[P] 2nd Concept

A project log for Tetent Timespy [gd0136]

A wearable PDA / smartwatch with a Tetent [gd0090] based input layout.

kelvinAkelvinA 08/13/2022 at 23:000 Comments

[P] = Parts / prints received

So I fixed up the Anycubic Linear Plus I haven't printed on  in years to get this. The image above is my hand in it's natural position. Can you see how standard watches would have their screens pointing away from a user's line of sight? The inside curve is comfortable on my wrist, and 25mm is plenty of length for the keys.
This is it next to the watch I'm replacing. Yeah it looks large compared to that, but the size is mainly dependent on ergonomics. I'm here trying to get 100wpm on a wearable, not 10. Another nice bonus feature of this design is that the screen is still facing my line of site when resting on a table, which would be very useful for use when not worn on the forearm. 

Required changes

The top image is the heights of the finger keys (from the front) currently, and the bottom is more or less what it actually needs to be. I reduced the drop of the centre button from 3.2mm to 2mm in this design, but even that is not enough and it's closer to 1mm or even level with the one on the right.
Unfortunately, the thumb button is both too close to the fingers and doesn't stick out far enough from my arm. I think I'm off by >12mm (half the key). There goes my 90x60mm run. Maybe this is an opportunity to include some stereo speakers, or maybe some kind of sliding mechanism can save this form factor.