#neo900 on 2018-04-10 — irc logs at freenode.irclog.whitequark.org

2018-03-03 10:58 Joerg-Neo900 changed the topic of #neo900 to: http://neo900.org | CCCAMP15 lightning talks at http://neo900.org/stuff/cccamp15/ - major: http://neo900.org/stuff/cccamp15/ccc2015talk/neo900-wpwrak_CCC2015.webm | conversations are logged to http://infobot.rikers.org/%23neo900/ and http://irclog.whitequark.org/neo900 | Latest news: http://neo900.org/news/joerg-pia-2018-03-01

00:09 <Oksana> Testing pads? Or what could it be?

00:09 <Joerg-Neo900> testing hardly, it's covered by domesheet in device. Prolly manufacturing QA pattern

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00:10 <Joerg-Neo900> "look there, check exact dimensions, make sure they meet specs" sort of thing

00:11 <Joerg-Neo900> or some layouter been bored ;-P

00:11 <Joerg-Neo900> but then I had expected something more funny

00:12 <Joerg-Neo900> you see more of similar stuff on the framing scrap

00:14 <Joerg-Neo900> http://wstaw.org/m/2018/04/10/plasma-desktopH22448.png

00:16 <houkime> Whe I saw that the first time i thought about precise impedance measurements and stuff.

00:16 <Joerg-Neo900> makes sense, yeah

00:16 <houkime> You generally want such things and on different layers when you want to control material.

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00:18 <Joerg-Neo900> the most mystery part on N900 howver is http://wstaw.org/m/2018/04/10/plasma-desktopI22448.png in http://neo900.org/stuff/Gallery-N900-exploded/n900_02.jpeg

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00:21 <houkime> this pattern was written there with a lot of heat in the writing process. Look at the color changes

00:21 <Oksana> I don't even understand what this dot-art is made of.

00:22 <houkime> it is a laser-written pattern

00:22 <Joerg-Neo900> looks like laser micro QR code

00:22 <Joerg-Neo900> it's a metal blob with this micarcle dots "drilled" into it

00:23 <houkime> control over laser microvias?

00:23 <Oksana> Well, not [micro] QRcode, because not square. But if it's different on each board, then it could be used for identification?

00:23 <Joerg-Neo900> I *bet* on unsoldering it, you destroy it comletely

00:23 <Joerg-Neo900> Oksana: yep, exactly

00:24 <Joerg-Neo900> I think it's a sort of proof of genuine equipment

00:24 <Oksana> Is it functional, or merely identificatory, or both?

00:24 <Joerg-Neo900> it's a metal blob soldered to a single pad, electrically not active

00:25 <Oksana> Okay :shrug: Somewhat boring when an intricate piece of art turns out to not have functionality within it.

00:26 <Joerg-Neo900> hehe

00:27 <Joerg-Neo900> I'd bet the rationale was that any copycats would never do the extra effort to face that

00:27 <Joerg-Neo900> fake*

00:28 <Joerg-Neo900> and who knows, it might have secret in-copy-able properties like depth of the holes different for each, and whatnot

00:29 <Joerg-Neo900> prolly when you know the exact laser wavelength you could read out the depth of holes, like on CD

00:31 <houkime> I bet we can make better than this N900, and OSHW, so nobody will need their stuff anyway.

00:31 <Joerg-Neo900> 17 byte

00:31 <Joerg-Neo900> houkime: hehe :->

00:32 <houkime> gonna sleep. bye. Morning will be connector placing and stuff.

00:37 <Joerg-Neo900> 01010101: 11101111: 00110111: 10110111: 00011011: 01110101: 11110111: 01101101: 11111111: 01101101: 10110011: 00101111: 10100101: 01111101: 10100101: 01010111

00:38 <Joerg-Neo900> dang, missed one byte

00:38 <Joerg-Neo900> from top-left. right-down

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00:42 <Joerg-Neo900> 01010101: 11101111: 00110111: 10110111: 00011011: 10111011: 01110101: 11110111: 01101101: 11111111: 01101101: 10110011: 00101111: 10100101: 01111101: 10100101: 01010111

00:43 <Joerg-Neo900> looks like leftmost bit is sort of 'clock'

00:44 <Joerg-Neo900> so it would be 17 7bit ASCII maybe

00:47 <Joerg-Neo900> there's this too, however http://wstaw.org/m/2018/04/10/plasma-desktopv22448.png

00:48 <Joerg-Neo900> I conveniently retouched that number on my highres scans

00:49 <Joerg-Neo900> http://wstaw.org/m/2018/04/10/plasma-desktopJ22448.png you wouldn't even have noticed, eh? ;-)

00:52 <Oksana> Not without looking for that. Green brush...

00:52 <Joerg-Neo900> :nod:

00:53 <Joerg-Neo900> there's been a white brush too, more obvious

00:53 <Joerg-Neo900> in domesheet

00:54 <Joerg-Neo900> all those numbers wer <<17byte though

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17:13 <houkime> Either bob connector footprint' or sch' pins need reassignment. The way it is now connectors are impossible to mate. Rechecking datasheet (there are two models involved, not sure if their footprint needs to be different or not).

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17:33 <houkime> Checked. Identical Fps are ok except for one model we are not using. But pins on sch need to be reassigned.

17:36 <houkime> calculating pin pairs and reassigning...

17:49 <houkime> Hmmm... library uses only one symbol so I can't just renumber them

17:49 <houkime> I either need to redraw sch or do additional library symbol or an additional footprint

17:53 <houkime> It might be better to make an additional footprint for receptacles with different pin numbering.

17:54 <houkime> ok, doing

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18:10 <houkime> done

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20:33 <houkime> hb.pdf uses wrong sd holder dimensions

20:34 <houkime> 13.5 vs 14.5mm of our real vertical span

20:36 <houkime> right now prioritizig OTG clearance

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22:16 <houkime> hb.pdf does not include the X-axis distance from camera to bob edge thus leaving x of bob projection on LOWER undecided

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