The present disclosure relates to a
proximity sensor circuit and related sensing methods. Various embodiments include devices and methods using a
proximity sensor. Example devices include: a
transducer circuit having a sensor circuit that includes electrodes; an electrical
signal sensing circuit; a substrate that supports and at least partially encloses the
transducer circuit and the electrical
signal sensing circuit; and a communication circuit. The
transducer circuit converts a change in
capacitance, which is carried by the electrodes and responsive to pressure and / or
electric field modulation caused by a hemodynamic or
pulse wave event, into an electrical
signal. The electrical signal sensing circuit senses an event in response to the electrical signal from the transducer circuit. The substrate may mate with a portion of a user and position the sensor circuit close enough to the user's
skin to inductively sense a hemodynamic or
pulse wave event. The communication circuit responds to the electrical signal sensing circuit by transmitting data indicative of hemodynamic monitoring.