Any decent 7" Android tablets that don't use USB to charge running 4.1?

BenSkywalker

Diamond Member
Oct 9, 1999
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Dual USB with another port for charging would be even better.

I know, sounds like an extremely odd request so I'll explain.

The tablet it going to be used in a custom car stereo setup. Goal is to make everything entirely modular so upgrading any portion of the chain will be easy. Due to this, planning on using audio over USB and an external DAC which is the reason why I'm looking for 4.1(needed for the external DAC) and a device that doesn't use USB to charge(plan is to have the device appear as a "normal" stereo in use outside of greatly increased flexibility obviously).

Ideally the device would also have a SD slot or 2(well, dual USB would be better as we could use a multi TB HDD) as working around the limits of on board memory can be done, it does make for a cumbersome setup.

The Nexus 7 was the obvious first idea, but it was either sacrifice the audio quality fairly heavily(no tablet's DAC is close to a dedicated unit) and give up any hopes of reasonable storage(music will be entirely FLAC/HD FLAC- 32GB isn't enough) or go with some extremely lame plug swapping for keeping the device charged. Was looking at the Tab 2, but it appears to be lacking dual USB and/or a way to charge it without taking up the data port.

The Nabi2 actually has the hardware, but it is on 4.0 and who knows when we will see 4.1 hit for that device(to be fair, the target of the device would be perfectly happy staying on 4.0 for the life of the device). Another up side to this is it also has a HDMI output which would give us some interesting video options, but the viewing angle on the device isn't up to the Nexus 7 by any means(head on it isn't bad at all, but off angle is a bit 'meh').

Nook devices don't work on multiple layers unfortunately, besides the data/USB combined they also used odd voltages for charging which would present us with a few issues.

Those are the devices I have that I can try on hand, no Galaxy Tab 7"s kicking around unfortunately nor any other offering that may fit the bill. Off angle screen viewing is a reasonable issue, but not one that I am willing to deal with if we can hit all the other factors. Overall performance really isn't that big of an issue as we are going to be using a completely custom UI to make it feel natural and it is very simple to drive, the original Nook Color handles it smoothly.

BTW- I listed Android as they have the only 7" device that I am aware of that supports audio over USB and comes in the 7" form factor which *very* nicely mounts into a standard double DIN slot with relatively little effort.

Any ideas/suggestions would be greatly appreciated.
 

darkewaffle

Diamond Member
Oct 7, 2005
8,152
1
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USB splitter? Though that may only address the physical problem, I don't know if trying to use it for data/power simultaneously would present any sort of logical/bandwidth issue or not.
 

BenSkywalker

Diamond Member
Oct 9, 1999
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I wouldn't think so, as power and data are on different physical lines.

Hmmm, that could have some potential. If I could get a USB hub to work while providing power then I could use external storage and N7 would become the obvious choice. I'll do some poking around and if anyone knows if this setup will work, I don't have what I'd need to make it work here, but I certainly wouldn't be opposed to picking them up if it was a workable solution.

Luckily with this setup the big hole left where the stereo once was leaves a lot of room for packing in such a setup without being unsightly :)
 

BenSkywalker

Diamond Member
Oct 9, 1999
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Nexus 7 can work as a USB hub, but when in host mode it can't charge, so much potential. Still has upside in that knowing that can be done I should be able to work a USB DAC and an external HD together with some other device. Now I just have to figure out which device. May end up trying this out with a Nexus 7 anyway without using the external DAC and get the basics set up and then moving it over to a better quality setup(as far as sound quality goes) once I can find a tablet that has what I need. Hmm, actually, maybe I will end up picking up another Nabi 2 if that's the way I'm going to go, HDMI out would be very handy.

Thanks for the suggestion, I looked into it far enough to figure out what I can and can't do with the N7 at least :)
 

vshah

Lifer
Sep 20, 2003
19,003
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the nexus 7 can charge and output audio via the pogo pins, more information here:
http://forum.xda-developers.com/showthread.php?t=1800099

although they haven't gotten OTG to work at the same time yet. may be worth watching though.

personally i'm using my nexus 7, charging it via pogo pins, and using audio out via pogo pins as well. audio quality is good enough for me.
 

BenSkywalker

Diamond Member
Oct 9, 1999
9,140
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Keeping an eye on that thread, thanks for the heads up. Doesn't look like we are going to have any luck getting host+charge working anytime soon unfortunately(although I will certainly keep my eyes on the situation).

Seems like the only 7" class tablet with a decent DAC built in is the Galaxy Tab 2 for the current generation(or go with a Tegra 2 based tablet which isn't something I want to do either). Going to keep looking.