zmk keyboard Macintosh dongle display

A receiver I made to go with my retro Cygnus (Cygnus 1.0) keyboard.

For the receiver end of a zmk firmware keyboard, it displays keyboard information.

Pros:

• Allows zmk keyboards to switch from Bluetooth to 2.4g connection, providing a more stable signal.
• If you are using a split keyboard, it will save power. A 400mah battery will extend the battery life of the main keyboard from 1 month to 9 months.
• Displays comprehensive information such as battery level.
• Cute cat.
• Retro.

Cons:

• Higher cost.
• It's not portable for some portable keyboards.

Bill of materials:

• 4x2mm magnets
• 1.3-inch I2C OLED display
• 1mm thick light gray acrylic
• Any small reset button
• Meihua Ge nrf52840 nice!nano