For a project I have been working on, I want to sense if the door handle is being touched. I planned to do this by using the Capacitive Sensing Library, with a wire going to the door handle. However, I realized that the door is also metal, which makes my values largely increase so it does not react …

Capacitive touch on metal door

Paul_B November 1, 2021, 11:09pm 3

What is the "121"?

What about the TTP223?