Re: List of Android devices supporting power via USB

Sat, 22 Nov 2014 11:04:03 -0800

Thanks for the information. I'll definitely try to find an adapter and try the Xoom. 

Regards,
Mark

From: Ytai Ben-Tsvi
Sent: Saturday, November 22, 2014 9:38 AM
Subject: Re: List of Android devices supporting power via USB

Moto X works for me (in both host and device modes).
Also, note that some Android devices support host mode despite having a micro-B connector as opposed to the standard micro-A. For working with such a device you're have to buy a non-standard OTG adapter (micro-B male to A female). These adapters are pretty common (in either cable or plug form).

On Thu, Nov 20, 2014 at 11:55 AM, Mark Melvin <[email protected]> wrote:
Can anyone confirm this works on the Moto X (2014)?

Thanks,
mark.

On Thu Nov 20 2014 at 2:18:25 PM Mark Melvin <[email protected]> wrote:
Thanks for the info, Bryce!

On Thu Nov 20 2014 at 1:44:14 PM Bryce Johnson <[email protected]> wrote:
I've heard that Nexus 4 doesn't support powering USB host, but you may be able to use a powered USB hub inbetween the two.

My Nexus 5 and 7 - 2012 both support it.

On Wed, Nov 19, 2014 at 9:36 PM, Mark Melvin <[email protected]> wrote:
Thanks. The Xoom does not have a micro A connector, so i guess it doesn't support it. It looks like the Nexus 7 supports it, and I'll try my wife's Nexus 4 and report back. If anyone has confirmed operation on any other Nexus device, particularly the Nexus 5, I'd love to hear about it.

Thanks,
Mark


On 10:30pm, Tue, Nov 18, 2014 Ytai Ben-Tsvi <[email protected]> wrote:
I haven't yet written a wiki page about it.

In short:
  1. Some Android devices support being the USB host, some don't.
  2. When connecting such a device to the IOIO, the USB cable itself determines who will be the host (the "A" side of the cable) and who will be the device (the "B" side).
  3. The OTG adapter provided with your IOIO may be compatible with your Android. If so, having the adapter on the Android side will cause it to become host. Some Android devices don't accept the micro-A connector despite supporting host mode. For those, you'd need to buy a very similar cable to the adapter cable, only with a (non-standard) micro-B connector on the male side.
  4. Regardless of software / firmware / anything else, if you are able to get the red power LED on the IOIO to turn on without external power supply, you're probably good to go and any problems you might have can probably be sorted out with following the right steps in building the Android app. Otherwise, the tablet may not support host mode, or you're doing something wrong with the connection.

On Tue, Nov 18, 2014 at 7:21 AM, Mark Melvin <[email protected]> wrote:
Hi All,

I just found out about this:


And it looks like this is now in the main code base.  But I can't get this to work with my old Motorola Xoom.  I have a couple questions:

1) Is there wiki page documenting how to make this work (do I need a special cable)?  I could not find one.
2) I am assuming not all devices support this.  That's fine, I am willing to buy a Nexus 7 or whatever I need to buy to get this feature.  Is there a list of devices somwhere that do support this?  Would the Nexus 5, for instance?

Thanks in advance,
Mark.

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