Has anyone had success with capacitive touch?

[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




 

[TimB]

I see that there is a basic tutorial from 2017 and seems to be written in proton 

http://nerdclub-uk.blogspot.com/2017/01/capacitive-sensing-using-pic.html

[trastikata]

I see that there is a basic tutorial ....

You may take a look here, the real Touch tutorial 

https://www.microchip.com/stellent/groups/sitecomm_sg/documents/devicedoc/en542979.pdf

https://www.microchip.com/stellent/groups/SiteComm_sg/documents/DeviceDoc/en542719.pdf