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    Custom HDMI adapter....

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    hdmiadaptercustom
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    • F
      FormulaFox
      last edited by FormulaFox

      This entire forum is likely not the best place for this, but I have no idea where to inquire about something like this, it IS relevant to my future plans with my Retropie device, and as I've gotten good advice and direction here before I'm hoping I can at least be pointed to the right place on the Internet to get the needed information.

      A friend of mine recently got a Pi 4 for his own projects, and using the HDMI display on my GhettoPi we've confirmed, unsurprisingly, that the only hardware issue preventing us from using small HDMI displays in the proper compact form is that that mini HDMI ports on the Pi 4 don't have a compact adapter.

      (full disclosure: It works as a DISPLAY, we never tried to get touchscreen drivers working)

      So, we want to make our own. Now, we know soldering will be require to make this work - there is no plug and play(unless you want to buy Miuzei's new touchscreen that comes with a compact adapter which is not presently available standalone), and neither myself nor my friend have soldering skills... But we've always wanted to learn, and screwing this up won't ruin anything other than the HDMI adapter we're trying to make. So this seems like a decent thing to learn with.

      So, anybody got an idea where to start looking?

      (for the record, we tested the display by tinkering with Lakka - don't worry, I am not planning to betray Retropie, Lakka already having a Pi 4 build just made it easier to test that way than doing the roundabout methods required to make Retropie work on the Pi 4 at this time)

      EDIT: I also have a spare 180-degree HDMI U-adapter with my now-unused WaveShare Game Hat. The display I use with my GhettoPi came with another, so I might be able to use the spare one for this.

      EDIT 2: I have just found the adapters for sale on eBay, so I no longer NEED to do this. However, I would still like the requested advice as I'm feeling I should learn soldering regardless, and I do feel this would be a good project to really learn with - it's more advanced than just splicing a cable(which I'm sure I could learn well enough after 5 minutes on Google), but like I said before poses no risk to the expensive hardware.

      mituM 1 Reply Last reply Reply Quote 0
      • mituM
        mitu Global Moderator @FormulaFox
        last edited by mitu

        @FormulaFox said in Custom HDMI adapter....:

        A friend of mine recently got a Pi 4 for his own projects, and using the HDMI display on my GhettoPi we've confirmed, unsurprisingly, that the only hardware issue preventing us from using small HDMI displays in the proper compact form is that that mini HDMI ports on the Pi 4 don't have a compact adapter.

        The Pi4 doesn't have a mini HDMI port (as the Pi Zero), it has 2 micro HDMI ports. If they have similar pinouts, you just need to connect the corresponding pins on each device, something like this

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        • F
          FormulaFox
          last edited by FormulaFox

          I am absolutely terrible at properly identifying and recalling mini and micro HDMI ports on devices. I'd have gotten it right by the time I need to order parts(since I ALWAYS doublecheck when money is involved), but I doubt this will be the last time I make this mistake while I'm talking about this stuff.

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          • mituM
            mitu Global Moderator
            last edited by

            This happened to a lot of people with the new PI4 model - thinking they can re-use the miniHDMI cables they had for the Pi Zero.

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