pyKeyboardOS

A Real-Time OS built for Keyboard using CircuitPython.

Software

Files

• module/keyboard: Circuit Python Keyboard(usb & ble)

Usage

Circuit Python Keyboard

• Fn + Q: connection via right usb type-c

• Fn + W: connection via upper usb type-c

• Fn + E: connection via bluetooth

• Fn + BackSpace: erase saved bluetooth info(use when connection error)

• Fn + TAB: switch rgb lighting mode

• Fn + UP_ARROW: light++

• Fn + DOWN_ARROW: light--

• Fn + Home: PageUp

• Fn + End: PageDown

• Fn + Esc: PrtSc

• Fn + 1-10,-+: F1-12

Changes

2024.11.17

• Final Report

2024.11.05

• Unlocking the Key to CircuitPython: Crafting Custom Keystrokes for a DIY Keyboard

2024.11.01

• Fix Bluetooth(hardward issue)
• Add Basic RGB colors
• 6-key sequential(via upper usb type-c)

2024.10.21

• Update PCB adaptation
• Disable BLE

2024.10.08

• Middle Term Report
• Final Goal: Basic Keyboard + Sleep Mode + At Least One Modular Module (Camera, Screen, Numpad, etc.).

Basic Keyboard

• Connection via USB or BLE.
• Basic RGB lighting
• Basic key mapping

Sleep Mode

• Auto-sleep (low power mode)
• Low-latency waking

Modular Modules

• Camera
• Screen
• Numpad
• Knobs
• Motor

2024.10.05

• Add independent camera code

2024.09.27

• Set the CH9329 as the default connection.
• When using the CH9329 connection, if more than six keys are pressed simultaneously, the additional (beyond six) keys will be released in the order they were pressed.

Tracking

• wpa2 enterprise support: zephyrproject-rtos/zephyr#78921

Hardware

Prototype Keyboard Case Design

• Foot Pads: Completed √
• Li Battery: Completed √
• Upper-side USB port: Completed √
• USB HUB: Testing
• Dry Battery: Designing

S68K7 2024.10.28 (Unstable, debugging)

Schematic Diagram (Non-final version, proceed with caution.)

PCB (Non-final version, proceed with caution.)

S68K7

• The voltage of the dry battery boost system is low.
• When powered by USB, the battery pin voltage of the IP5407 should not be left floating.
• There is a conflict between the two USB ports.

S68K6 2024.10.13 (success; Prototype 2)

• Use IP5407 power circuit(works fine).
• Add USB Type A for external power supply.

S68K5 2024.9.30 (failed; power)

• Use SX1308 power circuit(significant error)
• Place the battery interface on the top
• Thickness of the main control board
• Front height, foot support
• Check key position coordinates

S68K4 2024.8.26 (partial success; Prototype 1)

• Use ETA9741 power circuit
• Replace single-channel AND gate circuit
• Automatic charge-discharge switching
• Battery switch MOS control
• Physical battery switch position
• MCU main control board
• Key alignment
• PCB shape

S68K3 2024.8.19 (failed; power)

• RGB input signal interruption (replace 470K resistor with 500Ω and add 3.3v-5v boost circuit) √
• Battery charging anomaly (seems fine, recheck; prone to failure?)
• Charging circuit capacitor optimization
• Charging indicator light arrangement optimization √
• Replace charging interface with a surface mount √
• Reduce component variety
• USB to TTL chip √
• USB Type-C pin GND reversed (Done, to be checked) √
• Consider moving USB Type-C upwards

S68K2 2024.7.31 (failed; power, led)

• RGB LED pin assignment error (replaced backing in the next design)
• Power supply short circuit (replaced battery chip in the next design)

TODO:

• Add Prototype Picture
• Migrate to MicroPython

Reference

• circuitpython-ch9329: https://github.com/74th/circuitpython-ch9329
• HelloWord-Keyboard: https://github.com/peng-zhihui/HelloWord-Keyboard
• nRF52840-2.4GKeyboard: https://github.com/BrianLChen/nRF52840-2.4GKeyboard