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Thread: Best way to power a Nexus 7 and USB hub?

  1. #1
    z3n is offline
    Join Date
    Jun 2013

    Question Best way to power a Nexus 7 and USB hub?

    Hey guys, I'm brand new here but am in need of some assistance, so please bear with me!

    I have a 2000 Toyota Celica GT-S and I'm interested in using a Nexus 7 tablet as the head unit. I've taken a lot of inspiration from here:

    What I want to do is just drop my current head unit back into the dash and then modify my current center console to make the Nexus 7 tablet removable, but also good looking (flush, no gaps between trim and bezel, etc). I also want to wire up a powered USB hub so that I can have the ability to add storage and other USB peripherals later on down the road. What I have noticed is that some people on the NASIOC forum have had trouble with power consumption. That's why I'm coming here!

    I've been researching this for a while now and thought I had most of it down pretty good, but now some new ideas have come from the reading I've done today. Here's what I'm thinking...

    I'd like to use a PSU, like a PicoPSU or something along those lines, to supply the needed power for keeping the tablet charged and running a powered USB hub. Probably a bit overkill, but it will allow for expansion later on as well.

    This is the setup I have in mind, after my research this morning and just some basic searching for parts.

    1. PSU: PicoPSU 120W PSU I don't really know what kind of power I'll need, this could be overkill or not, I don't know.

    2. USB Hub: Anker 4 port USB 3.0 + Charging port 12V powered USB hub, should make things a little less complicated, if I have things straight in my mind... more on this later.

    3. Cables: Micro USB Host OTG Cable

    Those are really the only major things I can think of... I'll need some USB extensions, and I might add a DAC later, but this covers the gist of it I think.

    I plan on mounting the PSU in the center console area, closer to the Nexus 7 so that the cable powering that doesn't need to be so long. Then I want to mount the USB hub in the center console/arm rest that sits between the driver and passenger seat in the front, which would have pretty easy access.

    Now of course I have a few questions...

    1. Is this feasible or am I going way overboard?

    2. Will I be able to get the 12V from the PSU, for the USB hub?

    3. Same goes for the 5V, will I be able to get that from the PSU and have it be able to charge the Nexus 7? The Nexus 7 charger specs are 5V/2A.

    4. I'll use the cable I listed to plug the USB hub into, and then can I add a micro USB male end to the wire I use for power from the PSU, if that works?

    Thanks if read this all, more thanks if you answer!
    Last edited by z3n; 06-04-2013 at 03:03 PM.

  2. #2
    Constant Bitrate
    Join Date
    Dec 2005
    Raleigh, NC
    The USB hub takes 12V power? Are you sure? Most of them are 5V.

    You can likely tear apart 5V cell phone chargers to power the tablet/hub for less money.

    You're going to have to replace the stock kernel on the Nexus 7 to use both USB OTG and charge it. See here.
    "You're just about as useless as JPEGs to Helen Keller" - Wierd Al

  3. #3
    z3n is offline
    Join Date
    Jun 2013
    I already have Timur's kernel bookmarked, I've seen reference to it before.

    And this particular hub actually does take 12V, which is weird I know. I chose it because I thought it would be easier to not use any step-down converters and this way I wouldn't. Tearing up a cell phone charge probably would be cheaper, I just want to make sure I can easily handle the power needs if I have an external hard drive or other things hooked up to the hub. I know a few people over from NASIOC had some charging problems with the tablet, and I don't really want to have that issue. I figure for $50 or $60 extra, I can do it better the first time.

    Thanks for taking the time to reply! I have quite a while before I set things in motion. I'm currently saving for project #1: All out deadening using Sound Deadener Showdown.

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