How to increase sensitivity of Capacitive Touch Switch? I am working with Capacitive Touch Sense technology.In that I am using TTP224 Touch detector IC. I am getting good sensitivity when I am using Touch pad without putting any non electric material over it and able to switch ON/OFF connected led.But when I put any non electric material like Acrylic Sheet of 2mm thickness I am not able to get any signal through pad or not able to ON/OFF connected led.

So, How can I increase sensitivity of Touch pad?

I have bought TTP224 module from here.

And what can be the alternatives for TTP224???
Sometimes things just ****. In my case, where 0.5 mm more of gap make the TTP223 unable to work, because I designed such a small pad. My solution? Remove the paint in the PCB, put a lot of solder in to make the pad taller. Work like a charm.