Another idea, which you may have already implemented:
Different builders will have different size and placement of the two touch pads,
and thus different capacitance when not being used.
Also, some may be trying insulating tape over the sensors and such.
I'd consider adding a caibration step.
Measure the transition time for each paddle when user is sitting on his hands.
Measure again when fingers are resting naturally on the pads.
Report an error if the difference is too small to give reliable results.
Calculate an optimal time in between the inactive and active transition times,
store that to eeprom.
I'm sure some capacitive sensors out there are continuously auto-calibrating,?
The trackpad on this chromebook certainly does, and I find it infuriating.?
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On Tue, Oct 3, 2017 at 05:15 pm, Allard PE1NWL wrote:
Thanks for this idea. I haven't considered that option.
When I have some time I'll try it out to see if it would work. If so it
could save us one I/O pin!
