Technical build info for the AT101 Split56 custom programmable keyboard
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AT101 Split56 "GhettoDox"

Before and After Latest update

Easy AVR Install instructions

Put or otherwise copy the contents of the handwire.cfg and handwire_hardware.cfg files to easy AVR's config directory. You may need to modify your handwire_hardware.cfg file to reflect the appropriate pins you use on your teensy. Two of the columns experienced issues with my teens, so I moved them, making it a little harder to wire and less logical.

Build log album:

Physical Layer Layout

Easy AVR display Physical to logical matrix layout Matrix and layout Notes on the Physical Layout

The presumption of the layout is that the top most keys in the thumb clusters (Alt and FN2 in this case) are the most easily accessible secondary cluster keys for your thumbs, and the long keys (FN, right Space) are where your thumbs rest. If the bottom secondary key is easier to press for your thumbs and your ergos, swap Alt for Space and FN2 for |. Also keep in mind there are keys you'll press and hold while reaching (FN2 for example) and keeping those higher will probably be more comfortable.

GUI Layout on


Layer 0

`~  1!  2@  3#  4$  5% 6^         7&  8*  9(  0)  -_  =+ 
Tab  Q   W   E   R   T            Y   U   I   O   P   [{  ]} 
Ctrl A   S   D   F   G             H   J   K   L   ;:  '" 
Shift Z   X   C   V   B              N   M   ,<  .>  /? 
                       Alt        FN2
                   Space  FN  Space \|

Notes on Layer 0

Missing keys The default layer is missing Enter, Backspace, Right Shift, all Windows (GUI) keys, all function keys, arrows, and the Home/End cluster. These have been given a high priority on the first function layer (FN1), which means your thumb needs to be quick on the FN1 key to maintain basic function. You may consider using a lighter switch for that key.

Left Space is primarily for scrolling (space on a webpage scrolls down, Shift+space scrolls up) when your right hand is already on the mouse. This might not be part of your workflow, in which case, it was previously an App key.

Layer 1

Mply  F1  F2  F3  A+F4  F5  F6          F7  F8  F9   F10    F11 F12 
Tab  Esc  FN3 EnterApp  T             Y   U   M4  M5    Play    Vol- Vol+
Ctrl A+Tab Tab C+L A+F  A+G               Lf  Dn  Up    Rt     ;: Enter
Shift Z    X  C+C  C+V   B               Del Bksp C+S+Tab C+Tab  /? 
                         Alt         FN2
                    Space  FN  A+Space  Mute

Notes on Layer 1

4 to Alt F4 seemed obvious since I don't use F4 for anything else

A to Alt+Tab as a quick switch in windows.

D to Ctrl+L evolved from Alt+D to get to the URL bar, but Ctrl+L is more universal and reliable in windows which chokes on Alts some times

F to Alt+F is to shortcut to the File menubar

G to Alt+G is a native shortcut within Siebel, probably not useful to many

C and V to Ctrl+C and V are easy shortcuts when you're already holding down FN

W to Function Layer 3 (FN3) is for mouse control and was selected because it was comfortable to hold. You may prefer to swap it for E if your middle finger is easier to hold here.

HJKL to arrow keys because Vim

N and M to Del and Backspace keep those keys near eachother and make Control on the left easier

< and > to Ctrl+Shift+Tab and Ctrl+Tab is about switching between browser tabs easily

i and o are macros to Ctrl+B,p (switch to prevous buffer in tmux) and Ctrl+B,Ctrl+o (switch panes and focus on new pane)

' to enter is trying to work around the muscle memory. It's not working so far.

Mply is the live macro playback, and was selected on a tenkeyless layout, which put the function an ~ closer together. Not sure if it'll survive here or be moved.

Space to Alt+Space is to open the windows context menu

Layer 2

Mrec 1!  2@  3# 4$  5%  6^      7&   8*  9(   0) Conf BOOT
M7  M1  M2  M3  W+R  M6          Y    U    I    O  PtSc C+A+Del W+L
Ctrl A   S   F   D   G          Home PgDn PgUp End  ;:  Enter 
Shift Z   X   C   V   B           N    M   C+PgUp C+PgDn /? 
                        Alt         FN2
                      App  FN   Space  \|

Notes on Layer 2

Mrec is the live macro playback, and was selected on a tenkeyless layout, which put the function an ~ closer together. Not sure if it'll survive here or be moved.

Q is M1 which is a macro which prints my email address.

W is M2 which is \ESC,:w\ENTER, which saves in vim. It helps that it's W

E is M3 which is exec('''\CTRL(v)''')\ENTER, which runs the pasted block of code in Python IDLE, which can't handle the newlines of a regular paste.

R is Win(GUI)+R to open a Run dialog in windows, which is one of the few things I actually use the windows key for.

T is M6 which is [^\,t]+\,t which is a regex I repeat commonly and is annoying to type out repeatedlly.

[ and ] are CTRL+ALT+Delete (which is hard to type on this layout), and Window+L to lock your screen (The second and only other reason I use the windows key.

< and > become CTRL+Page Up and Down to flip between excel sheets easily. Depending on which you use more, you might want to swap these with the same keys on layer 1 if you Excel more than you tab browse.

Layer 3

 `~  1!  2@  3#  4$  5%  6^        7&  8*  9(  M14 Conf Boot
Tab  Q  FN3  E   R   T            Y   U   I   O  PtSc [{  ]}
Ctrl A   S   F   D   G           Mlf Mdn Mup Mrt MB1 MB2 
Shift Z   X   C   V   B             N   M   ,<  .>  /? 
                        Alt         FN2
                      App  FN   Space  \|

Notes on Layer 3

Layer 3 is generally mouse control and less used macros.

HJKL have been changed to arrow keys for mouse movement with ; and ' being used for left mouse and right mouse. The pinky is not ideal for many presses, so "I" might be better if you use the mouse to click often. Also note, HJKL does not support common diagonal movement without moving fingers from the home row. You might be more familiar with a wasd to ijkl style layout.

Mouse assist mode

I'm testing setting layer 3 left side with a toggle for common functions I need to do with my right hand while it's on the mouse. Important keys like arrows, backspace, delete, browser tab change (that isn't home-row-moving like Ctrl+Tab or Shift+Ctrl+Tab), Page up/down, or Siebel record changes (Alt+< or >) should be accessible from the left side only while mousing with the right hand. Since the layer is toggled and "locked" while it's on, I've set the lone LED to turn on when it's on to indicate the mode so I don't get lost. Interestingly, the momentary key FN3 toggle (FN+W) works perfectly for keyboard mouse controls when my right hand is on the keyboard though on FN3 the W is assigned to the WASD arrow cluster. It works as a temporary on, while FN+B=FN3 (with Easy AVR Toggle mode) on both FN and FN3, work great. Once I lock on the layout, I'll update it here.


Enter key is bugging me. There is room to weld on another switch holder from the pieces of the plate I have left without increasing the footprint much, but I might just need more practice. Logically, the extra key can be the phantom key left of N. (which was originally intended to be a fourth key on the left thumb cluster) Until then, my right pinky just falls off into the abyss like when you go up the last step in a staircase, and think there is another step and your foot falls straight through your perception of reality.

Latest: The enter key is becoming an issue. Much like I slur the spacebar (which, incidentally prevents me from using it as a tap key) I slur the enter key, which requires I press the FN key, which changes the other keys I may be typing.

Right shift missing is a bit odd reaching for ~ or !. I dropped it off without worry given there was zero visible wear on my QFR's right shift.

Caps Lock has that silly divot between it and the A, and makes me reach further. The profile of the key doesn't make turning it over much of a solution. Might have to fill it in or chop the original enter key (same row/profile) down and put it there.

The rotation of the left side is making my muscle memory for some "inside" control functions harder. Mostly Cut and Undo. I might have to function key those as I have Copy and Paste

Considering some kind of mouse-assist layer for common functions I need when my right hand is on the mouse. Ideally F3 since it's so unused on the left side. Stuff like Delete, Backspace, possibly arrows. I'm trying to keep a record of whenever I have to take my hand off the mouse to press a key on the right side. Which is somewhat easy because it's annoying for me to have to do.

Ergonomics Notes

Still figuring out the most at-rest position for everything. Both thumb clusters need to move inward, particularly the left one, which I didn't realize was so far over

The FN switch is TOO tactileI actually think the function key needs to be more worn out. I press it so much I'm catching failures to press it.

After using tins to raise the angle of both sides, I found it quite comfortable and only noticed wrist issues at the end of the day, but they were cumbersome to carry and kind of noisy, so I tried taking them away and running them tented slightly against the laptop. Immediately the wrist issues increased, so I'm going to find a way to flat-pack or flip-out stands for both sides.

Other Files

kerf test is an SVG of 9 Alps switch holes generated with swill's board maker with various kerf settings. They vary from .1mm to .9mm in the order of a telephone; .1 in the top left, .3 in the top right, .9 in the bottom right. Make sure you test both sides of the material you cut into. Thicker materials may have different kerf on top vs bottom.