Database Users

please i neeeeeeed help

i try to connect a usb flash memory to my tab 2 and i follow a trick
i get female-to-female usb adapter and connected it to the galaxy tab 2 usb adapter (that comes with it in the box)
then connect to it a usb flash memory , but my tab didn't read any thing
so after searching,using my avometer and making tests between my tab and my lab i concluded that:
-the female-to-female usb adapter is working probably
-there is no 5v output on the usb male adapter so i think because that the terminal device can't be read
please help me, any one can explain that?
is the manufacture close that property or my android is crushed or must be a microcontroller in otg to work,.... or what??

hey ever body , where is the developers
where is the genius people
i need help

My guess is they sell an official USB reader for a reason...
Sent from my SGH-T679 using xda app-developers app

mon3esh said:
i follow a trick
Click to expand...
Click to collapse
Here is the trick I used:
http://www.ebay.com/itm/300701358749#ht_891wt_1037
Open wallet, buy fix
:silly:

The following link shows how to make your own OTG cable (for another device). http://tech2.in.com/how-to/accessor...sb-otg-cable-for-an-android-smartphone/319982. So there is some additional connection b/w pin 4 & 5 that makes it works as OTG cable.
Is it worth the hassle? I am not sure. I got OTG cable for $0.99 in ebay. Before buying it I tried female USB cable like OP and failed.

thanks for every one tries to help
i found the reason
the secret in the 30 pin connector
which its pins are grouped each group is serves another connector in the another side of cable
so the group of usb has a pin named otg responsible for turning your cable to otg cable
so in the usb male connector it is not connected
so i think that is why samsung didn't built in its tabs a micro usb port and built this port instead it "to can market its accessories"

USB - Wiring for ADB?

Hi folks!
I want to connect an android device (it has usb slots... i can plug there 3g dongles, keyboards, wifi etc) with my computer to try to establish an adb session.
Is that possible like that (usb male - male)? Do i have to solder a custom cable - and how would he wiring be to force the android into "client mode"?
Any help is highly appreciated!

licht77 said:
Hi folks!
I want to connect an android device (it has usb slots... i can plug there 3g dongles, keyboards, wifi etc) with my computer to try to establish an adb session.
Is that possible like that (usb male - male)? Do i have to solder a custom cable - and how would he wiring be to force the android into "client mode"?
Any help is highly appreciated!
Click to expand...
Click to collapse
to wiring an usb cable is not so hard. normally you only need to solder the same coloured wire together, red to red, white to white, green to green and black to black. but there are already male to male cable to buy.
www.dx.com/p/ult-unite-ult-1234-usb...lated-data-connection-cable-white-60cm-269067
what does your android device have for an usb? is it micro usb or standard (type a)?
if you have a micro usb port so use an usb data cable, most of the charging cable does have data transfer support.
your computer even needs a driver for your android device to get working the adb.
good luck!
ps. on ytube there a lot vids how to... only search and destroy ( your android)

KindsKoPP said:
to wiring an usb cable is not so hard. normally you only need to solder the same coloured wire together, red to red, white to white, green to green and black to black.
ps. on ytube there a lot vids how to... only search and destroy ( your android)
Click to expand...
Click to collapse
Hi! Thanks for your help! Its a type A jack on that device just like on the computer. Adbd daemon is on the device running but my windows machine cannot detect an usb device with direct soldered pins (or a bought cable which seems to have the same wiring)
I read about possible collitions when both devices of an usb connection are in host mode and that maybe pullup resistors on the data lines are needed - but i didnt fully understand that part. (Its different to the pin shortening of an usb otg wiring which can be found thousand times on google *G*)

can u describe exactly which cable u have used? and sometime the colors of the cable are not correct e.g. red is not +. those are build by chinese manufactures for cheaps goods. so u have even to measure the cable with a voltmeter.
and describe what happen when u plug the cable in the pc. normally windows is always running as main and android as slave.
as you describe u have an usb a type so i guess your android version is minimum 4.x and is already automatically on host status because you said u can put in a 3g dongle...so u have to go to the android command change from inside. i dont know much about linux programming so have to ask a developer. i only do developing hardwares not softwares, sorry for that.
what is your android device? with a datasheet is it better to solve your problem.

Hi KindsKoPP!
Thanks for your help and interest!
Basically I tested with a 1 to 1 wired cable I soldered by cutting 2 usb cables. I double checked colors (measured their output when connected to the computer) and found them ok. Then I connected them 1 to 1 (red-red, black-black, green-green, white-white).
But no usb device showing up or asking for drivers...
I know that adbd is running on the target device.
I pulled up some info here: http://www.valki.com/2014/12/04/analyse-av7/
I am still hoping that those usb devices who are in a double role (like our phones too with their usb otg host mode and client mode for mtp, adb...) are triggerable externally by using special soldered cables (resistors?) ... like "when resistor xy is on D+ -> go to client mode"?

[Q] Is it possible to move the USB port on 2nd Gen?

I just bought a 2nd gen unit to use in my car. I am planning to install it inside using OTG and all that fun stuff. I will also be running my audio out of the USB port (as the audio jack gets that feedback noise from the engine). The issue is the Nexus 7 barely fits in my dash. There is no room to plug a USB cable into the port (even an L shaped one). I know I could do QI charging and clean up the audio from the audio jack, but I need the USB port for the various in car features (turning on quickly and the like).
Looking at teardowns of the 2012 model, it appeared to be easy to move the USB port. In my own stupidity, I didn't know there was a 2012 and 2013 model. It appears the 2013 model is built very differently (h ttps://ww w.ifixit.com/Teardown/Nexus+7+2nd+Generation+Teardown/16072) and I am not sure how I would go about moving the port.
I am willing to leave the back off the unit, or even just drill a hole in it as it will be mounted inside my car permanently. But with how the cables are attached to the PCB that has the USB plug, I can't easily move that PCB (see: h ttps://d3 nevzfk7ii3be.cloudfront.net/igi/T1bQFwmsYTXKYX11). Is my only option to somehow create some kind of extender cable for the USB port, solder that onto the PCB and then put the USB port at the end of that? Am I missing an easier method?
Thanks! (Sorry for the non-clickable links. Stupid anti-spam features won't let me use links yet).

Did you ever figure this out?

Question regarding Android 6 Head Unit and USB Hub

I have what is hopefully a simple and straight forward question. I purchased this unit about 12 months ago https://www.aliexpress.com/snapshot...&orderId=87843158798481&productId=32807153130 and I have both a DVR USB Camera and DAB+ Module connected to the 2 USB ports on the rear of the unit.
It appears that one of the USB ports is faulty, so I can only get reliable DVR or DAB+ but not both. If I were to buy a small, simple USB Hub like this https://www.aliexpress.com/item/keb...-Splitter-Hub-Adapter-For-PC/32889011052.html, connected it to the working USB and then connected the USB Camera and DAB+ Module to the hub, would this work?
Thanks for reading!

I'm not certain if it works correctly on Android 6, but on my unit that has Android 8 i have a similar USB Hub connected that has a memory stick, the TPMS receiver and the receiver for a wireless keyboard, they all work correctly.
Taking into account how cheap a USB Hub is, i think it's worth checking it out.
Also, i managed to get one of the USB connectors into the glove compartment and connect the USB Hub into it, so the devices are easily accessible but not too visible.
Note, if you can take the unit out and send it to a service, they can probably fix the USB connector (the one that doesn't always work), it might have a loose connection, they sometime come loose and can be resoldered to the motherboard.
Also, if you open the unit and check the motherboard, some units have a 3rd internal connector that needs an adapter, not all of them though.

12 pin usb connection

Hi,
I recently purchased a usb cable for my android head unit and the lead doesn't work. I didn't buy the unit so I don't know the brand etc. The unit was in the car when I bought the car.
I'm guessing the wires that plug into the usb connection are in the wrong order. I have no way of finding out the correct order. Does anyone on the forum know the correct order or even show me a picture of their usb cable.
I've bought 2 cables so far, neither of them have worked and they cost close the £100. It's very frustrating that I can't get them to work
Thanks in advance

What does the seller suggest and what happened when you tried that.
Also, with no information and detailed screenshots, how did you want help

When I plug in the usb cable and try any basic usb connections like phone chargers usb sticks etc. Nothing happens at all.
I've attached a screenshot from a product guide I found online if that helps.
If anyone knew which pins were for data transfer or voltage, that could help me loads.
Thanks

Measuring is the magic word. 8 pins will be connected in the original cable. (VBUS)+5V 2 times and 2x GND
...then you only have to find out what is D- and what is D+ for the data lines.
If you don´t want to measure: Open the magic box and have a look at the pins from the connector inside.
Just with your picture no one can tell anything. Each supplier does it´s own magic.
By the way... Connecting that wrong, may damage the internal USB-Hub and you can buy a new mainboard... just to mention. Trying around is not a good idea.