Comment by darksaints | Hacker News Reader

Comment by darksaints | Hacker News Reader

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I've been wanting to do an AskHN for this, but seeing as the Snapdragon855 is directly related to my question, I'm hoping someone here has some insights that could point me in the right direction. I'm currently developing a specialized UAV, and I've gotten to the point where I've got MCU-based FC hardware almost running that is based off of open source Pixhawk designs. But the long term plan is to introduce a variety of tasks that rely on computer vision and/or machine learning, and so the general approach is to go with a companion computer. It seems the default choice for things like this in the prototype stage is a raspberry Pi or Jetson module, but I would really like to develop the entire system as a single module with an eye toward serial production, which means I'm looking at embedding an SOC, as opposed to wiring up an external module. And that has led me to look at the Snapdragon SOCs, in large part due to the GPU capabilities. But now I'm getting into unfamiliar territory, because I can't do ordering/research via digikey like I have done with everything else up until now.

When we're talking about new development, what are the expectations that I should have for direct procurement of higher end components (this goes for Sony/Samsung camera sensors too)? Are there typically very large minimum purchase quantities? Do I have to already have a large production output before I can even talk to them about it? Is it possible to get datasheets even if I'm not at that stage yet?

I get the feeling I'm stuck with the Jetson + Off-the-shelf camera approach until I can demonstrate the ability to mass produce and sell my existing designs, but it would be nice if I could find out more about how that is supposed to play out.

An alternative to Jetson are the SBCs or SOMs based on MediaTek Genio 1200 (MTK MT8395).

The CPU included in this is based on the same Cortex-A78 cores as the latest Jetson Orin, but it should have much better performance per dollar, because the cheaper Jetson variants are intentionally crippled, with many disabled cores and very low maximum clock frequency.

The GPU is weaker than on Jetson Orin, but it should be enough for many applications. There are also a couple of AI accelerators and dual simultaneous video camera capture at high resolution.

In any case, Genio 1200 is much faster than any Pi and also than RK3588. It has a similar performance to a flagship smartphone of 2021.

In the beginning, the SOMs and SBCs with Genio 1200 were expensive, in the $400 to $500 range, so while they were a better deal than Jetsons they still had worse performance per dollar than a SOM or SBC made with an Intel N100 CPU (or its Atom equivalent).

However not long ago Radxa NIO 12L has been announced, which uses Genio 1200 in a SBC of smartphone size at a price of not much over $100, similar to the older and slower RK3588.

Therefore it appears that it has become possible to obtain Genio 1200 at a decent price.

Perhaps if you contact MediaTek sales they might be more willing to provide design information than Qualcomm and they certainly have better prices.

Moreover the Radxa NIO 12L schematics and PCB assembly map are published on their site (a practice that was standard many decades ago, including for the leading US companies, but which now sadly survives mostly in Chinese companies), you can download them and study them to evaluate the effort of designing your custom board and possibly avoid any pitfalls in your design.

This is really amazing information, I appreciate it so much!

I would stick to mounting SoMs on your PCB until you have a clear need for something else, integrating a SoC onto a PCB isn’t trivial, you need to take a lot of care of signal paths and RF properties.

Disclaimer, I'm not an expert in this field.

If you're hoping to commercialize and are a 1-man company, I hope you have a good USP/feature that's beyond "it's cheaper than the competition". If you do have that, I'd say just get an MVP out while keeping systems as platform agnostic as you can. Doesn't matter if you need an extra Jetson, if your product is good enough the extra cost shouldn't really deter customers.

Once you've started, hire/contract folks and streamline it out.

BTW Dev kits do exist for the snapdragon 8 gen 2/3 I think, but they're about $700 last I checked. If you're handy you could even try to reuse a rooted phone, if that's feasible for you.

Take a look at this. It sounds exactly like what you are describing.

https://www.modalai.com/products/voxl-2-mini?variant=4424638...

Maybe this is something you could develop on instead of building your own.

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