A sensing device that may include sensing elements that elements comprise a first sensing element, a second sensing element； wherein each sensing element comprises one or more piezoresistive materials； and a sensing circuit that is coupled to the sensing elements, wherein the sensing circuit is configured to sense a resistance of the first sensing element and of the second sensing element, and to determine, based on the resistance of the first sensing element and of the second sensing element, a first parameter of a cardiac waveform of a living being, wherein the cardiac waveform (a) is sensed by the first sensing element, and (ii) is not sensed by the second sensing element.
