For popular science
Recently proposed to implementation in the MCU!

CodePudding user response:

I don't know
But in theory, a touch will result in changes of capacitance, capacitance change will affect the frequency signal change
If you make an IO output intensity of a weak periodic signal, while reading the I/o signals, if read like a signal and the given signal shows no touch, if read signals relative to the output signal has the very big change, explain a touch
Can understand, so no touch when no capacitance, you charge soon, IO at once high output is high, if there is a touching, you output high is the actual status will only be a moment

CodePudding user response:

Thank you for your reply,
If so, that is, to design a calculation delay time of hardware logic, if time is short, don't touch, if have change, is to have touch,
Whether to use the software, scanning on a regular basis can also?

CodePudding user response:

General capacitance method, let the two closer to a pieces of metal transfer frequency signal, when the hand close to pass part are absorbed by the hand,
Test the transformation, the specific circuit a lot, there are simple