Snowflake PCBs…

The PCBs showed up very quickly. Here are front and back pictures of them.




They look pretty nice and have holes in all the right places. Because of the design, I need to cut them apart by hand.

I used my Dremel osciallating multi-tool, but frankly I think the normal Dremel would be a better choice.

That gave me a pile of parts:


Next, it was time to assemble the pieces. If everything was exactly sized, all the parts should have fit together perfectly. As it was, I had a few protrusions to file down and then I needed to file most of the pieces to get them to fit together. Took about half an hour.

And then, the first view of the snowflake board assembled.


The *plan* was that there would be copper right to the edges of the boards, and then they could just be soldered together.

What the fab *did* was pull the copper back from the edge by a little bit, so there was a gap between each of the pads that I needed to solder together. The power and ground pads are pretty big, and I could easily bridge them with a bit of bare copper wire.

The signal lines were another matter. The pads are much smaller, and with the copper lost by the fab, I just had a hairline of pad to solder to. I ended up using very fine wires to bridge the gap, putting the super-fine tip on my Hakko, and very carefully soldering the wires on. It was pretty exacting work, but it got easier over time.


The design was perfect except for a missing via that leaves a broken connection to the Vcc line. I fixed it with a short bit of red insulated wire.

I ordered a new hot air rework station so that I can reflow the WS2812 LEDs onto the PCBs, and I’m going to use that to solder all the little jumper wires that way.

While I wait for the new tools to show up, I’m going to write some code.

So, what do you think ?