A New Approach of the Ecg Logger Design Using Microcontroller

There is a need to remotely monitor fully mobile heart patients in their natural environments. The Monitoring of a patient’s ECG waveforms in different conditions can track the diagnosis of a heart disease, which can further be treated to help prolong and improve the life of the patient. If a patient must be monitored without any delay that is associated with delivering data which is stored on a recording device, biotelemetry is necessary. Biotelemetry consists of measuring the biological waveforms to a remote area for recording and processing. Due to the limitations of the currently popular methods of biotelemetry, this paper proposes the use of the microcontroller based hand held ECG logger. It consist of the Isolated circuit that is comprising of an ECG preamplifier and protection circuit with two channels of ECG data, a right-leg drive, low and high pass filters, a gain stage, A/D converter, and the Isolation circuit for the signal lines. This extremely low powered device is designed to consume less than 5mA of power in full operation and Powered by a lithium polymer battery. The device will be very small in size, handy and thickness will also be very less. The topic of this paper is to design the Isolated circuitry of an ECG recorder, and an Wireless link (Transmitter and Receiver) for use in a portable ECG device for cardiac investigation.