deskthority

Other than those two things, is it the same process as writing the code for an AVR based firmware? I've heard that they have to be written differently.

I'm using QMK to make my layout for a typewriter conversion. The problem is, since I'm building the firmware as if it were for a Pro Micro, and then converting it to a Proton C layout (using CTPC=yes), I'm still limited to the available 18 pins on the Pro Micro and can't use the full 23 available ...

Now, to get that firmware written... Perhaps I could help you with that if you are not a programmer yourself.


Well, I've gotten the matrix completely finished, and I've gotten my hands on a Proton C controller! Now for the very hard part. I've been reading through all the QMK documentation, but ...

I would love to use them as an Fn key, but the problem is that they are all wired to the same location, so I (essentially) have 5 keys that would behave the same way on the second action, right?

Hey, sorry about the absence, I've been on vacation. And it appears that the 16 and 18 keys aren't actually connected, it was simply an error on my part.

HOWEVER, it has proven that all of my double action keys (16, 32, 47, 60, 63) have their second action (hard press) aligned with the same combo ...

Hey, thanks for the help! Those two matrix images are really helping my brain comprehend this. I'm nearly through creating the actual matrix (as far as the intersections of rows/columns goes) but I seem to have hit another road block. It appears that two of my keys (in this case, the "16" key and ...

Oh wow! I thought I had a pretty good handle on how to go about this, but now I see I'm quite a ways off. I'm having trouble with really figuring out the matrix. I'll have to do some more research when I'm off work.

Another question, since you seem extremely knowledgeable about this kind of thing ...

It looks like the "C" is indeed a common pin. Does this mean that the sliders on the side would count as one single "constant" pin, but with 9 different possible values? I'm not entirely sure how to conceptualize the sliders, honestly.

Also, when we say "map out the matrix," we do mean to write ...

I'm almost done mapping the matrix, and it seems that they don't cross connect anywhere, but instead it appears to be a way to consolidate many of the diode-sides of the pins into a single pin out. I'm not entirely sure how to deal with this, but I could just as easily chop the jumper that is ...

I see. So I would just have to destroy the bridge between the two sets of traces? All should be well as long as each one of my keys is being represented SOMEWHERE along one of my pins?

if that controller has enough pins to cover both of the ribbon cables then you are ok. the reason to go with a Teensy++ is just the amount of pins that you have access to. if you are wireing a full sized board then often the matrix would have a greater number of pins that the smaller controller ...

No, the electrical matrix does not have to follow the physical layout of the keyboard.
I think it also looks a bit more random than it really is, only because it is a one-sided circuit board and the designer had to be a bit clever with the routing to make everything fit with jumpers and all.

I ...

yes this is certainly possible as long as you have the matrix then you can indeed just wire up a teensy instead of the ribbon cables. might be worth confirming the matrix using a multimeter on continuity going between the ribbon cable and the switch pin but other then that you are good to go ...

I bought an old typewriter at Goodwill and disassembled the main keyboard/pcb from the rest. It currently has two ribbon cables hanging off that at one point connected the keys to the logic portion of the machine.

Is it possible for me to trace the traces, and directly connect a pro micro to the ...

It depends on the switch.

Do you have a multimeter ?


Unfortunately I don't have a multimeter. I should probably pick one up sometime, considering their utility, though.

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it should have mitsumi standard mechanical and the switches with 4 pins should be https://deskthority.net/wiki/Mitsumi ...

Hey guys. I bought an Olympia Electronic Compact typewriter with the intention of recycling its switches for use in a hand wired board. The problem is, most of the switches have two pins on the bottom, just like MX switches, but some of the switches (like the space bar) have 4 pins. Does anyone know ...