Design Of Pulse Measuring Instrument Based On SCM

The pulse signal contains a large number of health information of the human body,and the pulse can reflect the comprehensive information of the human body,and can accurately and efficiently feedback a large number of physiological blood flow characteristics of the cardiovascular system.At this stage,the electronic pulse measuring instrument on the market has a simple function and only provides measurement functions.At the same time,most of the pulse signals are obtained by piezoelectric sensors.Such instruments have poor precision and often have significant measurement errors.In this context,people set stricter standards for pulse measurement instruments based on measurement accuracy and function.The system design includes STC89C52,LCD1602 display,photoelectric sensor,GSM and WiFi module,buttons and other parts.Firstly,the infrared photoelectric sensor sends a pulse signal,then amplifies and shapes,and finally transmits to the single-chip microcomputer to realize the control,which can measure the pulse beat in 1min.The number of times not only saves time and effort,but also results are more accurate.The system supports the user to detect the pulse rate at any time,and can also set the upper/lower limit times according to the actual situation.If the detection range exceeds the preset range,the driver buzzer gives a warning,and the pulse signal is directly input into the LCD1602 to facilitate people to view and understand.When the preset value is exceeded,the GSM module is called to give a short message prompt.The measuring instrument can be easily set up by a computer to realize information storage,and the operation difficulty is very low.Considering the actual situation,the following work is required:First,clarify the functions required by the system and do a demand analysis for each function.Second,most of the human biological signals are low-frequency weak signals in a strong noise environment,and the pulse wave signals are low-frequency weak nonelectrophysiological signals.In order to meet the acquisition conditions,amplification and poststage filtering should be performed.Third,integrate all hardware devices and filter and amplify the shaping circuit to convert the human body pulse signal into an electrical signal.Use C language to program,establish screen display,alarm and other functions.After repeated comparison tests,the calculation error is 0.59,which roughly conforms to the accuracy standard.While ensuring the basic pulse measurement function,the SMS alarm monitoring and remote control functions are established,making the pulse measuring instrument more perfect and powerful.