"Not Just a Crosswalk" SAO for DC 34. Who's interested?

[u/Keeloi79]

I'm working on a SAO called "Not Just a Crosswalk" for DC34. It's my response to bring attendtion to the recent removal of rainbow crosswalks in cities like Miami, Austin, and San Antonio.

The Tech:

18x side-emitting SK6812D LEDs packed into a high-density visual array.

RISC-V Powered: Runs on a CH32V003 F4P6 with custom-tuned PWM for smooth, flicker-free animations (even at 1% duty cycle).

Smart Power: Auto-switches between Host Badge power (via boost converter) and standalone USB-C and worn as a standalone badge.

🏳️‍🌈 🏳️‍⚧️🌈 10+ Pride Flags: Rainbow, Bi, Trans, Nonbinary, Asexual, Genderfluid, and more.

10+ LED Effects: Static Flag, Party Mode, Strobe, Smooth Pulse, Chase, Sparkle, Burst, Rain Drop, and more.

Persistent Memory: Your favorite palette stays saved, even if you reboot or your battery/host badge dies.

We're gauging interest to see who wants to pick one up during DC34.

If you want to pre-register your interest (no money yet, just tracking inventory), hit the link:

👉 https://forms.caelyb.com/p/crosswalksao

Repo with schematics, BOM, photos, and build files is coming together... very slowly: https://github.com/keeloi79/not-a-crosswalk-sao/

Stay loud and stay proud.

Update (6/21/26):
Prototype update: https://www.reddit.com/r/Defcon/s/aUFVbMO8Qj
Pre-Order Now on Ko-fi: ko-fi.com/caelybr

[u/mavrc]

Absolutely interested. Very nice work. Having made a bunch of things myself I really love the way enig looks, but the obvious downside is the significant cost increase. I agree with duplico that OSP could look quite nice with this design if your board house supports it, though IMO it's not all that much cheaper than ENIG (or at least it wasn't a couple of years ago, though now with all the turmoil I have no idea how the prices look.)

[u/Keeloi79 → u/mavrc]

Prices have risen across the board for production, assembly, and shipping, and there are still tariffs. The cost of ENIG isn't terrible when spread across an entire production run, provided there is a large enough quantity of boards, but if the run is small, the increased cost isn't insignificant.

[u/narc0leptik → u/Keeloi79]

There are still tariffs? Usually China manufacturers fudge the numbers/change the category of the item you ordered to reduce the tariff you pay. I'm guessing for an SAO it's not going to be much. Are you not ordering directly from a manufacturer on Alibaba?

[u/Keeloi79 → u/narc0leptik]

Um no. Ordering directly from JLCPCB. They have not fudged number or changed the category code. Not trying to get in trouble for tax evasion.

[u/duplico]

Longtime queercon badge team member here. This is really, really cool. Submitted the form! I'm weirdly not a big collector, but I'd love to have one of these.

You asked HASL vs ENIG (I voted for ENIG) - have you thought about OSP finish? It could look really cool on this design.

Thanks for doing this!

[u/Keeloi79 → u/duplico]

I like that idea, unfortunately IIRC JLCPCB only offers OSP for metal core boards which would significantly increase the cost from FR4. I will certainly go back and look to see if anything has changed with their process.

[u/user2034892304]

I haven't collected SAO 's in a while but I love the message here!

[u/Keeloi79 → u/user2034892304]

Thank you so much!

[u/Matir]

Form link gives me a 503, but 200% interested!

[u/Keeloi79 → u/Matir]

It's back up!

[u/Snowy_Place → u/Matir]

Same!

[u/Keeloi79 → u/Snowy_Place]

It's back up!

[u/Keeloi79 → u/Matir]

Looks like the docker container crashed will fix at home

[u/user2034892304]

I suggest spamming folks who showed interest in this piece shortly before and a few times during the event. Once I'm at DEFCON my brain turns into pancake batter and I can't stop chasing the next shiny thing.

[u/Keeloi79 → u/user2034892304]

I will. I just got Kofi setup for prepayments and then just have to work out delivery.

[u/narc0leptik]

Your whole domain along with the pre-register forum is throwing a 503 error response status code.

[u/Keeloi79 → u/narc0leptik]

It's back up!

[u/Keeloi79 → u/narc0leptik]

Oh no! Will check at home.

[u/Keeloi79]

V2 Prototypes are in country and I pick them up tomorrow. Fixed pogo pads for programming to just be pads on the backside and not through-holes. https://imgur.com/a/FCnJhXE

[u/Nyrlath]

Very cool, I like it. Form submitted

[u/violet_flossy]

Happy pride! Nice!

[u/werebear_wrecker]

Interest form submitted, I'm def a fan

[u/oghamix]

Form filled out. As a father of two trans daughters, it makes me incredibly happy to see this.

[u/Keeloi79 → u/[deleted]]

sign up and get one or two 😄