Keypad Controller PCB
Advanced 20-button matrix scanning with ESP32 and integrated power management.
The Keypad Controller PCB is a robust circuit board designed for precision 4x5 button matrix scanning via the ESP32 DevKit platform. It features an integrated LiPo charging circuit with USB-C connectivity, making it an ideal core for wireless industrial interfaces or high-end DIY controllers.
The design prioritizes stability and protection, including a TP4056 charging IC, TVS overvoltage diodes, and a PTC resettable fuse. A boost converter ensures a rock-steady 3.3V supply across the entire battery discharge cycle. The 20 Omron tactile switches are arranged for optimal feedback and durability.
With its shape-optimized layout and professional component selection, this PCB is a ready-to-deploy solution for wireless IoT keypads and custom embedded HMI systems.
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