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diy mircousb hub

hi folks,
i would to like to build a micro usb hub.
e.g. 1 male connector and 2 female connector.
does anybody have experience in micro usb to stabilize the voltage and current?
thanx

KindsKoPP said:
hi folks,
i would to like to build a micro usb hub.
e.g. 1 male connector and 2 female connector.
does anybody have experience in micro usb to stabilize the voltage and current?
thanx
Click to expand...
Click to collapse
That would be interesting to see, I think your gonna need drivers for that as well because your gonna need a switch to cycle back and forth on what connector your using, and thats gonna be hard to do from scratch. I was contemplating doing something similar to that but wound up at a dead end. If you figure it out let me know.

it won´t need a driver. i want to build as a host hub. but the current is too low i think, so it is difficult to stabilizise the current,,
mbm262 said:
That would be interesting to see, I think your gonna need drivers for that as well because your gonna need a switch to cycle back and forth on what connector your using, and thats gonna be hard to do from scratch. I was contemplating doing something similar to that but wound up at a dead end. If you figure it out let me know.
Click to expand...
Click to collapse

It's not a question of stabilizing the current.
It's supposed to be 5 volts throughout the USB spec.
If you are using a cell phone as the host, that already produces regulated 5 volts through a charge pump.
The amount of current out of a cell phone is maybe around 100 mA.
That's what you have to work with.
If it's not sufficient for what you want then you need an external power source, not a regulator.
Hubs can be power hogs.
The spec says that a hub can take up to 100 mA all by itself.
To make a micro USB you can either take an existing hub and change the connectors.
Of course since the PCB pattern will not match up you'd have to wire the connectors in discreetly.
If you really wanted to make a real job out of this, buy a hub IC for $3,
lay out a PCB, slap on a 24 MHz crystal and connectors.

???
the idea is to build an mobile hub for tablets or smartphones for plugin external devices like sd card reader or usb stick and
mouse and keybord. hub will stick in a phone and plug in the external devices. i already had tried with a keyboard and mouse with standard usb and it works. i had already build some devices with micro usb connector. so i would like to use all devices at the same time and outdoor. i try to solve the idea without a lot of adapter..
if the usb give all devices 5v and 100mA at the same time, that would be great, without an additional IC power supplier..
thats all

i found out thats not possible to use more than 2 gadgets at the same time cause of the voltage without an external power supplier. keyboard and mice work at the same time but i f u want to plug in a 3rd gadget then wont work. 1 solution could be a mobile battery with 5v connecting with the hub. or make a built in battery in the hub..
@ renate. maybe u have an suggestion?

I have a jig for measuring current consumed by USB peripherals: http://forum.xda-developers.com/showpost.php?p=30668417&postcount=26
I use USB with only low power things like a keyboard or else
with a powered hub (also back-powering the Android).
The second option is more like a docking station.

KindsKoPP said:
hi folks,
i would to like to build a micro usb hub.
e.g. 1 male connector and 2 female connector.
does anybody have experience in micro usb to stabilize the voltage and current?
thanx
Click to expand...
Click to collapse
The 2 female connectors don't make much sense i think, because:
I can't think of any device you would like to connect with your phone as host that has a µusb connector..? You would need 2 additional OTG-cables in almost all cases
You would need OTG capability for security reasons: Imagine you hub is pluggend in you phone and you connect you computer to the hub too -> Data crash + 2 power sources in parallel -> risk of damage
I would use a normal tiny usb hub and only change the cable

u did not read my post above attentively or?
quote:
i had already build some devices with micro usb connector. so i would like to use all devices at the same time and outdoor. i try to solve the idea without a lot of adapter..
and the gadget are already automatically OTG. I already thought all about that before!
-schumi- said:
The 2 female connectors don't make much sense i think, because:
I can't think of any device you would like to connect with your phone as host that has a µusb connector..? You would need 2 additional OTG-cables in almost all cases
You would need OTG capability for security reasons: Imagine you hub is pluggend in you phone and you connect you computer to the hub too -> Data crash + 2 power sources in parallel -> risk of damage
I would use a normal tiny usb hub and only change the cable
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Click to collapse

Adding internal full size USB port to Samsung Galaxy 10.1" tablets DIY project

Correct me if I am mistaken but the Keyboard docks for Samsung Galaxy Tab 10.1, Tab 2 10.1 and Note 10.1 all provide keyboard and charging at the same time (and also audio out).
Well, This proves that charging and USB on the go can be made in a single device.
I was thinking in something a little more bold: integrating a full size USB port inside the tablet itself and a microUSB port just for charging with a conventional Android USB cable as the one that comes with my Galaxy S3 (but using the tablet charger, of course, due to the higher Amps).
I plan to make all the modifications inside the tablet and soldering the to the 30 pin port internally.
It sounds crazy but I think it could be done.
My only concern is about USB syncing with the computer. So I guess I should add a switch somewhere to change from USB host (pendrive, keyboard, etc) to USB slave (syncing with computer).
Also, it would be great too if when set in USB slave mode the added microUSB port could serve as syncing port (yeah, I don't like the docking port. It is good for docking, bad for everything else)
My previous tablet was an Acer Iconia Tab A500. It had plenty of interfacing options: a full size host USB, a syncing microUSB, a round two pins charging connector similar to the old nokia ones (allowing charging and using USB pendrive at the same time) and microHDMI out apart from a docking port and audio jack. The only thing I miss from this tablet is its connectivity
Any ideas, comments, suggestions?

Hi, dear friend!
don't you think it will make difficulties with the Tablet's slim design?
I'm interested in this... if you think you can do it, then I may help you do it...
BYE

arashtarafar said:
Hi, dear friend!
don't you think it will make difficulties with the Tablet's slim design?
I'm interested in this... if you think you can do it, then I may help you do it...
BYE
Click to expand...
Click to collapse
Indeed. Nobody said it would be easy, but my Acer Iconia A500 had a full size USB port and it was no thicker than the Galaxy. I think it is a matter of finding the appropriate empty space. Of course, maybe there is not such space to allow the project to become true. I will open the tablet this weekend and then we will see.
In the meanwhile, if anybody has good reference of the 30 pin port, resistance values needed to activate USB OTG and HDMI and if it is possible to have both running at the same time, it would be great.

Have you read this thread:
http://forum.xda-developers.com/showthread.php?t=1155065
In the first post, there are two images of the connections in the 30-pin cable...
I don't remember though... I have read it many months ago...

[Q] Hook up Multiple USB devices

Hi all,
I've just ordered this gorgeous phone and am waiting for it to be delivered. In the meantime I've been wondering given that it's capable of HDMI output and serve as USB host whether it is possible of it doing both at the same time, if say I hooked up the HDMI output along with other usb devices, like a USB drive and a keyboard via a usb HUB. I would be practically creating a bespoke docking station of sorts..
I know it's pushing the technology a little... and there are other alternatives to USB devices (NAS drives, wireless mouse/keyboards...), but my question is more about what the device is capable of.
Thanks.

Update:
So far I've successfully managed to plug in an old USB hub via a cheap micro-usb to USB adapter bought off e-bay. From there I hooked up a USB keyboard, Mouse, pen drive and also USB speakers.
I'm amazed it actually managed to power all of these devices without any problems (imagine battery drain is massive given that the usb hub is unpowered).
I would like to know if anyone has tried hooking up HDMI output while the USB is hosting other devices. Has anyone tried this already? I've searched everywhere and can't seem to find a definitive answer to my question.
As a side note, does anyone know of a docking station for the G2, similar to what you get with laptops?

Did you figure out the answer to this?

AlexOB1 said:
Did you figure out the answer to this?
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Click to collapse
No, I have not yet tried this out. I had bought an HDMI cable/device thing but never got it to work on my TV.. apparently it had something to do with the technology that the phone uses for HDMI not being compatible with older Samsung TVs.
Would be great if anyone else has tried this out could post here, whatever the outcome

[Q] Adapting Samsung Galaxy(s) into simulated laptop

I'm looking for a way to connect my Galaxy (currently the s4) to any monitor I may come across. Easy enough, use an MHL adapter. Here's the fun: I want to connect a keyboard and external memory at the same time, and to keep those from draining the battery I need a way to charge it while doing all this. By the numbers, what I'm looking for is a male MicroUSB that is split into 2 female MicroUSB's and one regular USB, or a single male micro to 2 female micros (could use a Bluetooth keyboard). I'm not sure if those exist or are even possible. Could someone point me toward the right forum for answering these questions? Has anyone tried it themselves? Many thanks, all around.

Hi there,
Please wait until mods will move this thread to the device specific forum for more relevant answers.
Stand by

Can I use "regular" USB-C -> HDMI cable instead of DEXpad? Which one?

Hi guys, is there a way to mirror the phone's screen to other display (let it be a monitor or TV) using USB-C->HDMI cable? Does it matter what cable to buy? Can you recommend one? Are there any caveats to this? Do I need to set the phone somehow or install some app?
Thanks a lot

It will just work from my experience...
I've also bought this thing: https://www.amazon.com/gp/product/B078X9N26D/ref=oh_aui_detailpage_o07_s00?ie=UTF8&psc=1
It works as dex station if connected to power supply and as hdmi if not.
The only bug for this is that it slowly discharges your phone even if it's connected to power...

it works, you don't need a Dex pad anymore.

I believe any usb c to HDMI will work, but I would recommend using a wireless charger with it.
Probably better off just getting the dex station cause either way you go it would be the same amount of money cause I wouldn't recommend going cheap

I know it's ridiculous to ask; but would a NIntendo Switch Dock actually work? Considering it's similar, and the board can be taken to a Very small case, essentially, a mini dock

miksa said:
Hi guys, is there a way to mirror the phone's screen to other display (let it be a monitor or TV) using USB-C->HDMI cable? Does it matter what cable to buy? Can you recommend one? Are there any caveats to this? Do I need to set the phone somehow or install some app?
Thanks a lot
Click to expand...
Click to collapse
In Android Q beta, you can get DEX by using your regular USB cable with the PC