

  • 30 transistors (2N3904 or 2N4401 depending on what I have on hand)

  • 31-1k? 1% resistors

  • 5-68? 1% resistors

  • preprogrammed and tested ATMega328

  • 16MHz crystal

  • 2-22pF capacitors

  • 1-100nF capacitor

  • power connector

  • two sided solder masked PCB



j0nathanpae

That is so fascinating!!! This is exactly what I wanted to do. I'm currently a freshman in college learning all this as a computer engineering major. So, I don't really have the knowledge of the circuitry and programming, but I am getting there. I really want to make several 5x5x5 LED cubes for my friends as a christmas present! I'm just searching for the best instructions to work off of. I think this is perfect. I don't really have a XML reader for the link that you shared with the components list and PCB. Any suggestions? Also, would you mind if I asked a bunch of questions in the next few weeks about the construction of the cube? I sort of want to know what I will be doing before I do it.
Thank you!  :)

Cranium


That is so fascinating!!! This is exactly what I wanted to do. I'm currently a freshman in college learning all this as a computer engineering major. So, I don't really have the knowledge of the circuitry and programming, but I am getting there. I really want to make several 5x5x5 LED cubes for my friends as a christmas present! I'm just searching for the best instructions to work off of. I think this is perfect. I don't really have a XML reader for the link that you shared with the components list and PCB. Any suggestions? Also, would you mind if I asked a bunch of questions in the next few weeks about the construction of the cube? I sort of want to know what I will be doing before I do it.
Thank you!  :)


I suggest you start here: Instructables 4x4x4 cube (http://www.instructables.com/id/LED-Cube-4x4x4/) as I did.  If you want to open the file I included for my plan, click the Fritzing link and download it (free).   That is the format for the file. 

Funny, last weekend my son came over for the weekend from college to build one of these cubes.  He liked it and wanted one as well. 

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