Developing a Smart IOT Device for Heart Rate and Blood Oxygen Measurement using a smartphone

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Remote monitoring of physiological parameters such as heart rate and blood oxygen saturation (SpO₂) has become an important approach for improving healthcare accessibility and continuous patient observation. This research paper peruses the development of a smart Internet of Things (IoT) that considers a cell phone for the function of heart rate, blood oxygen and temperature monitoring. This study presents the design and implementation of an IoT-based healthcare monitoring system using a MAX30100 sensor, NodeMCU ESP8266, and smartphone application for real-time measurement and transmission of vital signs. On the other hand, the trend of mobile health monitoring by smartphones is widely becoming popular, but there is no full-fledged solution at this point which would integrate IoT technology for allowing for real-time vital sign tracking. The performance of the developed system was experimentally assessed by collecting real-time heart rate and SpO₂ measurements from individuals representing different age categories. The recorded physiological parameters were transferred using an IoT communication platform and presented through a mobile application interface to support remote and continuous monitoring. The device provides communication via the IoT connection to transfer and transmit the registered data to the cloud server for further processing and storage purposes. Practical implementation of this adaptive IoT device also leads us to demonstrate the accuracy and reliability. The results confirm the feasibility of the proposed IoT system as a low-cost and portable solution for real-time monitoring of heart rate and blood oxygen saturation. The experimental results demonstrated stable measurements of heart rate and SpO₂ within the normal physiological range for the tested participants. The developed system showed comparable performance with a commercial pulse oximeter, with a maximum difference of approximately 10 beats per minute in heart rate measurement.