Toggles, push buttons, sliders, rotary & rocker switches and their capacitive touch equivalents.
But how can you start designing capacitive touch switches? Get our free technical guide: From switches to touch controls here.
We'll draw and simulate three button designs: with 1, 2 and 4 mm clearance respectively. The PCB footprint stays the same in each case, but the
area the buttons take up changes.
In this case, the design guideline has a severe effect on the performance.
As far as the capacitance is concerned, all the designs could work, even the one with the 4 mm clearance that is outside the recommendations.
But, choosing the design with 1 mm clearance would limit us to a 1 mm cover glass, that would make the design too fragile and the design with the 4 mm clearance creates empty spaces, where touch will not be detected.
So, we select the design with 2 mm clearance as the basis for further optimization. You can read and get our free technical guide: From switches to touch controls here.