Using Android tablet as RISC OS display

I think I was saying albeit not very well John that you essentially seem to have already invented a potential new laptop by getting a screen working in the form of a tablet. It’s your idea I was just saying yeah the bit I did mouse, keyboard etc just worked and combining your idea.

Re-reading this by you, David, I realise that you are talking about mouse and keyboard on the tablet USB via a hub as well as the capture device, whereas my practical solution to my original problem will be to have the wireless combo of mouse and kbd from a wireless USB dongle plugged into the Pi itself.

There are so many different ways of thinking about how to connect things that work but have different pluses and minuses!

Out of devillment I tried plugging the capture card into a USB port on my Sony Bravia TV, but this did nothing; presumably a webcam would give the same, as I assume cam software is not (yet?) incorporated into the TV software. But that could’ve been another alternative route to displaying a “screen” .

Raspberry Pi Zero plugged in to a tablet over USB / OTG, appears as a web cam or capture device, but sends the desktop. To potentially see desktop open camera app on tablet. Usbc from tablet could provide power to a pizero. Usb hub from pizero can have usb mouse, keyboard and network. It could have a wireless dongle or two. Dunno if that’s possible. I have 46 courses to do some am a little tied up.

If that’s possible then no ten pound capture card (the ones I tried said they could easily do resolution of desktop but output looked not correct and rubbish). Vnc was/is slow due to sending whole screen instead of bits that changed. Rdp was not available or not suitable. I did manage to control the mouse in a way similar to what AL described a bit later as magic wand on his website bit it was a bodge that I did and not a professional solution. Vnc is probably ok on modern hardware.

I used cheese or obs studio with the capture card and somehow got mouse working. The magic wand was stumbled on either when playing with monitor outputs or capture card or plugging in rpc and mini.m and iyonix on a usb kvm, a few pis too. Things got complicated and was a long time ago. Seemed to work ok generally on kvm though. I think I had mouse and keyboard over vnc and just switched monitor output to display screen of ro desktop not connected to mouse and keyboard. I think andy m is right if my previous post isn’t possible a good rdp setup would be good as a long time ago my playing made me reach the conclusion that i needed a more expensive capture card.

I have try this HDMI2USB capture stick. Is working with USB endoscope camera software but not with software called USBCam.

As I mentioned on my blog, just yesterday, USB camera software isn’t equal. One program (USB Camera Viewer) messes up and eventually crashes. Another (nExt Camera) works fine, but no sound.

The device is the cheap one mentioned further up the thread.

Yours will be the exact same chip as mine inside…

My original capture device looks the same as Raik’s and is around the same price point – but, as we all know, what is actually inside remains a mystery without a manufacturer and full specification.

And, as Rick says, they’re probably all based on the same chip, but any peripheral circuitry may differ.

But mine works for me, although I haven’t tested the HDMI sound, as it’s not relevant to my specific use.

they’re probably all based on the same chip,

If it’s a USB 2 device, it’s probably a Macrosilicon MS2109. If it’s a USB 3 device (peer into the USB plug to see if it’s 4 contacts or more) then it’s probably a Macrosilicon MS2130.

Easy way to tell? The prices are from Happy Meal to adult meal.
Other devices cost a LOT more.

what is actually inside remains a mystery

Not really. USB devices have IDs. I can’t tell you mine as Android doesn’t appear to make this information available.

Google tells me: VID 534D, PID 2109.

and full specification.

Dream on. For half of my exploration I relied upon Chrome’s automatic translation (from Chinese). Detailed data sheets for these sorts of things don’t exist. Some have hacked (like https://github.com/amnemonic/MacroSilicon) but that seems to be about it…