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.
TTP223 1-key capacitive touch module
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Re: TTP223 1-key capacitive touch module
You may try TTP229, 16 touch key sensor.