Date of Award

Spring 2001

Document Type

Thesis - Restricted

Degree Name

Master of Science (MS)

Department

Electrical and Computer Engineering

First Advisor

Jeutter, Dean C.

Second Advisor

Richie, Jim

Third Advisor

Brown, Bruce

Abstract

A wireless heart rate monitor has been designed, developed, and prototyped to assist lay people in the monitoring of their hearts. The described heart rate monitor system is designed with two main components: the Handheld device and T-shirt device. The Handheld device, consisting of an LCD, keypad, microprocessor, amplification and receiver circuitry, is the user interface for the user to monitor the heart rate. The T-shirt device is made up of an ECG amplifier, ECG detector, and power coupling circuitry. The T-shirt device is sewn into a regular T-shirt so that it does not prohibit the normal activities of the person wearing the device. The circuitry within the T-shirt has no local power source, such as a battery, which would otherwise need to be changed on a regular basis. The function of the T-shirt circuitry is to receive power from the Hand held, and transmit the heart rate back to the Handheld. The Handheld in turn transmits a 25V pp, 2MHz carrier frequency via a coil, to power the T-shirt device which enables the CMOS circuitry to work. When the T-shirt device is activated, the Hand held will monitor the voltage level across its coil. As the voltage level varies, the Handheld will interpret the fluctuations as heart rate data via backscattering. The Handheld then detects the carrier frequency to allow recovery of the data, in order for the microprocessor to count the heart rate accurately.

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