N800 USB OTG Adapters/Dongles - Page 25 - maemo.org

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	iliaden	2008-04-16 , 22:44
	Posts: 267 \| Thanked: 50 times \| Joined on Feb 2008 @ Montreal, Canada	#241

don't!!!
it might seem as a good idea, but the n800 will not give out enough power. what I did was get a battery powered USB hub. I cannot even plug in a simple card reader in the dongle alone! (a usb drive works perfectly though).

search for a power hub first.

http://www.electronicproductonline.c...oducts_id=1802

it even has a NIT certification!

Last edited by iliaden; 2008-04-16 at 23:03.

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	mrlanrat	2008-04-16 , 23:35
	Posts: 292 \| Thanked: 46 times \| Joined on Oct 2007	#242

This works Just fine.

Here is a picture of my N810 with this hub powering 2 USB flashfrives!

http://picasaweb.google.com/mrlanrat...31120812517442

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	iliaden	2008-04-16 , 23:54
	Posts: 267 \| Thanked: 50 times \| Joined on Feb 2008 @ Montreal, Canada	#243

nice... but the flash drives are what requires the LEAST power. if it could work without a power cable for 2 sd card adapters, you'd make my day!

btw, i wouldn't recommend hacking into the device and increasing the max. output on the USB - might be critical on the device.

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	Benson	2008-04-17 , 00:15
	Posts: 4,930 \| Thanked: 2,272 times \| Joined on Oct 2007	#244

There are hacked kernels about that disable the check; but that doesn't permit increasing the actual power consumed; it is useful, however, when using some (poorly designed) hubs that have a power jack, but claim themselves to be bus-powered. Or, with a bus-powered hub modified to be battery powered. But the N800 will still shut the USB power down in case of an overcurrent, it just won't stop first from software, so it's not dangerous.

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	mrlanrat	2008-04-17 , 00:15
	Posts: 292 \| Thanked: 46 times \| Joined on Oct 2007	#245

Originally Posted by iliaden

nice... but the flash drives are what requires the LEAST power. if it could work without a power cable for 2 sd card adapters, you'd make my day!

Like this?
http://picasaweb.google.com/mrlanrat...00515853166994
My N810 powering a USB hub, a USB Flash drive, and a multi-card reader reading a 2GB SD card. (I only have one card reader to test)

Last edited by mrlanrat; 2008-04-17 at 00:29.

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	mrlanrat	2008-04-17 , 00:18
	Posts: 292 \| Thanked: 46 times \| Joined on Oct 2007	#246

Originally Posted by Benson

There are hacked kernels about that disable the check; but that doesn't permit increasing the actual power consumed; it is useful, however, when using some (poorly designed) hubs that have a power jack, but claim themselves to be bus-powered. Or, with a bus-powered hub modified to be battery powered. But the N800 will still shut the USB power down in case of an overcurrent, it just won't stop first from software, so it's not dangerous.

I noticed this when taking the above photo. I tried it with 2 USB drives and the card reader, My N810 automatically shut off USB. I had to unplug everything and plug it back in to make it work.

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microfab	2008-04-17 , 02:35
Posts: 77 \| Thanked: 10 times \| Joined on Nov 2007	#247

Doesn't ANYBODY make a AA battery powered USB hub???

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	mrlanrat	2008-04-17 , 02:41
	Posts: 292 \| Thanked: 46 times \| Joined on Oct 2007	#248

Originally Posted by microfab

Doesn't ANYBODY make a AA battery powered USB hub???

It can be done with a 9v easily, I'm not sure about AA's. Use a 7805 voltage regulator to give 5v power to the hub. If you want to use AA's you will need about 6 of them, or just the one 9v.

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microfab	2008-04-17 , 02:52
Posts: 77 \| Thanked: 10 times \| Joined on Nov 2007	#249

Obviously a 9V is the way to go, I just wasn't wanting to build one myself. I can't believe someone hasn't build a battery powered hub. (Rechargeable is overkill).