IRC log for #qi-hardware on 20150106

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01:44.49qi-bot[commit] Werner Almesberger: sod.fpd (SOD-123): add SOD-123 (~4.5 x 1.7 mm diode) footprint (master) http://qi-hw.com/p/kicad-libs/34bf59d
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03:21.22xiangfuwpwrak: I received two Y-cables. one of them is works just fine.
03:21.43xiangfuthe other one have a small chip on it....
03:34.41wpwrakgreat ! could you please check how the "nice" cable is connected internally ?
03:35.11wpwraki.e., if it's like http://downloads.qi-hardware.com/people/werner/anelok/tmp/y-cable.pdf
03:35.19wpwrakor if they had some new ideas :)
03:35.40wpwrakchip sounds interesting. what does it do ? ;-)
03:38.04xiangfuwe (me and archang) will upload some pics.
03:38.31xiangfuit is excatly like http://downloads.qi-hardware.com/people/werner/anelok/tmp/y-cable.pdf.
03:38.55xiangfuarchang: can you please check what is that chip for?
03:39.08wpwrakah, you brought reinforcements. nice ! welcome, archang ! :)
03:39.39archangoh. hello
03:40.03wpwrak(exactly) including ID connected to GND on the Micro B (or A) side ?
03:40.04xiangfuthe working calbe is 9.9RMB.
03:40.22xiangfuthe one have chip is 22RMB. :)
03:40.53archangboth are Micro B with the ID connected to GND
03:41.30wpwrak(ID) great, thanks ! it's nice when the industry anticipates my wishes ;-)
03:42.26xiangfuthe picutre on taobao is not same with the one they shipped to me.:)
03:42.34wpwrakin the 9.9 RMB cable, how long are the branches ?
03:42.43xiangfuwpwrak: I will send you two or three of them.
03:42.51xiangfuboth like 15CM.
03:44.15wpwrak(picture) i guess they may just sell whatever they can find. but it's good that lower price means that it's more likely to work
03:44.45xiangfushould we upload to anelok.com/people ?
03:44.58wpwrak(15 cm) hmm, inconvenient if you don't use a laptop. but it's a good start nevertheless.
03:45.03wpwrakyes, please
03:45.21wpwrakand maybe post to the list as well
03:45.35xiangfuwpwrak: ok. I will email the ssh key to you for anelok.com.
03:45.39xiangfuwpwrak: list: yes.
03:46.24wpwrakoh, sorry. didn't pay attention ... no, please upload to qi-hw
03:47.13xiangfuwpwrak: ok. then I will create a wiki page.
03:47.36wpwrakanelok.com is just my private server, trying to look important :)
03:47.57xiangfusure. just asking :)
03:47.59wpwrakor just put it on http://downloads.qi-hardware.com/people/xiangfu/
03:51.55xiangfuuploading...
03:52.33xiangfuwpwrak: here is the taobao page: http://item.taobao.com/item.htm?spm=a1z09.2.9.9.R4rHd4&id=37895461380&_u=69mahte5c59
03:53.13xiangfuwpwrak: there is another one. it is just like hte y-cable: http://item.taobao.com/item.htm?spm=2013.1.w4018-8662707918.8.xvGcUo&scm=1007.168.0.i37895461380&id=36212526756&ad_id=&pvid=6a28154b-3e7b-4eb6-9e37-e0c8904d4637&jlogid=p061152517607e
03:54.37wpwrakah, but that one has 2 x micro. my y-cable.pdf has only one micro. the full-size USB A male goes into PC or laptop
03:55.43wpwrakyes, the ¥ cable looks like what i have in mind
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03:57.17xiangfuYes.
03:57.28xiangfuï¿¥cable. :)
03:57.33wpwrakthough the description seems to suggest that it may not be able to deliver power to the micro B side
03:57.44wpwrakerr, ¥ 12 ;-))
03:58.14xiangfuarchang: have tested on his phone.
03:58.24wpwrakso "¥" means "money" ? i didn't know it was used for RMB, too, only noticed it for Yen.
03:58.59xiangfuÂ¥ both  RMB JPY
04:01.41wpwrakheh, just like "$" is also used for all sorts of "pesos". in some countries, they add letters (which doesn't necessarily help. e.g., in uruguay, they put a "U" for uruguay and an "S" because it's plural. so you get "U$S", which you'll of course read as "US$" (which would be a lot more expensive). very confusing.)
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04:08.30archangCellphone test result on 9.9 RMB cable: OTG works fine, tested on usb keyboard/mouse and usb disk; the power line only supports the otg slave device, no charging to my phone.
04:20.33wpwrakhmm, so it's not quite what we want
04:23.04archangwe need to charge both the slave and host?
04:23.55wpwrakit's nicer for anelok if it doesn't have to use its battery
04:24.26wpwraknot that there would be any charging (i hope :)
04:27.49wpwrakby the way, i'm making good progress with fixing the board errata. almost done with the principal changes. then i'll have to update and check the BOM.
04:30.12wpwrakthe coming version of the board will be almost identical to the prototype i have now, except that it's 1 mm wider (so the FPC of the OLED will suffer less), the rfkill switch is will really be just rfkill (and not system-kill), the crystal should be a bit more reliable (i had a layout bug there), and there will be a better diode on VUSB
04:30.22wpwrak(plus a bunch of minor improvements)
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07:43.38archangwpwrak: an interesting thing about the 9.9 cable: cannot charge my nexus5 but ok on a nexus4...
07:54.15archangand can power up a raspberry pi...
07:54.31archangso it should meet the need
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09:23.00wpwrakarchang: interesting. i think what makes the behaviour of such cables difficult to understand is that there are two mechanisms at play: one is the physical connection of VBUS and the other is the charger detection the software on the phone/tablet/etc. does
09:24.50wpwrakthe device only charges if there is a physical connection and the software decides to use it. so the same cable can work with some devices and not with other. worse, this may change after a sw update.
09:25.04wpwrakand who knows, maybe there's some random element in this, too ;-)
09:26.16wpwrakin the case of anelok it's simple: anelok will just assume the port can do 500 mA and it will tell this to the device. anelok itself needs only very little power, so as long as the port can do 500 mA, it'll be fine.
09:27.42wpwraklooking at the pictures ... oh wow, the second cable is pretty complex !
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21:38.46DocScrutinizer05no chargiing not automatically means the power isn't connected to the micro plug. Actually I can't think of a Y-cable that doesn't connect VBUS to each plug
21:39.41DocScrutinizer05ooh, [2015-01-06 Tue 08:43:38] <archang> wpwrak: an interesting thing
23:14.14wpwrakDocScrutinizer05: it would kinda make sense not to connect power to the "data host" if there's a concern about overloading the "power host". but it's hard to say (without physical examination) whether the cable manufacturers do something like this.
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23:21.53wpwrakthe development of such cables may be an evolutionary process: someone makes a nonstandard cable, sees what happens. then the next one makes a slightly different one, see if that causes less trouble in the field, and so on. once a design seems to work really well (at least with a product that's hot at the time), everyone clones that design. then things change (new device becomes fashionable, new droid version, etc.), etc.
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