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qmk-firmware
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qmk-firmware/keyboards/frenchdev/readme.md

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My take on a splitted keyboard

default layout : default layout

the thing when finished : http://imgur.com/a/6FY8v

concept and mockup: http://imgur.com/a/R0vvs

to build :

docker run --rm -e keymap=default -e subproject=v1 -e keyboard=frenchdev --rm -v D:/Repositories/qmk:/qmk:rw edasque/qmk_firmware

The PHYSICAL rows and columns are connected as such :

on right hand (slave) :

          I2C mcp23018
       .-------   --------.
  GND -| 1 VSS \_/  NC 28 |
       | 2 NC       A7 27 |- C15
   R5 -| 3 B0       A6 26 |- C14
   R4 -| 4 B1       A5 25 |- C13
   R3 -| 5 B2       A4 24 |- C12
   R2 -| 6 B3       A3 23 |- C11
   R1 -| 7 B4       A2 22 |- C10
   R0 -| 8 B5       A1 21 |- C9
       | 9 B6       A0 20 |- C8
       | 10 B7    INTA 19 |
  VCC -| 11 VDD   INTB 18 |
  SCL -| 12 SCL     NC 17 |
  SDA -| 13 SDA    RST 16 |- VCC
       | 14 NC    ADDR 15 |- GND
       `------------------'

and on left hand (main) :

              TEENSY
       .------------------.
       | GND          VCC |
   C7 -| B0            F0 |- R5
   C6 -| B1            F1 |- R4
   C5 -| B2            F4 |- R3
   C4 -| B3            F5 |- R2
 LEDC -| B7            F6 |- R1
  SCL -| D0            F7 |- R0
  SDA -| D1            B6 |- LEDB
   C3 -| D2            B5 |- LEDA
   C2 -| D3            B4 |
   C1 -| C6            D7 |
   C0 -| C7            D6 |- GND
       | D5            D4 |
       | VCC          RST |
       | E6           GND |
       `------------------'

we use pull up resistor for SCL et VDA, see https://github.com/ErgoDox-EZ/docs/blob/master/ErgoDox%20EZ%20Schematic.pdf for example

the connector is a standard TRRS (jack with audio + mic)