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Based on the usage of capacitors, condensators. Alternatively, utilizing the derivative of signals.

40 votes

How can human finger pressure be measured?

A capacitive sensor may also work, but detecting variation in pressure in a consistent way is trickier. …
Mark Leavitt's user avatar
  • 5,969
2 votes

How can I use a microcontroller to trigger an existing capacitive-touch pad?

If not, then the problem may be interference rather than capacitive loading.) Configure the IO pin as an input and be sure to disable any pullup or pulldown as well. …
Mark Leavitt's user avatar
  • 5,969