KF OTG Discussion

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So I have been playing around with various USB game controllers as well as various storage devices and everything has worked so far (except BT, its detected but thats it). Hashcode has put a low priority on OTG in the kernal dev queue so I would like to get a discussion going about possible hardware solutions to over come the current 3.3v limitation of the USB port when running as a host (which is why devices dont work directly, only through a hub). Someone already suggested a current pump DC-DC in the kernal thread so my current focus something like this: http://www.circuitsathome.com/dc-dc/...c-dc-converter

for some motivation to this end, here is my USB NES controller hooked via OTG:

Controller use brought to you by HaiKaiDo Inc. lol :P

usb otg will work nice if we can up the voltage

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usb otg will work nice if we can up the voltage from 3.7 to 5 volt

southbird already did a proof of concept with a voltage regulator from pololu
http://forum.xda-developers.com/show...7#post25943787

Originally Posted by barrmulio

southbird already did a proof of concept with a voltage regulator from pololu
http://forum.xda-developers.com/show...7#post25943787

Yep saw that. My aim here is to go beyond that and come up with a real design

Sent from my Xperia X10 using xda premium

Can the voltage regulator be wired into the OTG cable? If so I am willing to try this but I need help with the wiring. I am searching now for some type of soapbox enclosure to house the voltage regulator. Any suggestions?

It would serve as the otg cable. The vreg will sit on the power rail between the kf and the normal usb connector. Ultimately, i want to lay out a smd board with the micro usb and regulator that goes in some little enclosure.

Basically what I am thinking of doing is putting the regulator inbetween the micro usb and female usb. It will look like other otg cables but the enclosure with the female usb will be larger.

I am assuming that the red(power) from micro usb is connected to the vout and the red(power) from female usb is connected to vin on the regulator. Do both sides of the ground need to be connected to the regulator or just to each other?

Can this work with GPS receiver?

sent from the greezals fire.

Originally Posted by meturne2

Basically what I am thinking of doing is putting the regulator inbetween the micro usb and female usb. It will look like other otg cables but the enclosure with the female usb will be larger.

I am assuming that the red(power) from micro usb is connected to the vout and the red(power) from female usb is connected to vin on the regulator. Do both sides of the ground need to be connected to the regulator or just to each other?

You could but IMHO, it would be simpler and cheaper to integrate everything as one device. The OTG cable is nothing special, just a micro USB B to regular USB A. The power needs to run from the micro in the KF to the vReg Vin, vReg Vout to the USB A connector, the ground is connected to all three.

Originally Posted by greezal

Can this work with GPS receiver?

sent from the greezals fire.

No clue. I'm sure a google search would yield some answers