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Anyone built a Pi-KVM? HDMI/CSI adapter question

Discussion in 'Small Form Factor and Single Board Computers' started by TangoEchoAlpha, 1 Sep 2021.

  1. TangoEchoAlpha

    Wise Guy

    Joined: 13 Jun 2016

    Posts: 1,200

    Location: UK

    Wondering if anyone has built a Pi-KVM on the forums? I am thinking about it as a project, so I could VNC into my work laptop from my main computer. Really it has to be a KVM solution as I can't install any extra software/run any software on the work laptop.

    I'd be very interested if anyone has done it - in particular, which HMDI to CSI-2 bridge you used. The official docs suggest to use a HDMI/CSI adapter based upon the Toshiba TC358743XBG chipset and links to an adapter on AliExpress. I would rather buy an adapter/bridge more locally if I can and was wondering if something like the Waveshare HDMI to CSI adapter on the rainforest would work?

    Or can I use any CSI/HDMI adapter? If anyone can suggest one to get from the usual Pi places, would be very grateful :)
     
  2. jrwagh333

    Soldato

    Joined: 20 Aug 2008

    Posts: 5,719

    Have you taken part in the Kickstarter for the HAT? Looks great.
     
  3. TangoEchoAlpha

    Wise Guy

    Joined: 13 Jun 2016

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    Location: UK

    I'd seen it, but not backed it yet. Have you put in a backer pledge then?
     
  4. jrwagh333

    Soldato

    Joined: 20 Aug 2008

    Posts: 5,719

    Unfortunately it's too rich for my blood. I'm going to try and do it DIY
     
  5. TangoEchoAlpha

    Wise Guy

    Joined: 13 Jun 2016

    Posts: 1,200

    Location: UK

    Yes, I felt the same. I'll quite happily donate / Patreon the Pi-KVM project if it turns out to be something I find useful, but felt that HAT was a bit pricey. Same for the TinyPilot, great idea but also more than I'd like to spend on a home KVM. I guess relatively speaking though, it's still cheap compared to a 'proper' IP KVM.
     
  6. TangoEchoAlpha

    Wise Guy

    Joined: 13 Jun 2016

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    Location: UK

    @jrwagh333 I have just ordered one of these:

    https://www.ebay.co.uk/itm/USB-C-PWR-Splitter-/203570218304

    As Pi Hut and Pimoroni were sold out. Looks like one guy making them and perhaps the interest in Pi KVM of late has used up all his stock?

    I've also got a HDMI/CSI2 adapter, went for the Waveshare one - so once the splitter arrives I should be in a position to try it out :D
     
  7. jrwagh333

    Soldato

    Joined: 20 Aug 2008

    Posts: 5,719

    Had my eye on that USB splitter from PiHit, but like you said it keeps going out of stock.

    Please let me know how you get on
     
  8. Buffalo2102

    Wise Guy

    Joined: 9 Jun 2004

    Posts: 1,228

    I built one to use in the same way as you - remote into work laptop which is completely locked down.

    I used the Waveshare adapter you mention above and it works well.
     
  9. jrwagh333

    Soldato

    Joined: 20 Aug 2008

    Posts: 5,719

    Is it possible to link the adaptor please?
     
  10. Buffalo2102

    Wise Guy

    Joined: 9 Jun 2004

    Posts: 1,228

  11. TangoEchoAlpha

    Wise Guy

    Joined: 13 Jun 2016

    Posts: 1,200

    Location: UK

  12. Buffalo2102

    Wise Guy

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    It's gone up since I bought it too. :D
     
  13. TangoEchoAlpha

    Wise Guy

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    Location: UK

    Thought I'd chance my arm with an Amazon chat, see if I could get a credit for the difference. Nope, but they would be happy for me to return the one I have and place a new order with the cheaper one. Sadly common sense with Amazon policies did not take place :(
     
  14. Buffalo2102

    Wise Guy

    Joined: 9 Jun 2004

    Posts: 1,228

    Nice try though.
     
  15. TangoEchoAlpha

    Wise Guy

    Joined: 13 Jun 2016

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    Location: UK

    :D I did make the point about the cost to Amazon in terms of processign the return and a new order, even played the 'environmental impact' card. Customer rep wasn't having any of it, be he's good at poker is all I'll say :D

    What solution did you use for powering your Pi-KVM? I was getting ready to splice two cables together, but if that power adapter arrives then it might be a more elegant solution for not a lot of cash.
     
  16. Buffalo2102

    Wise Guy

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  17. TangoEchoAlpha

    Wise Guy

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    Location: UK

    Do you not get any low current warnings on your Pi? I ask as I had looked at other similar Y cables, but couldn't find any that were rated for ~3 amps like the official Raspberry Pi 4 power adapter?

    The Pi-KVM project also recommends one of these if you don't want to start hacking cables, like a data 'condom' to prevent juice jacking, but this one removes the power pins - https://www.amazon.co.uk/PortaPow-USB-Power-Blocker-Cased/dp/B094FYL9QT
     
  18. Buffalo2102

    Wise Guy

    Joined: 9 Jun 2004

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    I get an amber warning for undervoltage detected but I've been using it for around 10 hours a day, 5 days a week for more than a month now and haven't had a single hiccup with it. YMMV I guess.
     
  19. TangoEchoAlpha

    Wise Guy

    Joined: 13 Jun 2016

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    :)

    Thanks, useful to know. Will wait and see if that £3 adapter turns up, otherwise I'll get a Y cable or get my soldering iron out (probably the latter)
     
  20. TangoEchoAlpha

    Wise Guy

    Joined: 13 Jun 2016

    Posts: 1,200

    Location: UK