INTERNATIONAL JOURNAL FOR TRENDS IN ENGINEERING & TECHNOLOGY VOLUME 1 ISSUE 1 – OCTOBER 2014 - ISSN: 2349 - 9303 IJTET©2014 Embedded Based Wireless ECG System Hariesh A 1 1 Anna University, Department of ECE, harieshanbalagan@gmail.com Dinesh Kumar R 2 2 Anna University, Department of ECE, rdineshraj94@gmail.com Abstract— The aim of the paper is to design an embedded based wireless ECG system using IEEE 802.11G. With the emerging application of embedded systems in all the fields, the use of microcontrollers can be applicable to the field of medical sciences. In the conventional ECG system, the system is complex due to the higher number of wires from patient’s body to the monitoring section. And one more disadvantage is that a cardiac specialist cannot monitor all emergency ward patients ECG. At a time, he can monitor only one patient in the hospital. In this paper, we present a design by which the specialist can monitor all patient’s ECG sitting in his room using IEEE 802.11G as main communication between devices and also designed a EMI filter to remove power line interference on ECG signals. Index Terms— Cardiac specialist, ECG, EMI filter, IEEE 802.11G, Microcontroller, Medical science, power line interference. ——————————  —————————— 1 INTRODUCTION OBILE telemedicine systems are becoming more important all the time, especially in the care of patients that are isolated or traveling, far from a reference hospital. These systems must be embedded in low cost, small devices with low power consumption, and should have an interface that is usable by the patient. Incorporating technologies such as Bluetooth, GPRS, GSM or IEEE 802.11G (Wi-Fi) to these systems allows the wireless transmission to health or control centers. This paper describes a low cost, portable system with wireless transmission capabilities for the acquisition, processing, storing and visualization in real time of the electrical activity of the heart to a PC. In our paper, we have used embedded systems to acquire the signal from patient using two paste electrodes and amplify the signal using an instrumentation amplifier. The amplified signal is filtered using an RC network. Then it digitized using PIC microcontroller and given as serial port input as PC. In today’s modern world, as everything goes wireless, in our paper ECG also goes wireless. The digitized ECG signal is transmitted using IEEE 802.11G. The transmitted signal is received and viewed in MATLAB. The wireless networking is controlled by NETBEANS which is a java application IDE. In MATLAB, it is filtered from power line interference by designing an EMI filter. 2 GENERAL BLOCK DIAGRAM 2.1 Transmitter The Transmitter block consists of electrodes, signal conditioning, filter, and controller and IEEE 802.11G system. 2.2 Receiver The receiver consists of IEEE 802.11G interfaced to computer by the software Netbeans which has MATLAB. 3 EXPLANATION OF THE BLOCK DIAGRAM 3.1 Sensors In our ECG we use two paste electrodes which are meant for acquiring ECG signals. By convention, the positive electrode lead on the left arm (LA), and the negative electrode lead on the right arm (RA), and therefore measure the potential difference between the two arms. 3.2 Signal Conditioning This module consists of a high pass filter to eliminate very low frequency noise. This is also used to remove the phase shift problem occurring in the acquisition of ECG signal. The ECG signal which is of very low amplitude has to be amplified as well as filtered from the noise signal. The signal conditioning circuit should consist of the two stages an amplifier using AD620 and a high pass filter of 0.05 Hz critical frequency. M Fig. 1. Block diagram of transmitter Fig. 2. Block diagram of receiver