[z_zetetic_z]

If you want something you can actually buy, check out the wooting he

https://next.wooting.io/wooting-60he

You can set per key actuation points, and bind multiple different inputs to the same key but different depths, etc.

Great review here

https://m.youtube.com/watch?v=glQNEbh79xg

You can even mod it into another case for the DIY crowd.

[cttet]

I used it for a midi keyboard and it was fun

[billconan]

Can it detect speed or force? I googled, and it seems to be a binary sensor.

[z_zetetic_z]

I believe it measures distance, so possibly speed as well, and force could be computed with knowledge of spring resistance. However, I don't think I saw anything in their material relating to these two terms.

[dimatura]

Cool, I've dabbled in this with ordinary mechanical switches. What's the hardware interface like for the Wooting switches?

[z_zetetic_z]

I believe it's custom, because the mechanical part is actually just part of a sensor (it's just a magnet in a slider). The other part is the hall effect sensor which is soldered on the board. So, you can't drop these mechanical parts on to another board, they aren't self contained switches.