Design And Implementation Of Lowpower Wireless ECG Monitoring System

Since cardiovascular diseases are considered threats to the number one killer of human health,effective diagnosis and prediction of it has become a major issue in today’s world needs to solve urgently.Clinical results have been confirmed,in strenuous exercise appear directly causes sudden death comes in large part from cardiovascular disease.In 2013,the Taiwan Army soldiers died in military training.In the military or sports training,real-time monitoring of the ECG waveform of personnel training,with immense clinical significance to prevent sudden cardiac death.However,in the process of obtaining the ECG waveform,noise into the inevitable,accuracy of ECG abnormalities later calculation.In view of the above problems,this paper will study the content is divided into two parts:ECG waveform of trained personnel and the low power wireless transmission of real-time ECG waveform.Firstly,according to the experience of design of preamplifier,compensation circuit,high pass filter,low pass filter,50Hz interference filter,as well as the main amplifier circuit and adder circuit.ECG signal after collecting device is input to the amplifier,after the signals are amplified,then through a filter circuit for filtering,signal filtering frequencies below 0.05Hz and above 105Hz frequency,while preventing interference signal by 50Hz.Required by the filtered signal is clean,the post amplifier amplify it to volt level,after the adder circuit the waveform is improved to above 0 volts,to single chip analog to digital conversion circuit directly into digital values.The design of data acquisition circuit system analysis as follows:signal amplification is necessary links,and the signal should be increased to A/D input range of requirements,that is at least as "V" level;should try to weaken the interference;should consider the question of baseline drift caused by breathing;signal frequency is not high,pass the band is usually meet the requirements,but should consider the input impedance,linear,low noise etc..Using AD8232 movement when extracting ECG waveform noise,amplification and filter biological weak signals.The design makes ultra low power analog to digital converter(ADC)or embedded micro controller can easily capture the output signal.AD8232 uses the means of double pole high pass filter to eliminate the motion artifacts and electrode half cell potential.The filter and the instrumentation amplifier structure tightly coupled,can realize single stage high gain and high pass filtering,which saves space and cost.The second part is mainly the use of low power chip and communication protocol for wireless transmission of ECG waveform,using ARM Cortex-MO to control the Bluetooth input computer;a master and a slave to slot physical channels in the most fully utilized after.ARM Cortex-MO is the area of the market the smallest,lowest power of ARM processor.