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Has anyone had success with capacitive touch?

Started by TimB, May 25, 2023, 06:12 PM

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TimB


Hi

I have a design that has 4 physical buttons. As the buttons are on the bottom PCB they need a stand off to reach the top where the user finger will be. As I have a LCD that needs a cut out there is not a lot of the enclosure top left after the cut out required. Even though the actual display area is small.

I have seen that these enclosures have an area on the top for a PCB. Then it dawned on me that I could use a PCB and it would solve a few issues. The PCB could have a cut out for the LCD aperture and provide support for the overlay.
The pcb could also have the appropriate pads for 4 touch buttons. The overlay would need no bulges to make it work with the button movement.

However I have never been successful with a capacitive button. Well only tried a couple of times years back and gave up.

I have a pic doing all the graphics stuff and a lot of pins free and CPU time. So it should be possible

The pic is a Pic18f27Q10

Thanks


enclosure.png

Enclosure with PCB.png 

TimB