Design of automated oscillometric electronic sphygmomanometer based on MSP430F449

This paper presents an automated oscillometric electronic sphygmomanometer. It uses MSP430F449 single-chip microcomputer as the controller kernel. Firstly the tiny signal which is detected by MPS2107 pressure sensor is amplified by the dedicated chip INA128, then the amplified signal will be divided into cuff-pressure oscillation signal (AC) and cuff pressure signal (DC). Secondly AC and DC signals are filtered and conditioned by the OP amp LM324. Thirdly the filtered and amplified signal will be sampled by ADC module of MSP430F449. AC and DC voltage series will be got. By oscillometric method, systolic pressure and diastolic pressure can be calculated out and displayed in LCD. The serial communication and real-time clock are also included in the system. The automated electronic sphygmomanometer performs satisfactorily when compared with conventional auscultation method and has realized accurate measurement of blood pressure.