Dongle Display

This module repository provides a ZMK shield that replaces the built-in status screen with a custom screen designed for 128x64-pixel OLED displays, or 128x32 with some limitations.

Usage

To use this module, first add it to your config/west.yml by adding a new entry to remotes and projects:

manifest:
  remotes:
    - name: zmkfirmware
      url-base: https://github.com/zmkfirmware
    - name: englmaxi
      url-base: https://github.com/englmaxi
  projects:
    - name: zmk
      remote: zmkfirmware
      revision: main
      import: app/west.yml
    - name: zmk-dongle-display
      remote: englmaxi
      revision: main
  self:
    path: config

Next, replace the built-in status screen by adding dongle_display to your build.yaml:

---
include:
  - board: seeeduino_xiao_ble
    shield: sweep_central_dongle dongle_display

This shield assumes that the dongle is already set up and functioning with the built-in status screen. For setup examples, refer to the shields in my zmk-config.

• If you are using the larger 1.3" OLED, replace solomon,ssd1306fb with sinowealth,sh1106 and set segment-offset = <2>.
• If you are using a nice!nano, replace xiao_i2c with pro_micro_i2c.
• If you are using the smaller 0.91" OLED, replace height = <64>; by height = <32>;

Widgets

• active hid indicators (CLCK, NLCK, SLCK)
• active modifiers
• bongo cat
• highest layer name
• output status
• peripheral battery levels

Configuration

To also display the battery level of the dongle/central device, use the following configuration property:

CONFIG_ZMK_DONGLE_DISPLAY_DONGLE_BATTERY=y

If you want to use MacOS modifier symbols instead of the Windows modifier symbols, use the following configuration property:

CONFIG_ZMK_DONGLE_DISPLAY_MAC_MODIFIERS=y

Smaller OLEDs, with 128x32 pixels

To allow smaller OLEDs, with 128x32 pixels, it will be necessary to exclude some widgets, like the bongo cat, active modifiers or the highest layer name. You can do it with the following config entries:

CONFIG_ZMK_DONGLE_DISPLAY_BONGO_CAT=n
CONFIG_ZMK_DONGLE_DISPLAY_MODIFIERS=n
CONFIG_ZMK_DONGLE_DISPLAY_LAYER=n

It is also necessary to reduce the buffer size, otherwise the I2C communication can become unstable:

CONFIG_LV_Z_VDB_SIZE=32

Demo

Dongle Designs

• case1
• case2
• Cyberdeck by @rafaelromao
• Dongle PCB by @spe2
• Macintosh by @rain2813
• Redox by @rurounikexin
• sai44 Dongle by @leafflat
• ZMK Display Dongle by @yingeling
• ZMK Nice Nano 128x64 OLED Dongle by @James_909973
• Dilemma DIY with 128x32 OLED

Alternatives

• Prospector by @carrefinho
• YADS by @janpfischer