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2011 International Conference on Intelligent Computation and Bio-Medical Instrumentation
A Portable Wireless ECG Monitor Based on MSP430FG439
Hongli Yang*, Jihong Chai
School of Electronic and Communication Engineering Shenzhen Polytechnic
Shenzhen, China
Abstract— Through researching the ECG wireless monitoring technology, this paper designs a portable wireless ECG monitor. This system is controlled by MSP430 single chip computer, which amplifies and filters the patientyuml;s ECG signals and sends data to central controller with ZigBee wireless transmission module. Central controller displays the ECG signals. It implements the real time acquisition and short distance transmission of ECG data. This system is very portable, low power, real time and intelligent. It can use in home healthcare, community healthcare
Wireless
RS232
Monitor terminal
and sport training.
Keywords- electrocardiograph (ECG); filte; monitor; wireless transmission; MSP430
- INTRODUCTION
Electrocardiograph (ECG) is one of the basic human physiology electrical signals. The ECG signal reflects the humanrsquo;s heart activities and therefore can be used to diagnose the heart state and its disease. Besides the hospital, the application of ECG monitor appears in the different fields. Home healthcare, community healthcare and sport training have the urgent and new requirements to use ECG monitor [1- 3]. How to wear by person conveniently, how to capture the ECGs quickly and easily, and how to send to central controller are new problems and missions the biomedical departments and engineering must meet and solve.
In recent years, with the fast development of computer and communication technology, the information technology has been widely applied in each aspect of society .Combination information technology and communication technology with medical device make it is possible to achieve a kind of remote wireless ECG monitor. This paper gives an example on a portable wireless ECG monitor, which designed on the microprocessor MSP430FG439 and based on the on-chip ZigBee wireless network.
- SYSTEM DESCRIPTION
The monitor system composes of two parts, monitor terminal and central controller, shown as Figure 1.
ECG monitor terminal is worn by the person. ECG signal can be picked through the electrode, and then amplified and filter by the analogue circuits. Main process unit is MSP430, which finishes analog signal to digital signal conversion, digital
Central controller
Figure 1. Wirless ECG monitor system
filter and calculates the heart rate [4]. At the same time,
MSP430 sends all the processed data to ZigBee wireless module, which transmits data through 2.4GHz channel.
Lastly central controller receives the ECG data and then displays or stores them. The central controller is constituted by the wireless receiver and central PC. They can receive health parameters and make unified database management and information display. ZigBee receiver network could receive one point or multi-points information [5]. Figure 1 shows a kind of point to point communication system.
- DESIGN OF MONITOR TERMINAL
The main function of monitor terminal is collection and procession of weak ECG signal, which begin from the electrode worn by the person with the device. The other hardware of monitor terminal composes of three main parts [6]: analog amplifier and filter, MCU MSP430 and wireless transmitter shown as Figure 2.
The process of these three units begins with the weak ECG signal collected on electrode. The pre-amplifier is made of CMOS instrumentation amplifier INA321. The gain is 5. There is a 50Hz filter following the pre-amplifier, which eliminate 50Hz interference effectively. The internal operational amplifier of MSP430FG439 conducts the majority ration of amplification. It has the gain of 100. The total gain is 500.The amplitude of ECG is high enough to implement AD convert ion. The data can be sent wirelessly to central controller after the 12-bit converter and digital filter. The digital filter which is carried out by software program eliminates the high frequency interference.
MSP430 FG439
Main amplifier
ECG
electrode
Pre- amplifier
50Hz
notch filter
978-0-7695-4623-0/11 $26.00 copy; 2011 IEEE DOI 10.1109/ICBMI.2011.38
Wireless module
Figure 2. ECG monitor terminal diagram
148
1 2 3 4 5 6
D
D
C5 4.7nF
R10 1M
LA
RA
R1 100K R2 100K
INA321 2
R6 6.8K
R7 6.8K
R9 10K
OA0
6
3
OA0 I0
OA0 O
OA0 I1
C2
C3
R5
R3 2M
R4
2M
1M
C
C
470nF
470nF
C4 940nF
R8 3.4K
C1 100nF
DAC1 1.5V
OA1 I0
OA1 O
OA1
B
B
A
A
Title
Size B
Date: File :
Num ber
Revision
18-Jul-2011
H:䆎᭛My Design1.ddb
Sheet of Drawn By :
4 7
5 1
1 2 3 4 5 6
Figure 3. Analog circuit of ECG monitor terminal
- Analog Circuit
The analog circuit is shown as Figure 3. There are 3 units in this circuit: front end pre-amplifier, double-T filter and main operation amplifier. [7] The pre-amplifier must has high input impendence, high common mode rejection ratio as w
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