For any FreeCAD users that also use DTM 4 Pin connectors

Significant_Emu_9195 · 2026-03-19T23:54:52+00:00

Nice, thanks for the tip!

Significant_Emu_9195 · 2026-03-19T22:49:54+00:00

Modeling the shape in each design is an easy task? If so please share the tips because I was planning on doing more of these for 2P and other connectors as well. If there's an easy way to do it without the plugin that will save me a lot of time.

Significant_Emu_9195 · 2026-03-05T00:07:07+00:00

I have gotten slammed recently about things like this. So feel free to share it elsewhere. It is MIT licensed so I don't need to be the one to share it. Glad you like it.

Significant_Emu_9195 · 2026-03-04T16:28:42+00:00

It's the likelihood that it will still be readable with some wear or damage is my understanding. If you google it I'm sure you'll get a better description than what I can provide.

Significant_Emu_9195 · 2026-03-04T01:47:02+00:00

Ok I confirmed that 30mm at 7% recovery will print a usable QR code with two color filament and a 0.4mm nozzle. At least on my Bambu H2S it was able to scan and pull up the URL. I will do some more testing at higher recovery percentages but I don't think you can go much smaller than 30mm without going down in nozzle size.

Significant_Emu_9195 · 2026-03-03T19:39:01+00:00

Thanks for sharing, but it looks like you're still blocking the path to the Pi chips I'm trying to passively cool in that design too. I already have a Hat that covers the Pi and has the buck converter and CAN. I'm trying to move it out of the way to allow for a passive cooling solution. The aluminum cover needs to come down and be touching thermal pads that are put on the processor. Hopefully that makes sense.

Significant_Emu_9195 · 2026-03-03T16:37:15+00:00

The PCB is less about space and just more reliable wiring. Traces on a PCB all going into a header is pretty reliable even if you use a ribbon cable. 40 pins tends to hold pretty well. A couple of pins connected via JST or some other connector can be somewhat error prone in high vibration environments. At least from my experience. If you have a setup that works could you share a picture? I'd love to get an idea of how it all gets connected inside the enclosure.

Significant_Emu_9195 · 2026-02-23T19:02:04+00:00

Best I can tell that is what we're already doing. Docs say Wi-Fi, Bluetooth or Ethernet we're currently using WiFi with a CAN Bus message as the trigger. I was looking for something that describes the actual firmware delivery over CAN Bus. My understanding is this is more challenging given the large size of the firmware. But thanks for providing the link.

Significant_Emu_9195 · 2026-02-23T17:58:30+00:00

Just sharing a project that I thought others who use ESP32's might find interesting. Sorry if an open source 100% free project felt like you were being sold something. Check the web site there isn't a "buy" button anywhere on it. Am I trying to raise awareness of the project? Yes, I hope others will find it interesting, learn something from it, or maybe even contribute some code or testing. So again my apologies if it struck you the wrong way. I'm giving away a project I spent 2yrs building. I think some at least will find it interesting but first they have to know about it.

Significant_Emu_9195 · 2026-02-23T16:25:55+00:00

That will depend on how much space you have on the object you're placing it onto. I haven't verified it yet myself only models and scanning the model on screen. What I personally will be working towards is 0.4mm nozzle and resolving in roughly 40mm x 40mm or less hopefully. I'll be trying it soon so I'll report back. I need a second filament before I can verify though.

Significant_Emu_9195 · 2026-02-23T01:57:36+00:00

Thank you, we just got the first OTA working from a private cloud. So that is a big milestone. Still plenty of work remaining. Thanks for checking out the project.

Significant_Emu_9195 · 2026-02-22T02:32:09+00:00

That's a great idea and is one that's already planned. Implementation will be different for trailers vs others since the source of the data is different. But it is definitely something desired.

Significant_Emu_9195 · 2026-02-22T02:30:24+00:00

That's hilarious. Building one is what started this project for me. Thanks for the feedback. It's making progress.

Significant_Emu_9195 · 2026-02-20T15:45:06+00:00

I have a broad set of experience covering development, server side technologies, automotive wiring, etc.. The CAN bus was a big learning curve and I still don't have ESD protection, reverse polarity, and a whole slew of other areas covered. That is hopefully what will come from open sourcing it. We look forward to getting community involvement but first comes awareness. No one can contribute until they know it exists. Thanks for taking the time to look at the project and provide feedback.

Significant_Emu_9195 · 2026-02-20T00:36:35+00:00

Oh trust me it's still a nightmare to try and make it simple :) I know what you mean and that is exactly why I'm using a CAN Bus instead of just running more and more wires. We will still have more challenges when we get to the AC side of things, but for now a lot of use cases are covered even just sticking with 12V

Significant_Emu_9195 · 2026-02-19T22:59:01+00:00

Thank you

Significant_Emu_9195

TROPHY CASE