Throughout this paper, we emphasize design; photoplethysmograph hardware design. We propose to build
and test a photoplethysmograph. This device will be used to determine heart rate using a volume
measurement. This is done by using low levels of infrared sensors to detect small changes in blood content
in the micro-circulation of the skin that occur with each heart beat . An LED is used to transmit light into
the skin. The infrared is reflected by the iron content of the blood in the skin and tissues. The transmitted
light through the blood and tissue is detected by a receiver. This information is processed and amplified to
provide blood flow data. The photoplethysmograph gives a good technique to the physician to get the
suitable diagnosis to his patient according to the output data that he gets from this device.
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