Hello,
I would like to make buttons that can detect a conductive object put on the overlay.
I was thinking about using the CY8CMBR3110 and self capacitance measurement but I don't know what configuration would be best as the object won't be connected to ground.
- Configuration 1 : Sensors with a fishbone pattern (Rx = capsense signal and Tx = ground) with hatched ground plane connected to Tx (but won't my parasitic capacitance be too high ?)
- Configuration 2 : Sensors with a fishbone pattern (Rx = capsense signal and Tx = ground) with hatched ground plane but clearance between Tx and ground plane
- Configuration 3 : Round sensors with hatched ground (normal button configuration if you want to detect touch event)
- Or something different ?
Also is it possible to use several buttons at the same time ?
Lastly, if we disabled the auto reset, how long the sensor can stay in the ON position ? Can we let an object on the sensor for several hours and the presence will still be recognized ?
Thanks in advance,
Have a nice day
