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Designed in this paper , the production of a pulse detector based on USB interface , the detector consists of hardware and software , the hardware circuit includes a data acquisition circuit , amplifying and filtering circuit , control circuit and power circuit . Data acquisition photoelectric pulse sensor ; amplifier circuit using the AD620 ; filter circuit by the second-order active low-pass filter ; selected with USB controller , ADC, internal clock source control circuit , a standard CIP51 kernel the microcontroller C8051F320 ; whole system firmware programming , USB device driver design, design of data collection procedures and software filtering process design , firmware, host drivers and software filtering process by the C language , data collection procedures by The VB6.0 languages ??. With a good instrument hardware , software , testing the resulting pulse waveform to accurately reflect the true characteristics of the human pulse . The instrument also has to use , easy to carry , Field tests show that : the system has achieved its intended design requirements .
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