Custom Shield - MicroSD/FRAM

Just a heads up!

I have emailed the PCB files to @will for the 1st manufacturing run targeted at :spark: Team + Elites for final testing and feedback.

Once we clear that stage, crowdfunding comes in :smile:

If you’re are already interested, :heart: and reply with your name below :wink:

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There are several layers already that are dedicated to component reference designator names (tNames, bNames) and values (tValues, bValues). I typically don't display the values on the finished board. Then you can typically use the tPlace and bPlace layers for extra free text such as your board number, company info, extra polarity info, and pin labeling. Label everything you can!


You know I'm interested @kennethlimcp :smile:

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@BDub,

Thanks for reply.

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Noob question: For the FRAM, did you go with the SPI bus over the I2C bus because SPI is faster?

@Hypnopompia, it depends on your application but yes, the SPI is much faster than I2C (18Mhz vs 100KHz). One application I have in mind is for creating a large display page buffer in FRAM because the Spark RAM is so limited. So to get a decent screen refresh rate, SPI is the only way to go. :smile:

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Hey guys–just an update.

Have been emailing back and forth with @kennethlimcp on this one, so I should be able to bang them out (PCBs + assembly) once I get to China for our next production run. I’ll be deplaning in Shenzhen in a week or so.

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@will,

I see a great potential for these MicroSD/FRAM shields.

Thanks for working with @kennethlimcp !!! You guys are awesome…

Bobby

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I have a piece of bad news and hopefully it gets resolved soon enough.


A call from element14 reveals that the microSD socket i’m getting is out-of-stock worldwide and the leadtime is 9-11 weeks.

They kindly found me a replacement which looks exactly the same from far and i was tempted to hit the replace-and-buy button.

Sadly, the pads and contacts are slightly varying and that’s not going to work.

I’m going to work with Will to see if i can get it sourced in Shenzhen, at least for the 1st beta run.

Sorry for the delay guys :slight_smile:

I managed to secure all components and the 1st run should be shipped by end of June latest :slight_smile:

Pre-order website will be posted once I have done it up.

Thanks everybody!

Updates

All parts are here except for MicroSD socket, in time for Run #01. The pcbs are ready too!

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MicroSD socket came in time for my flight to Shenzhen tomorrow!!

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Well as we say in the Midwest… “get dumb!”

As in, done thinkin’ about it… time to get it done!

First one out of the oven.

FRAM works great but yet to test the microSD.

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This is awesome! cant wait to get my grubby little fingers on 1 or 2 of these!

Will you be supplying them in header-less form? i would like to solder the spark directly to your board to save height

I have my project up and running with an SD card already, so i could do some testing for you…

And something to keep in mind when you do testing… i found a bug in the SD library… well it found me… i corrupted a card by opening it for read/write and then reading it… it broke the card :frowning: so formatted it with SDformatter and got it working on a PC no probs… but couldnt for the life of me get it going on the core (all different random errors), tried factory resets and all. So… being in the middle of nowhere with no shops for well over 100miles (and only accessible by helicopter) i decided to use my phone SD card. it worked no probs, first go so i knew the wiring was still good. i decided to try the dead one and it worked again flawlessly??? — So if you corrupt a card and cant get it to go again, try a different card and then swap back :slight_smile:

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Thanks for the input :slight_smile: yeah I guess I can leave the headers unpopulated and it makes shipping a flat thing easier you know!

Drop me a PM and see if i can ship you one.

All baked and left with the Arduino style shield headers and test code :smile:

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Are these going to be stackable headers so we can still breadboard with the Core?

For sure! That’s on my mind from Day 0. :wink:

Also, i just wanted to let you guys know that the shield is fully functional :wink:

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@kennethlimcp, that is one sweet looking shield. You should be very proud dude :smiley:

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I’m more proud of the one you will be having with 2 x FRAMS on. BUT FOR SURE THIS SO EXCITING HERE!!!

Finally my baby is done and making them ALL BY HAND give me tremendous sense of satisfaction :wink:

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@kennethlimcp, you gotta start somewhere! BTW, I have ideas on how to optimize your FRAM driver :smile:

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That’s so awesome! Nice job! :smiley: :thumbsup:

Woo!