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Manual USB OTG working

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By CaptainMuon, Junior Member on 16th February 2013, 05:45 PM
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22nd February 2013, 06:27 AM |#81  
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I just found out that it won't be possible to use SlimPort and USB devices at the same time.
Video and USB are switch at the connector.
 
 
22nd February 2013, 06:32 AM |#82  
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Quote:

mouses generally have a lower consumption than Keyboards, for obvious reasons.

What obvious reasons? Personal experience with three different sets of wireless mice+keyboard combos suggest different to me.
But if a step up transformer would do, then maybe a cell wouldn't be needed, right? A college kid could build one from components from his labs.
22nd February 2013, 06:56 AM |#83  
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Re: Manual USB OTG working
Do we know if it outputs any kind of voltage right now? I would be willing to try the step us with some flash memory over the next few weeks but don't know what kinds of changes we would need to make in the kernel.

Sent from my Nexus 4 using Tapatalk 2
22nd February 2013, 07:25 AM |#84  
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Quote:
Originally Posted by Murukesh

What obvious reasons? Personal experience with three different sets of wireless mice+keyboard combos suggest different to me.
But if a step up transformer would do, then maybe a cell wouldn't be needed, right? A college kid could build one from components from his labs.

USB mouses consumption is lower than keyboards due the size of the circuits, usually keyboards uses a larger micro-controller, some of them with macro capability and other stuff even have external memory

Based on my actual and previews USB Keyboard and Mouse set, usually the keyboard consumes near to 500mA and the mouse near 120mA

for the step-up question, yes, if the phone spits out something trough the USB_VCC, a cell will not be needed. its cheap to built a step-up circuit, if the guy have a protoboard the sky is the limit! but i don't think he can do one as tiny like pololu does

the size of the circuit itself is ridiculous:



and its cheap, i ordered 2 to play a lil bit with it and see what i can do, but since i don't live in the US i don't know how long till it arrives.

Quote:
Originally Posted by SSMI

Do we know if it outputs any kind of voltage right now? I would be willing to try the step us with some flash memory over the next few weeks but don't know what kinds of changes we would need to make in the kernel.

Sent from my Nexus 4 using Tapatalk 2

For what i was reading in this topic, some one said that the phone output on the USB_VCC is the same output of the battery, 3.7~3.8V

But that step-up booster works in a range starting from 0.8V to the max output (5V)
Last edited by memebr; 22nd February 2013 at 07:33 AM.
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22nd February 2013, 07:42 AM |#85  
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Quote:
Originally Posted by elzafir

Yes. This! A battery powered USB OTG cable!

To OP, are you planning to develop a kernel and maintain it or just the develop the OTG functions?

For the auto-enabling OTG support, maybe make an app to manually enable it? Or we could persuade Stickmount's developers to incorporate an "enable OTG" button.

I like the idea. Might be a little niche for a hardware company to develop it though. It might not be as elegant as a OTG cable with a battery imbedded, but I'm sure you could just connect an external battery via micro USB to the Y cable and thus you have something portable without the need for a power outlet. Please correct me if I am wrong on this, I've never tested it myself.
Last edited by MrWulf; 22nd February 2013 at 07:47 AM. Reason: removed irrelevant component
22nd February 2013, 09:10 AM |#86  
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Just for demonstration:
https://docs.google.com/file/d/0B9iC...it?usp=sharing

But for me is it kind of useless without SlimPort.
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Last edited by Noc2; 22nd February 2013 at 10:11 AM.
22nd February 2013, 12:00 PM |#87  
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Keeping the faith
22nd February 2013, 05:33 PM |#88  
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Re: Manual USB OTG working
Realized this when connecting my N4 to a ps3 to copy my awesome r32 pic I took GT5, but nope...

NEXUS 4=Richard mille watch
22nd February 2013, 05:37 PM |#89  
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Quote:
Originally Posted by androidfoshizzle

Realized this when connecting my N4 to a ps3 to copy my awesome r32 pic I took GT5, but nope...

NEXUS 4=Richard mille watch

Sorry, but the meaning of this post eludes me!
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22nd February 2013, 09:36 PM |#90  
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Re: Manual USB OTG working
Damned expensive watches. A quick Google shows one worth $77000, and yes, I didn't forget the decimal point.

Sent from my Nexusthulhu II via the xda-developers app.
24th February 2013, 01:19 AM |#91  
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I'm having a problem setting this up, and I wonder if anyone has some advice.

I successfully set this up (see post #11) with a USB OTG cable and a powered hub. But I wanted to set it up exactly as CaptainMuon suggested, i.e. with the Y-cable. It just came today, and it's not working. As CaptainMuon said in a later post, there are lots of cables out there, good and bad, so who knows if mine is good.

Here is the cable listing on ebay, not that anyone will be able to tell if it's good or not!
http://www.ebay.com/itm/USB-2-0-A-Fe...item3cc23945d3

I connected everything just as CaptainMuon suggested:
- Y cable power plug (typically red) to the PC or adapter
- Other Y cable plug into the OTG cable
- OTG cable into the phone
- USB device into the Y cable socket

I am connecting to my laptop to get power. The only questionable part was which part of the Y-cable had power...my Y-cable did not have a red plug (male USB A). So I'm using the "skinnier" one, and it must be the right one. I say that because if I try hooking the other male USB plug to my laptop, I am able to see the phone as my E: drive. That tells me that is the data cable.

When I issue "lsusb" before the "echo host" command, there are 2 entries. IThe "echo host" command always adds a 3rd entry. On my successful try (with the USB powered hub instead of the Y-cable), 2 more entries show for the actual device(USB microsd adapter) that I inserted into the hub. But in this unsuccessful try, only the 3 entries show for "lsusb", and the device will not work. I try to mount it with stickmount, but there is no point in that....the fact that no new entries show for the device means the stickmount will not work.

So...I guess this means I have a bad Y-cable. Does someone have a suggestion for a simple way to prove the Y-cable does or doesn't supply power? I mean, something that doesn't involve the phone at all. I hope that isn't too vague!

EDIT: Well, a thumbdrive is working fine with the Y-cable. This is the opposite of what occurred with the USB powered hub. I could get the microsd adapter with a microsd card to work fine. But I could not get a thumbdrive to work. So I'm confused, yet I'm very happy to see that my Y-cable is working fine. So I apologize for the long post!

EDIT2: About a month later, I got another Y-cable. It works well. The Y-cable mentioned above obviously had some capability, but it must have been flawed. The new one allows charging to occur also.
Last edited by sga999; 23rd March 2013 at 10:30 PM.

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