The mini-A connects to the Tobi. The mini-B goes to the hub.

 

Actually I checked my cable from Digikey, and the two ends are shaped differently.

The mini-A end is marked with an ‘A’ so you can’t go wrong J

 

That should do it for you.

 

Also there appears to be two web sites on the go: http://Gumstix.org which I believe is the original site.

And http://wiki.gumstix.org/ which appears to be the newer one. Hence the confusion with my messages …

 

Later;

 

Bill

 

"People sleep peaceably in their beds at night only because rough men

stand ready to do violence on their behalf." - George Orwell

 

From: Curtis Olson [mailto:curtolson@gmail.com]
Sent: Thursday, July 21, 2011 3:41 PM
To: General mailing list for gumstix users.
Subject: Re: [Gumstix-users] Capabilities of USB OTG port

 

Hi Bill,

 

Thanks for clarifying.  That confirms some of what I was observing by trial and error, and answers a few more questions.

 

One more question ... for the mini-A to mini-B adapter (required by the OTG port), which end plugs into the Tobi OTG port?  The two plugs (mini-A vs. mini-B) do not appear to be plug-in compatible and my Mini-B plugin fits the Tobi side.  


Or is the Belkin hub you mentioned designed to plug into a mini-A style connector?

Just hoping to maximize the chances that I order the right stuff the first time. :-)


Thanks,


Curt.

 

 

On Thu, Jul 21, 2011 at 2:16 PM, William Pretty Security Inc <bill.pretty@xplornet.com> wrote:

Ok;

First of all, here is the link to the wiki I was talking about: http://gumstix.org/getting-started.html

 

As for the USB hubs, it may not be obvious from the documentation, but they do come with their own 5V power supply (about 2 Amps!)

 

The type of cable I mentioned with the Digikey part number, is also available from Gumstix. Delivery is just faster from Digikey.

However a straight mini-B to mini-B cable WILL NOT WORK. I ordered several before I figured out what was wrong L

You need a “Mini-A to Mini-B” cable. They look the same, which sucks, but one of the pins on the connector is grounded.

 

This web site has a good explanation of the various cable types: http://www.accesscomms.com.au/Reference/USB.htm

 

Depending on how handy with a soldering iron you are J I spliced the power connector for the Tobi and the connector for the hub

together and connected them both to the same 5V 2 Amp power cube. Works like a charm …

 

good luck;

 

Bill

 

"People sleep peaceably in their beds at night only because rough men

stand ready to do violence on their behalf." - George Orwell

 

From: Curtis Olson [mailto:curtolson@gmail.com]
Sent: Thursday, July 21, 2011 1:10 PM


To: General mailing list for gumstix users.
Subject: Re: [Gumstix-users] Capabilities of USB OTG port

 

On Thu, Jul 21, 2011 at 11:28 AM, Curtis Olson <curtolson@gmail.com> wrote:

 

USB Hubs that work for me:        Belkin    F5U700-blk         – 7 port hub

                                                                Belkin    F5U403-blk         - 4 port hub

 

The 7 port hub had trouble powering high power devices (Alpha WiFi adapter).

 

Hi Bill, I appreciate your responses, but when I look up these devices I don't see any evidence that they are externally powered.  Have you been able to use the USB-*OTG* port on the Tobi without an externally powered HUB?

 

Hi Bill, ok, I do see that in one of the later pictures on the newegg site, there's a port for power and a power supply with the 4-port hub you listed.  So as best as I can tell,


The both USB-HOST and USB-OTG ports seem to require a hub to get them to do anything (at least with the devices I've tested.)  And in addition, the USB-OTG port doesn't provide 5v power so to use the USB-OTG port requires not just a hub, but an externally powered hub.

 

Does this jive with other folks understanding?

 

Thanks,


Curt.

--

 


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Curtis Olson:

http://www.atiak.com - http://aem.umn.edu/~uav/

http://www.flightgear.org - http://gallinazo.flightgear.org