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Theo <
theom+news@chiark.greenend.org.uk> writes:
> Daniel <
me@sc1f1dan.com> wrote:
>> This past summer was a good time to lower the power bill and overall
>> temperature of the den by transitioning to rpi`s for my computing
>> needs. The main pc was replaced by a pi400. Lovely, silent, low
>> power. Lovely.
>>
>> Well, mostly so. I really don`t like the keyboard and question why they
>> went with it. The full sized keyboard is something I miss, you know,
>> with the full row of function keys, dedicated number pad, full sized
>> arrows, the pageup.down,insert,delete cluster. The keys themselves suck
>> - where they often fail to register key presses and I have to fix
>> spelling quite often. I had hoped that the keys would wear in and solve
>> the problem, but it really just seems to be bad design. Hopes are it`s
>> simply bad luck and a bad keyboard.
>>
>> The problem is easy to solve by plugging in a usb keyboard, but it
>> defeats the appeal and purpose of the all-in-one design.
>>
>> How hard would it be to rig the mobo into a full size keyboard shell?
>> Design a new lower shell of a chosen keyboard to accomodate the mobo and
>> port holes for 3d printing. A search online didn`t yield evidence that
>> it has been done yet. But if this thing with it`s massive heat sync can
>> fit in this small keyboard, it shouldn`t have issues fitting in full
>> sized keybord.
>
>
https://forum.diyperks.com/user-projects/raspberry-pi-400-x-mechanical-keyboard/
https://www.printables.com/model/318803-raspberry-pi-400-mechanical-keyboard-upg
rade
>
https://hackaday.io/project/175844-the-mechanical-pi-400
>
https://www.tomshardware.com/news/orthopi-raspberry-pi-400-ortholinear-mod
I didn`t htink of searching for the keyboards, I actually searched for
`homebrew raspberry pi 400.` They are a good start.
Honestly, I`m not necessarily looking for mechanical keyboards. I`ve
used only membrane keyboards my adult life and, well, my wife often naps
on my den couch while I`m typing along and I think a clicky clacky keyboard
would end that habit. I rather enjoy when she naps in there with me.
I would focus this project mainly on a mass produced full sized keyboard
with a decent sized bottom tray that can be hacked to hold the pi400 mobo.
>
> are a few examples I found by searching `rpi 400 mechanical keyboard`.
> There are no doubt others.
>
>> Found a teardown video and saw a custom ribbon cable utilized to connect
>> the keyboard to the mobo - so that`s a complication. After a bit of
>> searching, they utilized one of the four usb ports in the hub for the
>> keyboard logic.
>
> The keyboard has a Holtek HT45R0072 (one time programmed) microcontroller to
> convert the matrix to USB. Your options are either to repurpose this
> microcontroller, at which point you need to match the keyboard matrix of the
> Pi400 (hard):
>
https://www.40percent.club/2020/12/orthopi.html
I read the same thing - and it would be a pain in the butt since that
microcontroller is, like you said, one time programmed so it`s static.
> or just ignore it and use a USB port. Another alternative is to cut the
> traces to the Holtek (or unsolder it) and use its USB lines:
>
https://www.40percent.club/2020/11/raspberry-pi-400-keyboard-controller.html
This is exactly the information I was looking for. With good documentation, I
surmise I could solder in some wires onto the USB lines and hack in a USB
female. If I were to use a wired USB keyboard, I could cut the wire
short, rewire the male usb port, and plug it into the female one I hack
in. That way, if I want to replace the keyboard with something new, it
would require no new soldering.
Or I could make it permanent by cutting the wire short and solder them
into the board. I have some reading to do.
I saw the orange pi 800, which I hadn`t heard of before. I considered
buying it instead but it`s way more expensive and the keyboard looks
just as junky. And 4gb of ram shut me down.
Thanks for the info.
Daniel
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