Replicazeron FreeCAD

modified parts for QMK powered replicazeron build with STM32F103

This repo only contains complementary parts to this project:

DIY Azeron

Features

• 23 keys
• analog stick with WASD emulation
• 5-way dpad
• OLED display displaying status info and basic configuration
• 2 status LEDS
• 6x WS2812 RGB-LED lighting
• layout editing and oled control from PC using VIA or Vial without the need to reflash the firmware

BOM

tldr BOM

In addition to the BOM required for the DYI Azeron & the modified printable STLs from this repo you will need the following parts.

The listed parts are only what I used to build the Replicazeron. With minor changes to the configuration a build should be possible with any other MCU & display that is supported by QMK.

part	function	quantity
STM32F103 dev board	MCU	1
ssd1306 128x32	display	1
WS2812 (on strip)	addressable LEDs	6
M3x10 ISO4762 "cheesehead"	display * LED attachment	2
1N4148 diodes	switch matrix diodes	30
leftover ethernetwire	wireing & liner	<2m
bit of bread board		~8x13 holes
2.56mm pitch pin headers		~50
dupond jumper wires		~25
some shrink tube

MCU

Recommended MCU is an STM32F103 on a bluepill dev board.

A build is also possible with an ATmega32 promicro, but this dev board does not have enough GPIOs to attach a LED strip.

Display

This build uses a ssd1306 OLED with 128x32 pixels. The 128x64 pixel version of the ssd1306 should also work but would need a modified housing.

Adressable LED strip

For optional lighting an addressable WS2612 LED-strip with 6 LEDs is used.

Wires

I used a bit of old network cable to get some easily distinguishable wires. Bonus: The shielding can be used as a nice looking liner to route the cables from the fingers to the base.

To connect the wireing to the MCU I used 2.56mm pitch dupond wires, pin headers and a bit of bread board.

For the switch matrix to work you will also need 30 signal diodes (i.e. 1N4148).

Fastener(s)

In addition to the fasteners required for the DIY Azeron you will need one M3x10 screw to attach the display

Prepare devboard

This step is only required once.

STM32F103 bluepill

Install the stm32duino bootloader from this repo. The correct prebuild binary for a stm bluepill is binaries/generic_boot20_pc13.bin

Flash the bootloader with stlink.

ProMicro (atmega32)

Install caterina bootloader on you promicro

HowTo: Build & flash QMK

• clone firmware

  git clone https://github.com/9R/qmk_firmware

• setup qmk environment via package management or in python venv

  python -m venv venv
  source venv/bin/activate # you'll need to repeat this after leaving the venv. the other steps only need to be executed once
  pip install qmk

• Set qmk defaults

  #set default keyboard:
  qmk config user.keyboard=handwired/replicazeron
  
  #if you are using a promicro specify the variant:
  qmk config user.keyboard=handwired/replicazeron/promicro
  
  #set default keymap:
  qmk config user.keymap=default

• VIA support (optional)

  This is necessary to use replicazeron with VIA since the removal of via keymaps from QMK in August 2024.

  # clone userspace keymap repo
  git clone https://github.com/9R/qmk_userspace_via
  
  # add userspace repo to qmk config
  qmk config user.overlay_dir="$(realpath qmk_userspace)"
  
  # set default keymap to via
  qmk config user.keymap=via

• Build firmware

  cd qmk-firmware
  
  qmk compile

• First time flash firmware with dfu-util

  dfu-util -a 2 -d 1EAF:0003 -D .build/handwired_replicazeron_stm32_via.bin

• After qmk is running on the controller, build and flash in one go with

  # pressing the pinky button second closesed to the palm on the settings layer in default mapping will activate reboot to lash mode
  qmk flash

Wireing

Use the schematics as reference.

Columns 1 to 4 are the finger towers, the last column attaches the 5way dpad.

Rows 1 to 5 are wired to button 1 to 5 on each finger.

The sixth row is used to connect "special" keys like side keys, analog click and base key.

Thumbstick click

To read the thumbstick press via the key matrix you will have to cut some traces on the analog stick pcb and solder the colmn & row wires directly to the button pins.

Usage

Default Keybindings

The default firmware has four input layers. The name of the active layer is displayed on the OLED-screen.

To cycle through layers press the button on the right side of the base.

Layer 0: Default

Layer 1 & 2: Shooter / Misc

The second and third layers have no keys assigned by default execpt for the D-Pad and the change-layer-key.

Layer 3: Settings

Tumb Stick Modes

The thumb stick can operate in three modes: WASD, WASD + Shift and Joystick.

In any mode the thumb stick position is available as two axis analog joystick.

The active mode is displayed on the OLED and can be changed on the settings layer (ThumbMode key).

Mode	Explanation
WASD	w a s d key presses based on the position of the thumb stick
WASD + Shift	w a s d below and W A S D if thumb stick is above _SHIFTZONE threshold
Joystick	WASD-Emulation is inactive

Customization

Keybindings

Default keybindings can be comfortably edited with VIA or Vial in a webGUI or standalone application. Changes made with the GUI will be saved on the replicazeron, do not require the GUI to permanently run and are persistent over reboots and reflashes. Press Clr ROM key to reset to defaults.

Additionally multiple layout presets can be saved and loaded with the GUI on/from a PC.

Even though not recommended, it is also possible to edit default keybindings in the code.

Available keycodes and their meaning can be found in the QMK documentation.

Replicazeron specific keycodes

Key	Function
Reset	Reset Controller (to enter firmware flash mode)
Clr ROM	Clear EPROM. Resets to defaults (keybindings / LED animation)
ThumbMode	Cycle through thumbstick modes
AutoRun	Toggle autoRun

Thumbstick

The three parameters, that control the way the thumb stick WASD-emulation behaves currently can only be modified in the source code.

While on the settings layer the OLED display shows debug info that can be used to quickly find alternate values matching personal preference.

Parameter	Meaning
_DEADZONE	Distance from center where no keypresses are send
_SHIFTZONE	Above this distance from center W A S D instead of w a s d will be send in WASD + Shift mode
_THUMBSTICK_ROTATION	Modify to adjust the "forward direction"

Related repos

replicazeron qmk-firmware fork

replicazeron via-keyboards fork

replicazeron vial-qmk firmware fork

replicazeron STM32F103 bluepill schematics

Pictures