Indumentaria electrónica orientada al monitoreo del ritmo cardíaco en deportistas basado e Energy Harvesting.

Abstract

This project shows the design and implementation of an electronic textile for continuous heart rate monitoring based on energy harvesting, divided into a sweater that incorporates the heart rate sensor along with the flexible solar panel for energy collection and a removable module that allows the display and sending of data. For the continuous measurement of beats per minute (bpm), the MAX30102 sensor was used, which uses the photoplethysmography method to detect the heart's pulsations based on the light reflected from the blood circulating in the blood vessels. These measurements are displayed on an oled display, located in the removable module on the chest, allowing easy viewing of data by the athlete. For data processing, the Arduino Lilypad USB microcontroller is used whose supply voltage can vary between 3.3 V and 5.5 V, for power supply to the microcontroller a flexible solar panel was used, which has a maximum output voltage of 7.9 V, this voltage is rectified by the MP1584EN reducer module whose output was adjusted so that when the solar panel delivers the maximum voltage of 7.9 V the module delivers a maximum of 5.35 V. To keep track of the data, they are sent to a database in Firebase, for which a SIM800L module using GSM/GPRS wireless technology was used. The sending of alerts for exceeding the maximum heart rate threshold is done by push notifications to the mobile device through the application developed for Android, which also allows access to the data log and to consult the connection and battery status of the clothing. Finally, bpm measurements are 98%, which is within the ANSI/AAMI EC13 standard, which establishes a percentage of up to ± 10% or ± 5bpm error. The solar panel allows up to 6 hours of energy autonomy for the electronic clothing on a sunny day and 5 hours on a cloudy day.