Nexus 7 2012 WiFi Tablet: Issues with OTG Y Cable and 4 USB Hub using Timur's Kernel ROM

Question

Hello, I recently bought a Nexus 7 WiFi tablet (2012), I downloaded the Timur's Kernel rom because the tablet is used instead of the radio in the car, I bought an Otg Y cable and a regular Hub with 4 usb inputs, the problem is how the power supply to the otg cable and the hub is connected to...

gradek83 · Answer

Your USB HUB to a separate power socket?
This is more or less the schematic of the OTG Y cable

The outgoing cable is for charging, i.e. you connect it to the USB power socket in the 5V lighter from 0.5A to 2A. The USB hub, if it does not have a separate power supply, receives power from the phone and thus from the cigarette lighter power supply, if connected.

Take the best picture as you put it together.

malaoko · Answer

I even disassembled this hub, I unsoldered the cable from the +/- I soldered the power supply from the Dc-Dc converter and left only the cables from the Data + / Data - and then nothing, the tablet shows the 400mb / s hub in the USB device (or I do not remember something exactly) but if I get hooked devices, do not connect them.

And I have a question, I found such a diagram on the net and if I create it, I will add more usb inputs as in the 2nd photo, will it be ok?

gradek83 · Answer

And without a HUB, as for OTG directly, each device you hook up can see? Do you have an ordinary OTG cable? Did you check on such a cable? This USB HUB, what you have is USB3 or USB2.0

malaoko · Answer

This is how every device sees, I just care about supporting it: -pendrive -dac usb - reversing camera -tuner dvbt

gradek83 · Answer

Probably the USB HUB is to blame, for example, on an ordinary OTG, I connected the USB HUB and the CAMERA and PENDRIVE to it, and this and it works. Of course, under the samsung galaxy s4. I have a UH473 on the GL850G chip

malaoko · Answer

Above I threw a cable diagram, you can look. I bought one and it had a processor inside, when I measured it with a cable continuity meter, if I put it on the DATA + input, there was no continuity on DATA + behind the processor on the usb inputs. It seems to me that this processor just goes crazy. You can upload a link or photo to your hub.

gradek83 · Answer

This cable is quite long for you, maybe the losses are too high.

malaoko · Answer

There may be losses on data transmission? because I gave a short power cable to what I soldered to +/-.

gradek83 · Answer

Not data, but power loss. Check if you connect the HUB to a PC or Laptop, whether it works normally and whether, for example, after connecting a USB cable and, for example, a Phone to it, will it detect the phone and e.g. charging will be OK?