Design Of ECG Acquisition And Wireless Transmission Circuit Based On Bluetooth

Heart disease is a serious threat to human life and health. If a person has an abnormal heart rate for a long time, he is likely to have a heart disease. Because heart disease has the characteristic of being suddenly, you may lose the life if don’t find it in time. Therefore, it is very important to carry out ECG monitoring in daily life, allowing patients to find their own condition in time and go to the hospital to do the exact diagnosis. The research content in this paper is that design three basic parts for household portable ECG monitor including ECG acquisition circuit, Bluetooth wireless data transmission circuit as well as the Lab VIEW programming section in order to provide a good hardware platform for home ECG monitoring.This paper firstly introduces the main features of ECG signal. According to the actual demand, the overall design of the ECG acquisition circuit and the selection of the components are made. Coming from ECG leads and medical electrode pieces,a weak signal can be amplified and filtered by amplifier and filter circuit of ECG that mainly composed by AD8232 chip, capacitors and resistors. Carrying on the analog digital conversion for the ECG signal after amplifying and filtering, STM32 SCM controls Bluetooth module sent ECG signal to personal computer by wireless way. Based on the above, the schematic of the whole hardware circuit will be designed and hardware circuit board will be made. Let hardware circuit carry out the national standard test, then improve the matter that can’t up to national standard.Finally, we filter the ECG signal again by the Lab VIEW software on personal computer, removing the baseline drift and 50Hz power-line interference,with the purpose of realizing the ECG signal display, storage and playback. Extracting wave peak feature of ECG signal and calculating heart rate, we judge whether the heart rate is abnormal and make the alarm by the common heart rate problem.