Biomedical signal acquisition for respiration monitoring by flexible analog wearable sensors

This paper presents the experimental part for discrete time signal acquisition in case of respiration rate monitoring using analog flexible sensor. The hardware part for physiological monitoring consists in ARDUINO shield and a flexible tubular sensor connected with electrodes. The analog signals are generated by resistance parameter vary through a tubular semiconductor when this is stretched. It is a known fact that in the respiration act, the diaphragm muscle increase and decrease in a rhythmic way the volume. This tubular semiconductor has been made of polyester and stainless steel threads. The electronic system is composed of Bluetooth device and can send data to a computer, smartphone or notebook, in order to be processed. Data accuracy depends on skin temperature, skin humidity, sensor parameters (tubular semiconductor structure and density, yarn composition and structure).