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I'm using the adapter that you see below to attach a VGA monitor to my smartphone and I see on the monitor what I see on my smartphone (samsung note 3) :

enter image description here

now,what I want to do is to find the working hub / adapter to attach also a keyboard and a mouse to use with the phone. I want to do these tasks simultaneously :

  1. using my old VGA monitor instead of watching on the phone screen
  2. using mouse and keyboard at the same time
  3. keep powered on 1 and 2 while I'm using them
  4. power on the hub adapter with an external power source

After some research I found this adapter and I bought it :

https://www.amazon.it/Adaptor-TUSITA-Charging-Adapter-Raspberry/dp/B078M3Z84Z/

it works only if I attach the micro usb connector directly to the android phone. If I connect the micro usb connector to the vga adapter and the otg cable to the USB port of my pc and on the USB ports of the hub I attach a mouse and a keyboard,the VGA monitor works,but I can't use any USB devices because I see that they aren't reached by the power.

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  • I'm lost at the last part.. could you elaborate more? – Cubic273.15 Jan 7 at 14:52
  • check this picture to understand what I mean : ibb.co/7jgDL6r – Marietto Jan 8 at 12:10
  • add my answer for you to understand why – Cubic273.15 Jan 8 at 13:35
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Explanation

The IC / microcontroller in your VGA adapter couldn't simultaneously convert the signal from USB to VGA (display) and providing a USB hub.

There is plenty of reason for that part :

  • The signal of USB data and VGA signal is different you can only choose either one of them.
  • The USB port only for the external device when the VGA is OFF, meaning the signal will switch back to USB data.

VGA signal:

VGA signal

USB signal:

USB signal

See the difference?

Source:

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  • yes,thanks. what's the solution ? which adapter I need to achieve my goal ? – Marietto Jan 8 at 16:03

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