It can become a multi-level switch to enable or disable features, or a volume knob with virtual end stops. It can be set to friction-less spinning mode, which is useful for quickly scrolling through long documents. Based on a brushless DC motor, this knob can be configured in various ways to perform several different tasks. Next to the big E-ink screen is a tiny OLED display that works in tandem with a haptic feedback knob. The bottom part of this module has an E-ink display that can show a variety of useful information: current memory usage, email notifications or simply the weather forecast. That is brilliant, but what makes this project really interesting is an extension module on the left side of the keyboard that turns it into what calls a “smart keyboard”. The shift registers are driven by a 4 MHz SPI clock, which means that a full scan of all keys takes just 40 microseconds. This enables the main ARM controller to read out every key separately, eliminating ghosting and allowing any number of keys to be pressed simultaneously. This went all the way down to the readout circuitry: rather than wiring the switches in a matrix, as most keyboards do, he used a set of shift registers. Instead, he decided to do everything himself in order to obtain maximum performance and configurability. When he started on the design of the main key area, could have used any of the open-source keyboard frameworks. At first glance it might look like just another custom keyboard with mechanical switches, but when you look inside you’ll find it full of clever design tricks and neat features. What started out as a simple lockdown project turned into what imagines to be the ultimate keyboard for his daily tasks. is the latest to impress us with an excellent custom keyboard that packs several unusual features (video in Chinese, with English subtitles, embedded below). While most people may think that a keyboard is just a board with keys, those who read Hackaday will no doubt know that there’s an infinite variety of beautiful designs to suit any use case.
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