Wi-Fi based Integrated System for the Monitoring of Heart Rate and Peripheral Capillary Oxygen Saturation

This work illustrates an integrated system comprising a low-cost Embedded device connected with a finger-type Photoplethysmography (PPG) array sensor to estimate Heart Beats per minute (HR) and Peripheral Capillary Oxygen Saturation (SpO2) parameters and a web based application that receives them via Wi-Fi for further processing and visualization through Message Queuing Telemetry Transport (MQTT) internet protocol. In conventional PPG signal sensing approaches, the finger-type PPG sensor probe is being utilized while Wireless Personal Area Network (WPAN) technology, mainly Bluetooth Low Energy (BLE), is used to transmit the data to a gateway acting as an intermediate. The low-cost Embedded and microcontroller-based device that processes the signals collected by the finger-type Photoplethysmography (PPG) array sensor, extracts both HR and SpO2 parameters, and ultimately transmits them via Wi-Fi to a web-based application. The web-based application, which is a dedicated tool in the hands of the physicians, features an interface that allows both continuous monitoring and recording of patients corresponding parameters.