Solar Energy Harvesting to Improve Capabilities of Wearable Devices

dc.affiliation.dptoUC3M. Departamento de Ingeniería Térmica y de Fluidoses
dc.affiliation.grupoinvUC3M. Grupo de Investigación: Ingeniería de Sistemas Energéticoses
dc.contributor.authorPáez Montoro, Alba
dc.contributor.authorGarcía Valderas, Mario
dc.contributor.authorOlías Ruiz, Emilio
dc.contributor.authorLópez Ongil, Celia
dc.contributor.funderComunidad de Madrides
dc.contributor.funderMinisterio de Ciencia e Innovación (España)es
dc.contributor.funderUniversidad Carlos III de Madrides
dc.description.abstractThe market of wearable devices has been growing over the past decades. Smart wearables are usually part of IoT (Internet of things) systems and include many functionalities such as physiological sensors, processing units and wireless communications, that are useful in fields like healthcare, activity tracking and sports, among others. The number of functions that wearables have are increasing all the time. This result in an increase in power consumption and more frequent recharges of the battery. A good option to solve this problem is using energy harvesting so that the energy available in the environment is used as a backup power source. In this paper, an energy harvesting system for solar energy with a flexible battery, a semi-flexible solar harvester module and a BLE (Bluetooth® Low Energy) microprocessor module is presented as a proof-of-concept for the future integration of solar energy harvesting in a real wearable smart device. The designed device was tested under different circumstances to estimate the increase in battery lifetime during common daily routines. For this purpose, a procedure for testing energy harvesting solutions, based on solar energy, in wearable devices has been proposed. The main result obtained is that the device could permanently work if the solar cells received a significant amount of direct sunlight for 6 h every day. Moreover, in real-life scenarios, the device was able to generate a minimum and a maximum power of 27.8 mW and 159.1 mW, respectively. For the wearable system selected, Bindi, the dynamic tests emulating daily routines has provided increases in the state of charge from 19% (winter cloudy days, 4 solar cells) to 53% (spring sunny days, 2 solar cells). Keywords: energy harvesting; internet of things; physiologicalen
dc.description.sponsorshipThis research was funded by the Department of Research and Innovation of Madrid Regional Authority, in the EMPATIA-CM research project (reference Y2018/TCS-5046). This work has been partially supported by the European Union—NextGenerationEU, with the SAPIENTIAE4BINDI project “Proof of Concept” 2021. (Ref: PDC2021-121071-I00/AEI/10.13039/501100011033). This work has been supported by the Madrid Government (Comunidad de Madrid-Spain) under the Multiannual Agreement with UC3M in the line of Excellence of University Professors (EPUC3M26), and in the context of the V PRICIT (Regional Programme of Research and Technological Innovation).en
dc.identifier.bibliographicCitationPáez-Montoro, A., García-Valderas, M., Olías-Ruíz, E., & López-Ongil, C. (2022). Solar Energy Harvesting to Improve Capabilities of Wearable Devices. In Sensors, 22, (10). 3950-3971en
dc.publisherMDPI AGen
dc.relation.projectIDComunidad de Madrid. Y2018/TCS-5046es
dc.relation.projectIDComunidad de Madrid. EPUC3M26es
dc.rights© 2022 by the authors. Licensee MDPI, Basel, Switzerland.en
dc.rightsAtribución 3.0 España*
dc.rights.accessRightsopen accessen
dc.subject.otherEnergy harvestingen
dc.subject.otherInternet of thingsen
dc.subject.otherPhysiological sensorsen
dc.subject.otherSolar energyen
dc.subject.otherWireless communicationen
dc.subject.otherWireless sensor networken
dc.titleSolar Energy Harvesting to Improve Capabilities of Wearable Devicesen
dc.typeresearch article*
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