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PIN2DMD EVO HD - upgrade to 256x64 resolution


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3 hours ago, Rene368 said:

Ok. But you also have this jumper in the EVO HD design. I just copied it.

It's in the same way connected as in your design: in off the signal goes through the LS123, in on the signal takes the shorter route overruling the LS123. Please see attatched picture.

Maybe you could clarify this for me.

First design was without LS123 but that made problems. I left it in the EVO schematics for testing to have better access to the input pin of the CPU the LS123 is attached to.

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21 minutes ago, lucky1 said:

First design was without LS123 but that made problems. I left it in the EVO schematics for testing to have better access to the input pin of the CPU the LS123 is attached to.

Ah, for testing.

Then I will leave it out. 

 

If there is more feedback or questions, also from other people, feel free to post.

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  • 1 month later...

Short story: Silicon supply being as it is, ie difficult, I'd like to check on whether the STM32H743VIT6 can be used on a regular PIN2DMD board ?

 

Long story: I wanted to arrange a build of a few 256*64 panels. It looks like the STM32H743VIT6 is more easily available (although none in stock right now in most places) but most importantly price is not completely ludicrous.

 

However to secure supply you need to place an order of a MoQ of about 90 units... More than what I will ever need.

 

Hence the question: is it possible to use the STM32H743VIT6 on a regular PIN2DMD board. That would open the possibilities, I know a few people that would be interested into building batches, so this inventory of 90 parts could go away relatively quickly (although relative is a rather loose term).

 

Regards

 

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Thanks, that clarifies. I was starting to look at the datasheet to check on pinout compatibility, but since you already provided the answer.

 

Given the current pricing of the STM32F4, guess we'll have to wait quite a while to be able to build PIN2DMD again, unless a redesign of the board is done to accomodate easier to source components

 

Regards

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The H7 is not easier to source than a STM32F4. As soon as we switch over to the H7 the chinese manufacturer will also raise the prices for those MPU types. 

IMHO there is no real shortage in the MPUs needed for PIN2DMD it is just an excuse to get higher prices for the components you currently need. 

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I beg to differ

 

Turns out I work in the silicon industry (as in manufacturer of complex ICs). There's shortage almost everywhere, especially complex ICs.

 

Our own components now have a leadtime of between 30 and 40 weeks. I've seen components (FPGAs, FPDLink transceivers, etc) have leadtime ABOVE one year. And I can definitely tell you it's not just an excuse to get higher prices.

 

I can't really say about the STM32 part, for us (meaning my company) however what I noticed is that there has been several "grey distributors" who essentially siphoned the available inventory from regular distributors to then inflate the price. But they would not be able to inflate if there was a decent supply in the first place, which there isn't.

 

I'll check with my direct contacts at STM (as I have some, precisely on the STM32 product line) just to get a feeling of where they are right now

 

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So I had a quick discussion with a few sources:

 

- STM32 is one of the most affected part in the WW silicon shortage (along with FPGAs)

- Leadtime for the ST32H part is ... 46 weeks. ST32F is even more constrained 

- Price increase is the result of broker having siphoned the inventory pre shortage, and indeed playing market demand pricing. If you connect to Farnell/Arrow/RS, who do not price based on market trend but have usually a fixed margin applied to their buying price, so as a result you will notice their price has not increased, but they don't have any inventory

 

If you take a look at Farnell website, they show availability of the STM32F part for... January 2023...

They "seem" to have some availability of the STM32H part for next week, however it's unclear whether this is the result of a running stock and how many parts they will get 

 

RS does not have any inventory nor visibility on availability of STM32F nor STM32H

 

So bottom line, looks like swithing is not an option either, even with a redesign (unless this is changed to a completely different microcontroller), since supply is highly unpredictable.

 

And it's going to last for the foreseeable future (at least one year by the current estimate)

 

Regards

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35 minutes ago, Ashram56 said:

- Price increase is the result of broker having siphoned the inventory pre shortage, and indeed playing market demand pricing.

 

That is what I meant with no real shortage. Depending on your "negotiation skills" the prices for a F4 differ from double to 10 times the old price.

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