TTP223 1-key capacitive touch module

[mcauser]

I was going to write a driver for the $0.20c little red TTP223 touch module, but it's pretty much just a drop in replacement for a push button. No driver needed.

So I put together some examples:
https://github.com/mcauser/micropython-ttp223

There is a little red LED under the touch pad that lights up when a touch is detected.
Reasonably accurate and can detect a touch through paper, cardboard and plastic, so you can mount them inside protective cases.

[shaoziyang]

You may try TTP229, 16 touch key sensor.