The development of a measuring instrument for vital lung capacity and human respiratory rate based on a fiber-optic sensor has a system consisting of a laser diode as a light source. optical fiber as a waveguide and OPT101 as a photodetector. Arduino UNO R3 is used as a data processor and the measurement results are displayed via LCD. The fiber optic sensor is used to measure the vita... https://fitnessgravesyardes.shop/product-category/limit-switch/