人脉搏跳动的时候，血液的透光性不一样会导致接收器那边接收的信号强弱不一样，因此可以把变化的信号滤波、放大、整形等系列处理后 ，单片机利用外部中断对其进行计数，最终换算成人一分钟脉搏的跳动次数显示在液晶屏上。(When people beat the light transmittance of the blood is not the same there will lead to receiver the received signal strength is not the same, so we can take the signal filtering, amplification, shaping a series of changes after the treatment, using MCU external interrupt to count the number of beats, the final conversion of adult a minute pulse displayed on the LCD screen.)