Skin-to-skin contact detection

A method comprising:

• at a device comprising sense circuitry and processing circuitry:
• sensing, via sense circuitry, a signal at a sense electrode configured to contact a first body part, in response to a drive signal applied by a drive electrode configured to contact a second body part, different from the first body part;
• and
• in accordance with a determination that one or more criteria are met, the one or more criteria including at least one criterion that involves a comparison with a frequency domain representation of the sensed signal, the one or more criteria including a first criterion that is met when an amplitude of the sensed signal exceeds an amplitude threshold and a second criterion that is met when the sensed signal has a non-distorted waveform, detecting contact between the first body part and the second body part;
• and
• in accordance with a determination that the one or more criteria are not met, detecting no contact between the first body part and the second body part.

A system comprising:

• sense circuitry coupled to a sense electrode, the sense circuitry configured to sense a signal at the sense electrode in response to a drive signal applied to a first finger of a hand, and the sense electrode configured to contact a second finger of the hand, different from the first finger;
• and
• processing circuitry configured to:
• in accordance with a determination that one or more criteria are met, the one or more criteria including a first criterion indicative of contact between the first finger and the second finger and a second criterion indicative of movement of the first finger along the second finger, detecting a movement gesture;
• and
• in accordance with a determination that the one or more criteria are not met, forgo detecting the movement gesture.