| Περίληψη: | The development and usage of wearable devices has become quite common in the past few years, as their cost has been greatly reduced. Most of them measure vital signs, such as Heart Rate (HR) and acceleration. HR can be computed via sensors that contain red, infrared, and / or green Light Emitting Diodes (LED). Each of those LEDs have different properties and capabilities as their respecting wavelength can reach in varying distances within the human skin. The acceleration is measured by an accelerometer. There is also a microcontroller inside those devices and potentially an output terminal, such as a screen to display the outputs. The specific device that has been used in this diploma thesis is aspired to have a medical purpose and to be used in hospitals to assist with triage. The main purpose of this diploma thesis is the implementation of parallel processing, which means that HR, the blood oxygen saturation level (SpO2) and acceleration are computed exactly at the same time (with a millisecond accuracy). Furthermore, SpO2 is calculated using the Red and the InfraRed (IR) LED, only if there is lack of movement. The HR measurements are taken using an IR LED when the person is standing still. In case there is movement, the green LED is used to measure the HR and there is no SpO2 measurement.
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