kelvinAMedia
Inspiration and/or examples of working principle
I found this video which shows how the slider would ideally perform, just that you can press down on it and it can be set to allow movement "infinitely" in either direction.
Tetrinsic is the merge of the above motorized sliding potentiometer and the SmartKnob View:
The visible area is designed to be as minimalist as possible, so that things like an LCD backlight can be used for designs:
The cool thing about Tetrinsic is that you don't have to remove a magnetic top layer (as seen in Flux) or hotswap out the switches (on a more traditional keyboard) if you want to change tactility. Just tune it to your precise tastes in software.
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Preface
Finding out about hall effect switches and their potential double-action feature, I started researching double-action switches.
Small tactile switches (0.6N, 1.6N) do exist, but from pressing my camera's shutter button, their second actuation force is too high for all but the thumb. I discovered Riskable's Void switches and how the design could allow for adjustable actuation force without the need for an electrical connection to the keyboard PCB. Magnets seemed to be quite cheaper than buying 0.8N and 0.5N tactile switches, and allows for LED backlighting because the components needed are smaller.
On Sep 14 2022, I changed the design to center around a mini BLDC motor connected to a 2GT belt that also acts as the keycap surface. This was inspired by various open source projects (namely the SmartKnob View) and uses the motor and force sensors to simulate different sliders and tactility, as well as make the weight and amount of actuation points software adjustable.
The motor is also used to reduce the learning curve as much as practically possible, as my main question I thought of when learning to touch-type was "Where is the key? What finger do I use to press it?"