#qi-hardware IRC log for Tuesday, 2015-01-06

qi-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/34bf59d01:44
xiangfuwpwrak: I received two Y-cables. one of them is works just fine.03:21
xiangfuthe other one have a small chip on it....03:21
wpwrakgreat ! could you please check how the "nice" cable is connected internally ?03:34
wpwraki.e., if it's like http://downloads.qi-hardware.com/people/werner/anelok/tmp/y-cable.pdf03:35
wpwrakor if they had some new ideas :)03:35
wpwrakchip sounds interesting. what does it do ? ;-)03:35
xiangfuwe (me and archang) will upload some pics.03:38
xiangfuit is excatly like http://downloads.qi-hardware.com/people/werner/anelok/tmp/y-cable.pdf.03:38
xiangfuarchang: can you please check what is that chip for?03:38
wpwrakah, you brought reinforcements. nice ! welcome, archang ! :)03:39
archangoh. hello03:39
wpwrak(exactly) including ID connected to GND on the Micro B (or A) side ?03:40
xiangfuthe working calbe is 9.9RMB.03:40
xiangfuthe one have chip is 22RMB. :)03:40
archangboth are Micro B with the ID connected to GND03:40
wpwrak(ID) great, thanks ! it's nice when the industry anticipates my wishes ;-)03:41
xiangfuthe picutre on taobao is not same with the one they shipped to me.:)03:42
wpwrakin the 9.9 RMB cable, how long are the branches ?03:42
xiangfuwpwrak: I will send you two or three of them.03:42
xiangfuboth like 15CM.03:42
wpwrak(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 work03:44
xiangfushould we upload to anelok.com/people ?03:44
wpwrak(15 cm) hmm, inconvenient if you don't use a laptop. but it's a good start nevertheless.03:44
wpwrakyes, please03:45
wpwrakand maybe post to the list as well03:45
xiangfuwpwrak: ok. I will email the ssh key to you for anelok.com. 03:45
xiangfuwpwrak: list: yes.03:45
wpwrakoh, sorry. didn't pay attention ... no, please upload to qi-hw03:46
xiangfuwpwrak: ok. then I will create a wiki page.03:47
wpwrakanelok.com is just my private server, trying to look important :)03:47
xiangfusure. just asking :)03:47
wpwrakor just put it on http://downloads.qi-hardware.com/people/xiangfu/03:48
xiangfuwpwrak: here is the taobao page: http://item.taobao.com/item.htm?spm=a1z09.2.9.9.R4rHd4&id=37895461380&_u=69mahte5c5903:52
xiangfuwpwrak: 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=p061152517607e03:53
wpwrakah, 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 laptop03:54
wpwrakyes, the ¥ cable looks like what i have in mind03:55
xiangfuYes. 03:57
xiangfuåcable. :)03:57
wpwrakthough the description seems to suggest that it may not be able to deliver power to the micro B side03:57
wpwrakerr, ¥ 12 ;-))03:57
xiangfuarchang: have tested on his phone.03:58
wpwrakso "¥" means "money" ? i didn't know it was used for RMB, too, only noticed it for Yen.03:58
xiangfu¥ both  RMB JPY 03:58
wpwrakheh, 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.)04:01
archangCellphone 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.04:08
wpwrakhmm, so it's not quite what we want04:20
archangwe need to charge both the slave and host?04:23
wpwrakit's nicer for anelok if it doesn't have to use its battery04:23
wpwraknot that there would be any charging (i hope :)04:24
wpwrakby 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.04:27
wpwrakthe 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 VUSB04:30
wpwrak(plus a bunch of minor improvements)04:30
archangwpwrak: an interesting thing about the 9.9 cable: cannot charge my nexus5 but ok on a nexus4...07:43
archangand can power up a raspberry pi...07:54
archangso it should meet the need07:54
wpwrakarchang: 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. does09:23
wpwrakthe 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.09:24
wpwrakand who knows, maybe there's some random element in this, too ;-)09:25
wpwrakin 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.09:26
wpwraklooking at the pictures ... oh wow, the second cable is pretty complex !09:27
DocScrutinizer05no 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 plug21:38
DocScrutinizer05ooh, [2015-01-06 Tue 08:43:38] <archang> wpwrak: an interesting thing21:39
wpwrakDocScrutinizer05: 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.23:14
wpwrakthe 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.23:21
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