first impressions of the Lego smart brick, before I do any actual tearing down: wow, I forgot how good they are at working with plastic.
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also, here's a close-up of the markings on the tiny WLCSP between the BGA and QFN
decided the next thing to do would be to dump the presumed Winbond flash WLCSP
here it is mounted on a SOIC-8 pinout with a tiny bit of UV epoxy, like a particularly exotic dead bug
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@webhat @whitequark @timonsku yeah, the other way to go is to search "ultrasonic cutter", because a "cutter" is not strictly age restricted like a knife. which in this case is particularly funny because ultrasonic knife blades aren't really that sharp, it's barely sharper than a metal spudger.
@gsuberland @webhat @whitequark @timonsku
*thinks* Is the cutting action similar to how doctors remove plaster of paris casts off people's limbs? Blunt instrument that just pushes material out of the way at a very high oscillating speed?
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@whitequark yeah, I'd love to see that being done. What's your plan of how to do it? I think you'd need to un-power or desolder the Bluetooth SoC as this one connects the the CS signals and hence should be the bus master. Or desolder the flash? It's so teeny tiny... I can't do it. You could have it from my second PCB.
@maehw oh i'll just desolder and mount it manually
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@gsuberland @webhat @whitequark @timonsku
*thinks* Is the cutting action similar to how doctors remove plaster of paris casts off people's limbs? Blunt instrument that just pushes material out of the way at a very high oscillating speed?
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@whitequark content of the data matrix code
@claudius Can you point me to the tool(s) you used to get to this decoded view of the DMC? I could use that for a totally different use case I have where I need to reverse-engineer DMCs
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@claudius Can you point me to the tool(s) you used to get to this decoded view of the DMC? I could use that for a totally different use case I have where I need to reverse-engineer DMCs
@Musicaloris this is what "binary eye" QR-Code/Barcode/Datamatrix/... scanner shows you after recognizing a code.
Neat thing: you can throw a static image at it, not just live camera view!
Binary Eye | F-Droid – Freies und quelloffenes Android-App-Repository
Einfach ein weiterer Barcode-Scanner
(f-droid.org)
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@Musicaloris this is what "binary eye" QR-Code/Barcode/Datamatrix/... scanner shows you after recognizing a code.
Neat thing: you can throw a static image at it, not just live camera view!
Binary Eye | F-Droid – Freies und quelloffenes Android-App-Repository
Einfach ein weiterer Barcode-Scanner
(f-droid.org)
@claudius Thanks so much! I even have that app already installed, just never got around to using it apparently
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@whitequark @timonsku really braindead tip: search "ultrasonic kinfe" or "ultrasonic knjfe", because AliExpress censors the word "knife" in listings
@gsuberland @whitequark https://hozodesign.com/products/neoblade is the one I have. Also available on Amazon
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@webhat @whitequark @timonsku yeah, the other way to go is to search "ultrasonic cutter", because a "cutter" is not strictly age restricted like a knife. which in this case is particularly funny because ultrasonic knife blades aren't really that sharp, it's barely sharper than a metal spudger.
@gsuberland @whitequark @timonsku in the end I found a couple of listings, because the listings were in Dutch and they didn't flag the age verification
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first impressions of the Lego smart brick, before I do any actual tearing down: wow, I forgot how good they are at working with plastic. the injecton molding remains impeccable, at least for this specific piece (I know about their recent QC issues elsewhere)
it's hard for me to look at the positively microscopic (I am literally using a microscope to look at it) "Li-Ion" lettering and think of anything but "showing off!"
(treehouse doesn't let me attach the full size images, you can grab them here: front, side)
@whitequark is love to see what of the CAT scans that Tested does on various things.
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I'm not yet sure how I'll open it up. I don't have a hacksaw (somehow... I should fix that), so my options are somewhat limited: it's either cracking or melting plastic. from what others have done I know I there's plastic welding all around the joined region.
@whitequark
No razor saw?
(a super fine modelling saw with a reinforced back) -
@whitequark
No razor saw?
(a super fine modelling saw with a reinforced back)@kirtai me: i don't have a hacksaw
you: no razor saw?
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@kirtai me: i don't have a hacksaw
you: no razor saw?
@whitequark
They're not the same kind of saw
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decided the next thing to do would be to dump the presumed Winbond flash WLCSP
here it is mounted on a SOIC-8 pinout with a tiny bit of UV epoxy, like a particularly exotic dead bug
-
Interesting... I wouldn't do the port myself due to lack of time, but it should be doable.
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@whitequark Wow they've come a long way since the Mindstorms NXT bricks! I wrote my first embedded stuff on that brick, debugging my LCD driver by beeping out register values one bit at a time. Simpler, more innocent times when I didn't have the tools to hook into the handy JTAG port that was right there.
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@Viss bluetooth le, but yes
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decided the next thing to do would be to dump the presumed Winbond flash WLCSP
here it is mounted on a SOIC-8 pinout with a tiny bit of UV epoxy, like a particularly exotic dead bug
connected half of the pads
this is my first time soldering a 0.3mm pitch WLCSP, so it took me a bit to set up the workspace the way that makes it possible, but it's not too bad
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@migratory fascinating!
actually the easiest way to get rid of inconvenient abs is acetone. dump ABS in, get highly flammable toxic sludge out.
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@bob i don't have any nichrome at hand and i'm pretty sure i'd give myself burns if i tried
8-year-old me discovered copper works just fine when attached to a sufficiently large transformer.
much older me is banned from hot tools.
