Aiming at the problem that domestic electronic sphygmomanometer can only measure adults or children

an electronic sphygmomanometer suitable for both children and adults is proposed. The instrument measures during pressurization

and select different measurement modes by pressing the button. When measuring different groups of people

it is only necessary to change the size of sleeves. In the hardware part

the STM32 F103 RCT6 micro controller unit（ MCU） is selected as the control core

and the pressure signal acquisition and processing circuit is designed. In the software part

the median filtering algorithm is used for software filtering. According to the definition of the peak point and the threshold method

the peak points of each single wave of the oscillation wave are extracted. The peak point is fitted by the Gaussian curve and diastolic pressure（ DSP） and systolic pressure（ SBP） are calculated according to the variable amplitude coefficient method.Experiments prove that the electronic sphygmomanometer has high measurement precision and good stability.