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LED Cube Pendant - Worlds Smallest LED Cube

Or: How small can makers make things

nqtronixnqtronix
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You&apos;ve seen LED cubes, they are everywhere, but this one is unique in it&apos;s size. The edge of this 4x4x4 is just about 1cm long, the total size including the epoxy casting and the driver circuitry is 13x13x37mm The LEDs are driven in a charlieplexed arrangement, which allows to group them in &quot;stacks&quot;. The custom, assembler optimized code can create true 24bit RGB colors at a flicker-less frame rate of 120hz. In addition to the ATMEGA328PB microcontroller the build includes a step-up converter, a LiPo charger IC, an accelerometer and a 1Mbit EEPROM. Right now the firmware is missing a few features I had planned. Do to time constraints I decided to publich the completed hardware as well as the fairly robust demo code. The whole project (including more hi-res images) is documented on <a href="http://inctructables.com" target="_blank">inctructables.com</a>, link down below.

iGA.2 - schematic XG7F.pdf

Schematic as .pdf

unknown - 140.28 kB - 01/27/2017 at 08:22

Preview

iGA.2 XG7F.dch

Diptrace 3.0 Schematic

dch - 510.52 kB - 01/27/2017 at 08:22

Download

iGA.3 XG7F.dip

Diptrace 3.0 PCB

dip - 385.19 kB - 01/27/2017 at 08:22

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iGA.3 XG7F_asy.dip

Diptrace 3.0 PCB incl. case parts

dip - 532.73 kB - 01/27/2017 at 08:22

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iGA.5 - BOM.csv

Bill of Materials, PCB mounted parts only, full list of materials on instructables.com

Comma-Separated Values - 1.29 kB - 01/27/2017 at 08:22

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zakqwy wrote 01/27/2017 at 16:21 • point

Crazy impressive soldering, well done! I love the PCB structure!

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nqtronix wrote 01/27/2017 at 17:41 • point

The PCB assembly worked even better then expected, it definitely will be my go to option for small builds like this :)

  Are you sure? yes | no

davedarko wrote 01/27/2017 at 10:28 • point

@Hari Wiguna - this is what I had in mind, when you we're doing your tiny RGB cube and I was saying stuff like "planning even smaller". My concept was only an idea and I don't think I would have ever done it, now definitely not :) 

This is great :)

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Hari Wiguna wrote 01/27/2017 at 13:51 • point

I totally agree! nqtronix did a fantastic job.  If you haven't already, check out his instructable.  There's a ton more detail there.

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