A wireless self-powered piezoelectric breathing monitor system enabled by buckled n-shape and L-shape structure

Breathing monitoring is important in the health and sports area. In this paper, a wireless self-powered system for breathing designed using piezoelectric devices buckled n-shape L-shape structure. A cotton belt used to tie chest deliver force stimulated by cavity enlargement caused breathing, which can be collected measured based on three-dimension Three hard lead zirconate titanate (PZT) patches are as energy source support sensing circuit soft polyvinylidene fluoride (PVDF) works sensor measure stretching force, placed at gap between 3D-printed structure, making measurement more precise. signal comparison commercially battery-powered respiration belts shows efficiency of accuracy, precision, recall factors. The also practical experiments it found that intense actions have similar peak-peak value wavefront but much higher frequency respiration. This design training, potential data acquisition disease diagnosis applications.