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LED Cube Pendant - Worlds Smallest LED Cube

Or: How small can makers make things

nqtronixnqtronix
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You've seen LED cubes, they are everywhere, but this one is unique in it'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 "stacks". 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 inctructables.com, 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

Download

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!

  Are you sure? yes | no

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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