Developing A Portable ECG Monitor Based On STM32 And Android

With the improvement of modern production and living standard, as well as the aging population of our country more and more serious, people are increasingly concerned about their Physical health. And electrocardiogram as the observation of the important indices for human body health more and more be taken seriously.The tWith the improvement of modern production and living standard, as well as the aging population of our country more and more serious, people are increasingly concerned about their Physical health. And electrocardiogram as the observation of the important indices for human body health more and more be taken seriously.The traditional bulky electrocardiograph severely limit the scope of the patients and affect patients’ physical and mental health.Therefore that developing a portable, low cost, large radius of ECG monitoring system has a both use value and research significance. The system structure of traditional electrocardiograph is divided into two parts in this design.One part is the signal acqusition module, other part is the signal processing module and display module.They via bluetooth for information communication and data transmission.Signal display and processing unit use the android mobile phone that everyone take along as a platform.Using android mobile phone as the ecg display platform can reduce heart electrocardiograph cost, reduce the volume reduction, increase the speed of data processing and extensibility.Based on the above ideas , we can design a portable electrocardiograph.ECG signal belongs to the biomedical signal, which is very susceptible to noise and other factors.Based on the characteristics of the ECG signal, the ECG acquisition module uses the medical electrode as the collecting electrode.Precision instrumentation amplifier AD620 is selected as the main component of the main preamplifier circuit.The right leg driving circuit, high pass and low pass filter and 50Hz digital notch filter are designed to filter out the noise.The voltage rise circuit is designed in order that the main control chip collects signal.Low cost, low power consumption STM32F103RBT6 is used as the main control chip of the acquisition module.Selection of 5V AMS1117 , 3.3V AMS1117 and a pair of ICL7660s constitute the power circuit.After stm32f103rbt6 12 bit ADC sampling, DMA transmission, digital filtering,the signal conditioning via Bluetooth to send data to the Android phones and according to data drawing mind map to detect the QRS wave, calculating the heart rate, to determine the status of heart rate, store the data of heart rate.After test of each module, the test results show that the design requirements are met.STM32 software design using keil4 as a development tool, using C language to program;Android design using eclipse as a development tool, using Java language to program.