18-07-2012, 04:31 PM
Heart rate measurement
Heart Rate Measurement(main).ppt (Size: 1.94 MB / Downloads: 54)
WORKING PRINCIPLE
It follows a technique to measure the heart rate by sensing the change in blood volume in human cardiovascular system in a finger artery while the heart is pumping the blood.
It uses LED that transmits a signal through the fingertip reflected by the blood cells.
HEART RATE SENSOR
Heart beat sensor is designed to give digital output of heart beat when a finger is placed on it. When the heart beat detector is working, the beat LED is unison with each heart beat.
This digital out put can be connected to microcontroller directly to measure Beats Per Minute(BPM) rate.
It works on the principle of light modulation by blood flowing through finger at each pulse.
LCD
The LCD’s comes in many shapes and sizes but most common is the 16 character x 12 line display with no backlight.
Its requires only 11 connections- eight bits for data and three control lines.
Its runs off a 5V DC supply and only needs about 1mA of current
APPLICATIONS
In Medical Professional
Business Application
Sports
Personal Application
LIMITATIONS
It is non water resistive.
Finger Should be placed Properly if not the sensor will not work.
It works on the principle of light modulation by blood flowing through finger at each pulse so the exact heart rate cant be measured.