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I've noticed when I have my tablet plugged into my computer via USB it doesn't appear to be charging. The battery icon is showing a red lightning bolt. This is different than when I have my tab plugged into a wall socket.
Working as intended or..?
Your PC USB port can't supply enough juice (500ma max) compare to your wall socket (>2000ma) to charge while power the tab. Turn the tab off and your will get some charge off the USB port.
foxbat121 said:
Your PC USB port can't supply enough juice (500ma max) compare to your wall socket (>2000ma) to charge while power the tab. Turn the tab off and your will get some charge off the USB port.
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Click to collapse
Good to know! thanks for your help
just be prepaired to wait a while to gain any % hahaha
Order one of these and then you can charge it from your PC/laptop... or any other USB port for that matter:
USB charger Adapter Cable For Samsung GALAXY Tab p1000
SacTilt said:
Order one of these and then you can charge it from your PC/laptop... or any other USB port for that matter:
USB charger Adapter Cable For Samsung GALAXY Tab p1000
Click to expand...
Click to collapse
That adapter does not convert the power, as stated by foxbat, usb from pc won't deliver enough power.
can use this cable... Y TYPE USB CABLE A MALE to A FEMALE CONNECTOR 2 TO 1. enough power now? y can find it on bay...
ebk71 said:
That adapter does not convert the power, as stated by foxbat, usb from pc won't deliver enough power.
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Click to collapse
It's been charging my tab for about a month now with no problems at all, but I'm not here to argue, if you feel that you know more than I do. I've charged the tablet using that adapter from my laptop, PC, and Energizer XP4001 Power Pack.
You might also search the forums, as I'm not the only one to recommend and use this item.
USB Charger
Have also use this USB charger Adapter Cable For Samsung GALAXY Tab p1000. Works great.
currently having thea similiar,but not same problem; bought this cable of of amazon http://www.amazon.com/gp/product/B005EAEQR4 and while icon indicates its charging, % is not going up at all, mayb 1% per hour or so... am ready to return it, but want to know if anyone else is experiencing similiar problems with a longer cable?
thanks
foxbat121 said:
Your PC USB port can't supply enough juice (500ma max) compare to your wall socket (>2000ma) to charge while power the tab. Turn the tab off and your will get some charge off the USB port.
Click to expand...
Click to collapse
Ahh thanks! Was wondering why it wouldn't charge via my USB port.
(In fact using my Samsung Focus USB adapter for the outlet doesn't seem to work either... I need to use only the Samsung Tab USB adapter)
marcham93 said:
Ahh thanks! Was wondering why it wouldn't charge via my USB port.
(In fact using my Samsung Focus USB adapter for the outlet doesn't seem to work either... I need to use only the Samsung Tab USB adapter)
Click to expand...
Click to collapse
The focus charger is rated only about 700ma (same exact one as Captivate/SGS), marginablly better than PC USB. GT 10.1 has a rather large battery and hence it requires much larger charge current. You don't see any laptop get charged via USB, do you?
jaoropez said:
currently having thea similiar,but not same problem; bought this cable of of amazon http://www.amazon.com/gp/product/B005EAEQR4 and while icon indicates its charging, % is not going up at all, mayb 1% per hour or so... am ready to return it, but want to know if anyone else is experiencing similiar problems with a longer cable?
thanks
Click to expand...
Click to collapse
Is that through the orginal AC adapter or through PC USB?
Turning off the tablet and charging it via USB works, but it takes forever!
SacTilt said:
It's been charging my tab for about a month now with no problems at all, but I'm not here to argue, if you feel that you know more than I do. I've charged the tablet using that adapter from my laptop, PC, and Energizer XP4001 Power Pack.
You might also search the forums, as I'm not the only one to recommend and use this item.
Click to expand...
Click to collapse
And you are not the only one who is waiting twice as long before his tab is fully charged. Then we can open a topic "Why does it take so long before my tab is charged?" As foxbat stated: You don't see any laptop get charged via USB, do you?
So if I say your adapter doesn't work its just as accurate as your answer it does work.
ebk71 said:
And you are not the only one who is waiting twice as long before his tab is fully charged. Then we can open a topic "Why does it take so long before my tab is charged?" As foxbat stated: You don't see any laptop get charged via USB, do you?
So if I say your adapter doesn't work its just as accurate as your answer it does work.
Click to expand...
Click to collapse
Hey, I'm not here to argue with you. I'm just an idiot.
Go about your business, and don't listen. I'm ok with that.
First of all, not all USB ports are equal.
On many modern PCs, the USB ports can deliver more than 500mA over USB if required. This is definitely true for pretty much all Macs since 2007, and quite a few mainboards from other manufacturers (see this article for some background).
Secondly, I've had one of these adaptors for quite a while now, and have used it regularly to charge my Galaxy Tab 7" which uses exactly the same power supply and cables as the GT 10.1. I can categorically state that when using this adaptor, it the GT7 does charge from a Macbook Air and a 5000mAh external battery that has a 1A output USB port labelled for an iPad.
Whilst it might not be as quick as the wall charger, it is definitely much faster than attempting to charge the GT7 from the same devices without the adaptor, even if the device is in use.
I've not formally tried to charge my GT10.1 with it yet, but I did check to see if the "not-charging" indicator went away (which it did), so I rather presume it will work much like the GT7.
Regards,
Dave
SacTilt said:
Hey, I'm not here to argue with you. I'm just an idiot.
Go about your business, and don't listen. I'm ok with that.
Click to expand...
Click to collapse
You don't need to embarrass yourself by saying you're an idiot, It's very childish and the second time you mention I'm supposed to be smarter then you. I'm sorry you take this so personally.
i just use the supplied cable and it charges via usb on my computer. it shows not charging, but it basically trickle charges when the tab is both on and off
After a certain person (on XDA) forcing me to prove that charging VIA USB is possible, I suppose I should share with all of you guys as well. I have a MZ601, so it's an original XOOM (you don't say right? hahaha), a few weeks ago I brought a car charger that has multi-tip, so it means you can swap out the adapter and such. I tested it on my XOOM and it worked, so I came to the conclusion that the XOOM official charger was 5V but in reality when I was chatting to solarnz about it, he mentions it was a 12V and to my surprise it was. Anyways the point is if you can convert or buy an adapter pin to usb for the XOOM it is possible to use any source of USB power to charge the XOOM.
Here are some pictures so you get the idea:
https://www.dropbox.com/s/l4rn5le1dvqvnjy/2012-09-25 10.02.46.jpg
https://www.dropbox.com/s/qmf9wunfvj4zets/2012-09-25 10.04.08.jpg
https://www.dropbox.com/s/ma4j1xsw9j9q79s/2012-09-25 10.03.05.jpg
https://www.dropbox.com/s/pkevl5cvkb5kk1e/2012-09-25 10.18.53.jpg
https://www.dropbox.com/s/6lqlaxoef1xcu6l/2012-09-25 10.19.09.jpg
So there, I hope you guys can find it useful and not flame me like that certain someone.
Edit:
I should also add, charging via USB is pointless and slow only for if you really need to. Unless you got an adapter that outputs 1.0A + it probably be faster than standard usb, but what's the point if you got your original charger?
Always good to have options.
brandogg said:
Always good to have options.
Click to expand...
Click to collapse
cool slow but if u need some power it should help
very interesting post, i have a car charger but not multi pin...didnt know that it can charge through pc usb
Thats really good to hear, as the pin is fragile and i hate it. I have an old samsung tablet usb charger and to my surprise it did work.
Where can I find these adapters?
I've always been sure that plugging the xoom to a usb 5v 1A+ charger would have worked but couldnt find a bloody adapter that fits that unique pin
You can not charge xoom by usb.
Usb is not connected to the xoom battery.
Stop the question
That's not exactly charging via USB.... that's using a power tip adaptor to charge FROM a USB power source.
This is not exactly news.
Sent from a galaxy far^2 away.
feffe73 said:
You can not charge xoom by usb.
Usb is not connected to the xoom battery.
Stop the question
Click to expand...
Click to collapse
Eun-Hjzjined said:
That's not exactly charging via USB.... that's using a power tip adaptor to charge FROM a USB power source.
This is not exactly news.
Click to expand...
Click to collapse
Rats, got me all excited, even tried a couple of my usb chargers (didn't work of course).
Should change the thread title to: Charging VIA USB is ** NOT ** POSSIBLE (MZ601)
The charger tip is not that unique actually it's the same size as the NOKIA N71 mobile
Sent from my MZ601 using Forum Runner
Thanks for this info. Now I know we are certainly able to charge our xoom via USB. Eventhough it's very slow, but always good to have this option.
Re: [ROM][4.2.2] My Android 4.2 for Xoom Wi-Fi (20130217)
Edit. Wrong thread
Could anyone link me to where these tips are sold? Did some searches on the usual marketplaces and didn't find anything.
feffe73 said:
You can not charge xoom by usb.
Usb is not connected to the xoom battery.
Stop the question
Click to expand...
Click to collapse
I no longer have my Xoom, but if I remember correctly, the Motorola dock for it charges via USB... the standard plug goes into the dock, but where the Xoom sits, there is only HDMI male and USB male connectors.
FWIW: My mother now has my old Xoom and she accidentally bent the pin inside the Xoom where the normal charger goes. The only thing that will work now is the dock to charge it until the port can be fixed.
WorldOfJohnboy said:
I no longer have my Xoom, but if I remember correctly, the Motorola dock for it charges via USB... the standard plug goes into the dock, but where the Xoom sits, there is only HDMI male and USB male connectors.
FWIW: My mother now has my old Xoom and she accidentally bent the pin inside the Xoom where the normal charger goes. The only thing that will work now is the dock to charge it until the port can be fixed.
Click to expand...
Click to collapse
My Xoom model MZ604 'OEM HD Dock' connects via the pogo pins, usb and hdmi. I always assumed the power was supplied via the pogo pins.
xdatastic said:
My Xoom model MZ604 'OEM HD Dock' connects via the pogo pins, usb and hdmi. I always assumed the power was supplied via the pogo pins.
Click to expand...
Click to collapse
That's correct. Just checked what you call the "pogo pins" on my OEM dock and they are at 12VDC. Contrary to the title of OP, I don't think it's possible to charge via USB.
b4b4.4l1 said:
Thanks for this info. Now I know we are certainly able to charge our xoom via USB. Eventhough it's very slow, but always good to have this option.
Click to expand...
Click to collapse
No you can't, USB is 5v and the Xoom requires 12v to charge.
Sent from my ADR6400L using Tapatalk 2
atloops said:
That's correct. Just checked what you call the "pogo pins" on my OEM dock and they are at 12VDC. Contrary to the title of OP, I don't think it's possible to charge via USB.
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Click to collapse
I believe the USB portion was simply to help with alignment for tthe pins
USB is for audio out
impossible
how could you charge a 7.4 Volt battery with a 5 Volt charger?...
that sound impossible to me
Regards
I'm wondering if anyone knows if it's possible to have simultaneous OTG & charging with the use of a pogo pin charger?
For instance, plug in a usb OTG into the main microUSB charging port, and use a pogo pin charger [either make one or buy when they are available], and have a flash drive, or hard drive plugged in, and charge at the same time with the pogo pin connector?
I used to have a Nexus 7, and via a custom kernel, and a OTG charging cable [basically a regular OTG with additional power wires & connector for charger]. But I think it would be simpler to use the pogo pin approach. The only thing I'm worried of however, the kernel might disable OTG while it charges via pogo, or perhaps disable charging while OTG is enabled. I guess in this case, we would need a modified kernel to achieve simultaneous OTG and charging.
Here is a link to one of the first Nexus 10 pogo charger cables and it makes this claim:
"You still can power Nexus 10 while the USB port is otherwise occupied for data uses. It is fun & convenient to have MagNector to free up the USB port and charge faster."
http://www.ebay.com/itm/MagNector-N...ader_Chargers_Sync_Cables&hash=item20ce4990a6
So if that statement is true than the answer to your question is Yes.
eBay item is no longer available..
However, I know how sellers often make unfounded claims like that. So while it's probably a good sign, I am not convinced it's true. If anyone is fortunate enough to have a pogo charger, could you test it out with a otg cable and let us know the results?
Or if you're a kernel hacker, maybe take a look at the kernel source code and tell me what you think?
Also if anyone has a link where I could read about pogo pins for the N10, I'd like to read it. I'm interested in trying to make one, if they don't make any low-cost ones in the near future.
:bump:
mvmacd said:
eBay item is no longer available..
However, I know how sellers often make unfounded claims like that. So while it's probably a good sign, I am not convinced it's true. If anyone is fortunate enough to have a pogo charger, could you test it out with a otg cable and let us know the results?
Or if you're a kernel hacker, maybe take a look at the kernel source code and tell me what you think?
Also if anyone has a link where I could read about pogo pins for the N10, I'd like to read it. I'm interested in trying to make one, if they don't make any low-cost ones in the near future.
Click to expand...
Click to collapse
The answer to the question is ye, you can charge and use otg. Btw, http://pogocable.com/ 20$ isn't a bad price...
lKBZl said:
The answer to the question is ye, you can charge and use otg. Btw, http://pogocable.com/ 20$ isn't a bad price...
Click to expand...
Click to collapse
Just wondering, have you actually tried it yet? I remember on the n7 it would disable pogo charging when you plugged in otg. I hope n10 is different.
Swiped from my Nexus 10 using xda-developers app
I got the pogo cable in today. I plugged the usb-otg cable into the Nexus 10 with a thumbdrive connected to it. Stickmount recognized the thumbdrive and I can read/write to it. I noticed that the battery runs down while the otg is plugged in though. Running Paranoidandroid 2.99 with whatever kernel comes with that.
bd177 said:
I got the pogo cable in today. I plugged the usb-otg cable into the Nexus 10 with a thumbdrive connected to it. Stickmount recognized the thumbdrive and I can read/write to it. I noticed that the battery runs down while the otg is plugged in though. Running Paranoidandroid 2.99 with whatever kernel comes with that.
Click to expand...
Click to collapse
Does it say "Charging (USB)" or "Charging (AC)" in Settings > Battery?
mvmacd said:
Does it say "Charging (USB)" or "Charging (AC)" in Settings > Battery?
Click to expand...
Click to collapse
It says "Charging (AC)"
I know it's not the original question, but it looks like that would be possible with a modified OTG USB cable. Sounds like you already have something similar.
I was thinking about this for using my n10 for larger video recording when away from wifi. Just need to hook a battery up to the OTG while its plugged into the thumb drive. It takes a charge off my laptop when connected via the otg usb, so it should work as well with the correct setup voltage/wiring .
I would also like to know the pin designation for the pogo plug. If you can do the same setup as the one above, with the pogo... There would be less chance of damage to the tablet on the go......
metaled222 said:
I know it's not the original question, but it looks like that would be possible with a modified OTG USB cable. Sounds like you already have something similar.
I was thinking about this for using my n10 for larger video recording when away from wifi. Just need to hook a battery up to the OTG while its plugged into the thumb drive. It takes a charge off my laptop when connected via the otg usb, so it should work as well with the correct setup voltage/wiring .
I would also like to know the pin designation for the pogo plug. If you can do the same setup as the one above, with the pogo... There would be less chance of damage to the tablet on the go......
Click to expand...
Click to collapse
I know a nonstandard OTG cable [a OTG charging cable, basically the same as a regular one, except it has female USB only connected to the charging pins] and a modded kernel allowed for simultaneous OTG + charge on the Nexus 7, but I'd rather not have to deal with that, as getting a separate pogo charger seems like a better option.
mvmacd said:
I know a nonstandard OTG cable [a OTG charging cable, basically the same as a regular one, except it has female USB only connected to the charging pins] and a modded kernel allowed for simultaneous OTG + charge on the Nexus 7, but I'd rather not have to deal with that, as getting a separate pogo charger seems like a better option.
Click to expand...
Click to collapse
It has to be a moded kernel to access the data in read/write mode? Nothing to do with charging, and correct?
What I was considering is a battery/usb hub combo. One that plugs into the micro usb port and the battery actually has a female usb port for the thumb drive (need root to write to the drive, but not to stream from it). Amazon carries lots of external batteries with micro usb connection and the female usb port.
I agree, the pogo would be much simpler and still allow data through the micro usb.
The pogo would be much better for portability for this type of use especially if it allows for faster charging. If no one has the pin layout, guess I'll wait to get mine and test them myself. 6 pins on the n10 itself so it's not a standard usb pin setup?
metaled222 said:
It has to be a moded kernel to access the data in read/write mode? Nothing to do with charging, and correct?
What I was considering is a battery/usb hub combo. One that plugs into the micro usb port and the battery actually has a female usb port for the thumb drive (need root to write to the drive, but not to stream from it). Amazon carries lots of external batteries with micro usb connection and the female usb port.
I agree, the pogo would be much simpler and still allow data through the micro usb.
The pogo would be much better for portability for this type of use especially if it allows for faster charging. If no one has the pin layout, guess I'll wait to get mine and test them myself. 6 pins on the n10 itself so it's not a standard usb pin setup?
Click to expand...
Click to collapse
No, on the Nexus 7, if you plug in a OTG cable [which basically grounds a certain pin, the only difference between micro OTG and micro to full size USB adapter], it disables charging through power pins, because it needs to send power to OTG device, for example, a flash drive. It needs +5V power.
So the kernel mod was to disable the output of power, so that it could instead receive power and charge, from the charger. [The charger also 100% powering the OTG device]
Even if you have an externally powered hard drive, it needs power to turn on, even if it uses a wall adapter for the actual power to run the device.
Here is the kernel I was talking about: http://mehrvarz.github.com/usb-host-mode-power-management-nexus7/
it was made by a rootzwiki user. some discussion here: http://forum.xda-developers.com/showthread.php?t=1934722
Check the images of the USB hub on the 1st link.
Just for the heck of it I plugged a USB cable connected to my PC into the Nexus 10 while the pogo was also connected. The Nexus 10 showed up on the PC as it normally does in the file explorer and I can transfer files back and forth as usual. I went to Settings -> Battery on the Nexus 10 and it showed "Charging AC". I then unplugged the pogo cable and the status changed to "Charging USB". Plugged the pogo back in and the status switched back to "Charging AC". Then to make sure the pogo was actually doing the charging, I watched 2 hours of Netflix with the screen set to full brightness. The battery went down only 2%, so I'm pretty sure the pogo was doing the charging.
Sv: [Q] Pogo pins and OTG question [simultaneous charge & OTG?]
Thanks for your test. However with Nexus 10 connected to pc it is not in otg/host mode. You need to connect for example an usb memory with a otg cable to test if charging work with host mode enabled. There seems to be some discussions going on claiming pogo charging is disabled in host mode on Nexus 10 as well. It would be really really stupid if that's the case and I can't for the world figure out how they could put this limitation in the kernel.
Skickat från min HTC Desire via Tapatalk 2
Johan1976 said:
Thanks for your test. However with Nexus 10 connected to pc it is not in otg/host mode. You need to connect for example an usb memory with a otg cable to test if charging work with host mode enabled. There seems to be some discussions going on claiming pogo charging is disabled in host mode on Nexus 10 as well. It would be really really stupid if that's the case and I can't for the world figure out how they could put this limitation in the kernel.
Skickat från min HTC Desire via Tapatalk 2
Click to expand...
Click to collapse
Yes I tried that and the pogo would not charge.
EDIT: I bought a couple of OTG Y-cables on ebay (1 male micro usb end, 1 female micro usb end and a female usb end) to play around with when I saw they had a fix for the Nexus 7. I tried one on my Nexus 7 (PA rom and Timur kernel), connecting the female usb to a powered usb hub that has 16gb sdhc card plugged into it. Then connected the female micro usb end to a spare micro usb charging cable and the other end of the charging cable to the usb hub. The male micro usb end gets connected to the Nexus 7. I fired up the Nexus 7 while in the Asus pogo dock I bought for it and it charges the Nexus 7 while also allowing the OTG connection. I tried the same setup with my Nexus 10 (PA Rom, Ktoonez kernel) and pogo cable and it worked. The Nexus 10 charges through the pogo cable while the OTG works also. With the usb hub I'm using with the Nexus 10, I had to plug the charging cable into a charger wall wart. I don't think the old hub was putting out enough power to power the usb device. I let them both run over a day like this. Ran some RomToolBox app backups on both them and they both are charging on the pogo pins while doing so. If you go to system settings -> battery it shows "Charging AC" on both.
The galaxy nexus already has a custom kernel that supports OTG + charging (via a y-cable):
http://forum.xda-developers.com/showthread.php?t=1835720
In that thread (and the link in the OP there) there are discussions about porting that kernel to the nexus 7. Also, this modified kernel is (currently) for 4.1.2. Unfortunately I am not smart enough to do this myself (especially we are now dealing with the pogo cable and the USB); I do hope to let everyone -- especially the developers! -- knows about the possibility in view of the gnex kernel.
Is this an issue only with Disk Media over OTG, or is it with anything (controllers, etc.) over OTG?
If anyone is interested read my edit a couple of posts up.
Sv: [Q] Pogo pins and OTG question [simultaneous charge & OTG?]
It says AC charging even though it's not actually charging. Confirm this with for example battery monitor widget.
Skickat från min HTC Desire via Tapatalk 2
Hello i just received my pogo cord, and had it charging when i wanted to transfer music, plugged micro usb into pc and it my screen woke up, just curious if this might help or not or maybe it doesnt do anything??
thanks
bodom_hc said:
Hello i just received my pogo cord, and had it charging when i wanted to transfer music, plugged micro usb into pc and it my screen woke up, just curious if this might help or not or maybe it doesnt do anything??
thanks
Click to expand...
Click to collapse
If your connect both your pogo cable and your mico usb cable to your pc they won't charge at the same time. Drivers at the kernel level detect that both are connected to the tablet and only let one charge to prevent power draw overload. In this case it would charge from the pogo charger as it can recognize that the pogo charger is delivering a safe amount of power while simultaneously cutting down on charging time. You can however connect your pogo charger and have the tablet charge while the micro usb cable is connected to transfer files to and from your tablet, use adb etc. Let me know if you still have questions.
shimp208 said:
If your connect both your pogo cable and your mico usb cable to your pc they won't charge at the same time. Drivers at the kernel level detect that both are connected to the tablet and only let one charge to prevent power draw overload. In this case it would charge from the pogo charger as it can recognize that the pogo charger is delivering a safe amount of power while simultaneously cutting down on charging time. You can however connect your pogo charger and have the tablet charge while the micro usb cable is connected to transfer files to and from your tablet, use adb etc. Let me know if you still have questions.
Click to expand...
Click to collapse
I would double check that comment. I have a pogo plug and OTG cable with Ethernet adapter or SD card reader attached. The icon that indicates the device is charging shows BUT it is not actually charging. I confirmed this under both Android 4.3.x and 4.2.2
3DSammy said:
I would double check that comment. I have a pogo plug and OTG cable with Ethernet adapter or SD card reader attached. The icon that indicates the device is charging shows BUT it is not actually charging. I confirmed this under both Android 4.3.x and 4.2.2
Click to expand...
Click to collapse
Very interesting, the point I mentioned above is as least theoretically what is supposed to happen when plugging on both charging sources. Just to clarify your device doesn't charge at all when you have the pgoo plug and OTG cable with Ethernet adapter or SD card reader attached?
shimp208 said:
Very interesting, the point I mentioned above is as least theoretically what is supposed to happen when plugging on both charging sources. Just to clarify your device doesn't charge at all when you have the pgoo plug and OTG cable with Ethernet adapter or SD card reader attached?
Click to expand...
Click to collapse
In theory yes but Google didn't include it in the Android rom. A developer for the old Nexus 7 did add the capability but never for the Nexus 10. I doubt very much that the next version of the Nexus 10 will include a pogo plug connection.
I installed it in my dash and removing it is a pita it was working perfectly fine but for some reason it wasnt showings charge or turning off or on with the car it just stays on i tried restart nothing happens i tried unplugging usb from powergen and plugging back in no result
Also if i go to usb rom under fixed installation i am able to check box and uncheck also did nothing
I am using nexus 7, timurs usb rom, otg cable, original charging cable and powergen usb charger
Please help thanks
Anyone???
I'm also using Timur's kernel with USB ROM for my car installation. I know that it can be very picky on the order the USB plugs are added (data and power). It may seem simple but remove the the OTG cable from the tablet and remove both the data and power legs from the OTG as well. The follow the order listed by Timur on his website:
To activate charging, you must first connect your external power supply to your OTG Y-adapter - then plug the OTG adapter into your Nexus 7 - and then connect any slave devices.
Click to expand...
Click to collapse
Hopefully that should get you back up and working. I completely understand how frustrating it is to have everything plugged in and see that tablet isn't charging, especially when its difficult to get to the Nexus itself.
does anyone have a easy charging solution these car chargers dont work
and a good otg y cable
You could try using a power inverter which will give you a standard US plug from the cigarette lighter. From here, you could plug in a regular outlet adapter. I found this to work pretty well with my own set up and managed to get one pretty cheap at Walmart. As for a good OTG y cable, your best bet is probably to go on Amazon and find one with a lot of good reviews. They can vary in quality and some of the cheap ones I've gotten from China have flaked out after a short time and little use.
Sent from my Nexus 7 using xda app-developers app
Not seeing usb power
I had the same issue. I was using a 90 degree adapter into an OTG cable and my n7 wouldn't go into fixed install mode. Turns out my adapter cable was stopping the n7 from recognizing power. I removed the 90 degree adapter and plugged straight to otg and it worked as advertised. The issue was found during my bench testing on a 12v powersupply. I still have to find a 90 degree otg cable that will work.
So... try a different cable or if you have an adapter between the otg y cable, that may be the issue.