USB OTG Cable host mode while charging anyone try this accessory?

tahlsr · Aug 17, 2012

I've searched and never seen an actual 'buyable' product linked on the forums so if this is a dup, I apologize.
Anyone try one of these and see if you can have your Nexus in host mode and charge at the same time?
Is the only option for the female Micro USB port to bring more charge to a usb device plugged in and not to bring charge
to the Nexus itself?

Two scenarios would make this ideal for me:
1.) using my usb xbox controller to play games yet still keeping my tablet charged
2.) using a usb thumb drive to play a movie while still keeping my table charged

I think this would be pretty cool if it worked but I don't know the technical details on if it can be done with our Nexus 7's:
http://www.ebay.com/itm/110931117836

$T2eC16F,!)QE9s3HCoObBQH0,FVoY!~~60_12.JPG

kenyee · Aug 18, 2012

Looks like it's meant for providing power to the USB device you connect (e.g.. external hard drive) instead of to the Nexus7...

dcplaya · Aug 21, 2012

The eBay description says it provides charging the the micro-USB port. Only way to know is to buy it and try it out

vzwty · Aug 21, 2012

Who's going to be the Guinea pig?

Sent from my Nexus 7

RED ZMAN · Aug 21, 2012

Hell, I'd do it, but I don't have a Nexus seven yet. LOL

I've been waiting for someone to get a working solution fit this before I purchase one. That and I need good 3.5mm sound quality and I've read its ****e on the Nexus 7.

Blasted from my HTC Rezound (Zone23s Newtified 3.2.1)

AraDreamer · Aug 21, 2012

RED ZMAN said:
Hell, I'd do it, but I don't have a Nexus seven yet. LOL

I've been waiting for someone to get a working solution fit this before I purchase one. That and I need good 3.5mm sound quality and I've read its ****e on the Nexus 7.

Blasted from my HTC Rezound (Zone23s Newtified 3.2.1)

My sounds works fine, and I haven't even bothered getting the volume + app yet for tweaking. I think there's just no pleasing some ppl with a bare bones tablet like this one.

-Ara

Sent from my Nexus 7 using xda app-developers app

RED ZMAN · Aug 22, 2012

I have a OK Galaxy Tab in the dash of my car, and use the headset port for music, didn't want to upgrade without seeing one in person.

Hopefully some sort of dock solution will make Otg and charging possible and I can upgrade. Thanks!

Sent from my Transformer TF101 using Tapatalk 2

WinDroidGuy · Aug 22, 2012

Ordered 1, but says shipping is between September 7 to September 20

haha

CasualStarlord · Aug 22, 2012

OTG and Charging is mutually exclusive, the OTG cable triggers the USB controller to send power out to a device, not receive power.

the pogo docks on the bottom of the device are also impossible to charge from as the nexus 7 has only been given one charging circuit, and that is the same one that OTG disables.

The only way to achieve something like this would be a physical battery hack where you splice in a charging circuit direct to the battery, without frying the phone maybe some unidirectional resistors, so that it can be simultaneously charged whilst powering the device.

I'm 99% certain of this information, and this is not to say someone might hack a kernel together one day

barkerd25017 · Aug 22, 2012

you might be able to install one of them batteries you can just set it on a charging pad and it will charge

WinDroidGuy · Aug 22, 2012

barkerd25017 said:
you might be able to install one of them batteries you can just set it on a charging pad and it will charge

davidcampbell said:
OTG and Charging is mutually exclusive, the OTG cable triggers the USB controller to send power out to a device, not receive power.

the pogo docks on the bottom of the device are also impossible to charge from as the nexus 7 has only been given one charging circuit, and that is the same one that OTG disables.

The only way to achieve something like this would be a physical battery hack where you splice in a charging circuit direct to the battery, without frying the phone maybe some unidirectional resistors, so that it can be simultaneously charged whilst powering the device.

I'm 99% certain of this information, and this is not to say someone might hack a kernel together one day

I have a ZAGG battery pack I'm planning on trying this with and I will report back

I also have that same pad and I can get a fairly cheap charger to place on the matt as you say. Either way that wouldn't be very convenient, but I'll check it out

Sent from my Galaxy Nexus

Entropy512 · Aug 22, 2012

davidcampbell said:
OTG and Charging is mutually exclusive, the OTG cable triggers the USB controller to send power out to a device, not receive power.

Wrong. https://github.com/teamhacksung/and...mmit/4c1c965b168bc4488ef66889e1c8933bc1b3de46 for an example on Galaxy S2/Note

As to whether the adapter linked is a proper OTG ACA (they're VERY hard to find) and whether the grouper supports OTG ACA is unknown. It's something a kernel developer can probably implement.

CasualStarlord · Aug 24, 2012

Thanks Entropy512, I can see it working on other devices, that gives me hope... I might rig something up myself now, I've wanted to take a cheap usb keyboard plastic leather cover, and build in an extra battery, card reader and usb hub, now this might be theoretically possible

memphian · Aug 24, 2012

http://xdaforums.com/showthread.php?t=1822653

I don't have a N7 yet, but when I get one I want to try that.

Sent from my SGH-I777 using xda app-developers app

ED2O9 · Aug 24, 2012

I can confirm that simply splicing a standard OTG cable into the port and plugging in a power cord will not work. I thought I'd utilize the empty socket from where the rear camera was supposed to go, and try to fit the OTG-to-microSD set-up inside of the Nexus. I bought a salvaged USB/headphone port from a damaged Nexus off of Ebay for $1 and the smallest microSD adapter I could find. With the use of a ribbon cable from an old laptop, some trimming, and some REALLY careful soldering I was able to make it work... sorta. Stickmount sees the card and everything runs great, until you plug in a power cord. Then, it disables the microSD adapter, and even though Stickmount says it's there, no files are visible. Also, the Nexus won't charge with this arrangement.
It might work with a different set up, but simply mimicking the OTG cable will not allow a Stickmounted volume and when the charger is plugged in.
(BTW - To make everything fit, I had to use a Dremel to grind away some of the mid-frame area around the rear camera space. It's a tight fit, but keep in mind that until you have a spare mid-frame, like I do, you'll obviously void your warranty.)

Mechanio · Aug 25, 2012

ED2O9 said:
I can confirm that simply splicing a standard OTG cable into the port and plugging in a power cord will not work. I thought I'd utilize the empty socket from where the rear camera was supposed to go, and try to fit the OTG-to-microSD set-up inside of the Nexus.
...
Stickmount sees the card and everything runs great, until you plug in a power cord.

I tried this very thing, same results.

veeman · Aug 25, 2012

Has anybody tried charging through the pin connectors on the left side?

nst6563 · Sep 1, 2012

Mechanio said:
I tried this very thing, same results.

Same here, only I went a step further and added a 36k resistor from the ID line to ground and that didn't do anything either.

Cetin · Sep 2, 2012

Hope all your work ends in success.
I would like to put this device as a car Entertainment system later. But charging and USB otg is a must.

NEXUS 7

l0rdraiden · Sep 2, 2012

It's a nice method to use in a couple of years your old Nexus 7 as a seedbox

USB OTG Cable host mode while charging anyone try this accessory?

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