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In order to deal with the shortcomings of a photoelectric mode cardiotachometer, such as wasting energy and slowly refreshing results, this study mainly focuses on a real-time displayed, portable, low-cost, and energy-saving cardiotachometer. The design is based on the Mbed, which is the core microprocessor, controlled and dispatched by the built-in function. Before filtering and amplifying the electronic signal, the pulse signal is collected by the photoelectronic sensor at the beginning ofdoi:10.1049/joe.2018.9052 fatcat:qj5djbal6bfupi72rbv2hdotay