System and method for monitoring respiration

A system for monitoring physiological data of a user, comprising:

• a housing configured to be secured to an inner surface of a garment and positioned between the garment and a body of the user when the garment is worn by the user, wherein the housing comprises a first opening;
• and
• an electronic circuitry positioned in the housing, the electronic circuitry comprising:
• an optical sensor configured to output an optical sensor signal indicative of one or more cardiovascular parameters of the user;
• a set of stacked capacitive layers, a first pair of the set of stacked capacitive layers forming a respiration sensor and a second pair of the set of stacked capacitive layers forming a proximity sensor, the first pair of capacitive layers of the respiration sensor being arranged between the second pair of capacitive layers of the proximity sensor, wherein the set of stacked capacitive layers includes a second opening aligned with the first opening and the optical sensor, and wherein the respiration sensor is configured to output a respiration signal indicative of respiration of the user and the proximity sensor is configured to output a proximity signal indicative of the housing being positioned proximal to the user;
• and
• a processor configured to receive the optical sensor signal, the respiration signal, and the proximity signal, determine physiological data based on the optical sensor signal and the respiration signal, and control the electronic circuitry based on the proximity signal.