how non-push buttons work.

Question

I can’t seem to understand the engineering behind non-push buttons. Take for example my coffee maker. I tap my finger on the top of it and it turns on, but theres no physical button, just the power symbol. I figured this would be more fun than asking google.

In: 5

Answer 1

Basically, your finger simulates a capacitor in the circuit, and that is detected, activating the function.