Touch touch emulation capacitive?

Question

Do it yourself

Good afternoon, I'm racking my brains on the subject of "emulation" of touching a capacitive sensor. How do you think, how can you connect directly to the sensor - make him think that the capacitance in the circuit has changed? Suspend a capacitor at 100nF, followed by an INPUT FLOAT leg, which should be quickly transferred to the input state with a pull-up to ground for a short time?

Answer 1

100 nF is a lot, 10-20 pF is enough. If the sensor is too far from your device, there will be false positives due to cable capacitance. In this case, the capacitor must be connected through a field-effect transistor, which should be placed as close as possible to the sensor.