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[USBHOST] DIY USB Host dongle

OP pokey9000

1st July 2011, 06:58 AM   |  #1  
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Problem, Samsung?





Recipe:
1 dock connector from Kineteka
2 10k ohm resistors - needs to be 20k, a single 22k is too much
1 donor USB extender cable
Various heat shrink, tape, etc to taste

Pinout here. With the connector plugged into the Tab, and the Tab oriented with the chat camera on top and the connector on bottom, pin 1 is to the left of the connector.

Chop off the plug end of the extender, separate out the wires, cut / strip / tin. Cut off the shield. Slide on the plastic shroud for the dock plug and a piece of heat shrink for strain relief. Don't forget this or you'll have to undo the whole thing (like I did). You might also want to cut thin heat shrink to go around each wire to protect it from shorting at the connector pins.

Solder the two resistors in series and put them between pins 13 and 15. This tells the Tab to go into OTG host mode. Be creative. Surface mount parts might be better here.

Solder:

ground (black) to pin 1
green (D+) to pin 3
white (D-) to pin 4
red (+5V) to pin 6

Test this out before shrinking the pins by plugging into the Tab along with a USB key. If it works, you should get the message above.

Once it works, put the connector shield, spring clip, and shroud on.

All said and done, this comes out to about half the price of the Samsung adapter, but at the expense of some elbow grease and potential unreliability. I expect clones will be showing up on eBay someday though, so if I've done anything useful here it's to entice our friends in China to start their assembly lines.
Last edited by pokey9000; 1st July 2011 at 08:23 AM.
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1st July 2011, 07:04 AM   |  #2  
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Clean it up and start selling them imo.
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1st July 2011, 07:39 AM   |  #3  
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Quote:
Originally Posted by mbh87

Clean it up and start selling them imo.

Better?



Taken before I have to ugly it up with a bit of hot glue. The connector housing is too shallow to fit the resistors and make a good strain relief with heat shrink. I also noticed that the retainer ring that holds the housing together pops right off when you unplug the connector. A little super glue needs to go there too.
Last edited by pokey9000; 1st July 2011 at 08:21 AM.
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1st July 2011, 08:25 AM   |  #4  
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Nice job dude specially since they are taking forever to release the damn thing
1st July 2011, 08:43 AM   |  #5  
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Lol. This is awesome goodjob. Might have to try this out
1st July 2011, 12:21 PM   |  #6  
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Well played

I'll give this a shot
1st July 2011, 12:56 PM   |  #7  
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i'm hoping that the connector can allow you to utilise many of the pins at once.. i'm thinking of designing an all in one connector that has USB host/OTG connectivity and allows me to charge the device and still allows me to use HDMI/component video out
1st July 2011, 02:28 PM   |  #8  
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Quote:
Originally Posted by time_shock

i'm hoping that the connector can allow you to utilise many of the pins at once.. i'm thinking of designing an all in one connector that has USB host/OTG connectivity and allows me to charge the device and still allows me to use HDMI/component video out

I will pay you infinity for that, give you my firstborn, whatever you want. But seriously, what use is a "media dock" if you can't charge while I are passing hdmi thru.

Back on topic, nice job OP, that is my new weekend project
1st July 2011, 02:46 PM   |  #9  
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Nice job.

Since I don't have a galaxy tab 10.1 . I have an idea :



Is it possible to use female female usb adapter for the GT ?

does any GT10.1 owner verify whether or not this method is working?
1st July 2011, 03:16 PM   |  #10  
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Quote:
Originally Posted by nemir

Nice job.

Since I don't have a galaxy tab 10.1 . I have an idea :



Is it possible to use female female usb adapter for the GT ?

does any GT10.1 owner verify whether or not this method is working?

Nope, won't work. With this you won't get the 5V power from the tablet, and you won't have the resistor on the ID pin to tell it to go into OTG mode. I suppose you could provide your own 5V power to the device, and hack the kernel to force it into OTG. But that's probably as much trouble as building a cable anyway.

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