Custom Mechanical Keyboard PCB Design

Project Overview

A custom-designed PCB for mechanical keyboards featuring modern connectivity options and robust protection circuits. The project encompasses both hardware design and firmware implementation.

Key Features

• Hot-swap switch socket compatibility
• USB Type-C connectivity with ESD protection
• QMK firmware support for advanced key mapping
• RGB LED backlighting support
• Multi-layer PCB design with ground planes

Technical Implementation

Designed using KiCad EDA software, implementing USB Type-C with protection circuitry and proper impedance matching. The PCB features a 32-bit ARM microcontroller running custom-configured QMK firmware.

Challenges & Solutions

• Challenge: Signal integrity for high-speed USB
  Solution: Implemented controlled impedance routing and proper stackup
• Challenge: ESD protection implementation
  Solution: Added multi-stage protection with TVS diodes
• Challenge: QMK firmware customization
  Solution: Developed custom keymap and LED control features

Results & Impact

Successfully manufactured and assembled multiple functional keyboards. The design has been tested extensively and proven reliable in daily use, with all features working as intended.