关键词: Cortex-M0, MCU, 血氧饱和度, 脉率

Abstract: According to the measurement principle of blood oxygen saturation by infrared spectroscopy, a portable pulse oximeter with finger clip is designed with ARM (advanced RISC machine) Cortex-M0 core MCU as a development platform. The design adopts a self-developed microprocessor based on the ARM core, which effectively reduces product costs. The hardware makes full use of the internal modules of the single-chip microcomputer, and the controllable switch circuit is designed to minimize the power consumption; the software is designed to collect pulse wave signals and perform digital demodulation, noise elimination, feature point extraction and other functions. A comparison experiment with Jiangsu Yuyue Medical Equipment Co., Ltd. Model YX301 oximeter (hereinafter referred to as the fish oximeter) shows that the measurement error of blood oxygen saturation and pulse rate of the prototype designed in the static state is within 2%, and the product stability is verified.

Key words: Cortex-M0, MCU, bloodoxygensaturation, pulserate