Blood pressure is an important index which reflects human body and blood pressure monitoring plays an important role in clinical and medical care.Aiming at shortcomings of measurement precision is not high and stability is bad of traditional MCU design scheme

a high precision blood pressure meter is designed based on pressure sensor by means of effective combination of MSP430 MCU and ARM processor.Start from pulse wave feature points

using an improved threshold method can accurately detect valid pulse wave peak values in many pathological conditions

it overcomes shortcoming of not high accuracy of traditional threshold method in detecting pulse wave

and is simple and has short measuring time.Self-adaptive Kalman f

iltering algorithm is used to fit enveloping line which is better than Gaussian curve fitting and easy to implement programming.Test results show that the system error is lower than 4 mmHg and measurement range is 0

295 mmHg

and has advantages of high precision and fast speed.