And, since its pin compatible with most Arduino shields, you can add even more capabilities to the Touch Board for more complex projects. For example, pop on a relay switch shield, like the one ...

Below you can see one such touch sensitive mirror light switch module that I purchased for a quick analysis ... of the PCB. Next is a partial schematic of the module I made to show how the LED driver ...

This PLL-based circuit implements a touch-switch circuit using the PC board or small metal pads as sensors; it is radiometric and thus insensitive to changes in temperature and supply voltage.