A Design Of Heart Rate Measurement Whitch Suitable For Smart Wear

In this paper, we study a according to the principle of photoelectric displacement method, the photoelectric pulse sensor is used to design a heart rate measurement module, the heart rate measurement module can be static and dynamic measurement of heart rate, volume is small enough, at the same time the module is able to convenient integration in most is smart apparel products, such as intelligence, intelligent bracelet watches.The system design is based on the analog front end AFE4403 heart rate module. System of stmicroelectronics company chip is used in the main control chip STM32F205REY6, transmitter using two separate green light LED, received using a photodiode, receiving tube in the middle of the two leds, the reason for this is photodiode receives a strong enough light evenly. Analog front-end AFE4403 by controlling the emission of LED light, light into the subcutaneous tissue, subcutaneous arterial blood and other tissues absorb part of the light, some are not absorbed light is reflected and photoelectric diode according to cause arteries to relax the beating of the heart and contraction, the inside of the artery blood's influence on the amount of reflected light, to determine the person's heart rate. BMA223 joined an acceleration sensor in the system, used to detect human action, is mainly used for the dynamic measurement, filtering the interference caused by the action, to achieve more accurate dynamic measurement of heart rate. Finally will measure good heart rate value through UART send out.