Who is this for?
This keypad controller is a good fit for anyone who needs a wireless, battery-powered control panel, for example for industrial machinery, a custom home-automation panel, or a DIY project with physical buttons. It's also a useful reference for companies looking for a ready-made, well thought-out design to build on, rather than developing a rechargeable button-matrix board from scratch themselves. Anyone curious how a simple keypad is turned into something wireless and rechargeable will find a concrete example here.
What makes it special?
What makes this design special is the combination of a large number of buttons, wireless operation, and carefully thought-out power management on one compact board. Twenty buttons are read reliably without needing a tangle of wiring, while the built-in battery charging over USB-C works just as simply as charging a phone. Because the power supply stays stable across the entire battery discharge cycle, the panel remains just as reliable at the end of a working day as at the start, making it easy to use as the basis for your own product.