说明：  此设计以单片机STC89C51为核心，由声音传感器采集脉搏信号，经过LM324前置放大电路、滤波电路和比较电路后得到与脉搏相关的脉冲信号，将该脉冲信号作为定时/计数器T1中断信号交由单片机进行脉冲周期的计算，T0做定时器。然后得出每分钟的脉搏搏动次数(即心率)，并将结果1602LCD上显示心率。在对人体脉搏检测时，具有检错排错的功能。若出现误操作（如不小心移动时产生的噪声）造成检测到的心跳次数不正确的结果，所以在程序中检测时间到达第5秒时，先对其进行计算，若结果超出正常范围则自动返回重新检测，直至结果正确，再继续检测5秒，最终由单片机计算出结果。在测量数据超过正常范围(如大于120次／min或小于45次／min)时自动重新开始检测。
(Single-chip STC89C51 this design as the core, by the sound pulse sensor signal acquisition, the LM324 preamp circuit, filter circuit and compare the circuit to be associated with the pulse of the pulse signal, the pulse signal as the timer/counter interrupt signal cross-T1 single-chip pulse by calculating the cycle, T0 timer so.And then concludes that the pulse per minute pulse frequency (ie heart rate), and the results show 1602LCD heart rate. Pulse detected in the human body when debugging with the function of error. If misoperation (such as careless move noise) to detect the heartbeat caused by an incorrect number of results, so in the process of testing the time taken to reach the first five seconds, the first of its calculation,If the results exceed the normal range will automatically return to re-testing until the results of the right to continue testing for 5 seconds, the final results calculated by the single chip. In the measurement data over the normal range (for example, m)