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

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