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-   -   N800 USB OTG Adapters/Dongles (https://talk.maemo.org/showthread.php?t=15705)

iliaden 2008-04-16 22:44
Re: N800 USB OTG Adapters/Dongles
 
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!

mrlanrat 2008-04-16 23:35
Re: N800 USB OTG Adapters/Dongles
 
This works Just fine.

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

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

iliaden 2008-04-16 23:54
Re: N800 USB OTG Adapters/Dongles
 
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.

Benson 2008-04-17 00:15
Re: N800 USB OTG Adapters/Dongles
 
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.

mrlanrat 2008-04-17 00:15
Re: N800 USB OTG Adapters/Dongles
 
Quote:
Originally Posted by iliaden (Post 170837)
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)

mrlanrat 2008-04-17 00:18
Re: N800 USB OTG Adapters/Dongles
 
Quote:
Originally Posted by Benson (Post 170843)
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.

microfab 2008-04-17 02:35
Re: N800 USB OTG Adapters/Dongles
 
Doesn't ANYBODY make a AA battery powered USB hub???

mrlanrat 2008-04-17 02:41
Re: N800 USB OTG Adapters/Dongles
 
Quote:
Originally Posted by microfab (Post 170879)
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.

microfab 2008-04-17 02:52
Re: N800 USB OTG Adapters/Dongles
 
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).

mrlanrat 2008-04-17 03:04
Re: N800 USB OTG Adapters/Dongles
 
Im sure there is one out there somewhere...
I just do not know where and I'm the kind of guy who builds everything myself. ;)


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