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 buttons pressed with the thumb. Next, I discovered riskable's Void switches and how the design could allow for adjustable actuation force and doesn't need 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.
Ever since I started #Tetent Timespy [gd0136], I came to the realisation that the current solution (5 seperate buttons per finger row) I was trying to obtain was still flawed. As of Sep 14 2022, I've changed the design to centre around a mini BLDC motor connected to a GT2 belt that also acts as the keycap surface. This was inspired by various open source projects (namely the SmartKnob View) and will use 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 train, as my main questions when learning to type was "Where is the key? What finger do I use to press it?"
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.