1,721,081 research outputs found
Integrating RFID Transponders as Data Loggers in Wireless Sensor Nodes for Outdoor Remote Monitoring Operations
No full textIn this paper the integration of an RFID system into a wireless sensor node based on an Arduino board is discussed. The main purpose of the proposed solution is to use the memory of a passive RFID transponder to store the data retrieved by the sensors composing the node. This solution can be employed for remote monitoring operations, when no connection is available and then no remote data collection is possible. The RFID transponder allows the storage of a large number of sensor data sets, that can be then acquired simply removing the transponder from the node and reading it with a common desktop reader. Once collected, the transponder is replaced with a new one allowing a new period of data collection regardless of human intervention. An ad-hoc data structure has been studied to optimize the memory usage and then to increase the life time of a single transponder. The solution is especially thought for outdoor monitoring operations: contactless data transfer allows the sensor node to be sealed and then to be totally protected from atmospheric agents
Low-cost power gating solution to increase energy efficiency optimising duty cycling in wireless sensor nodes with power-hungry sensors
Full text linkIn this study, a solution focusing on energy efficiency of wireless sensor nodes is presented. Energy dissipation is a key factor affecting the usability of wireless sensor networks (WSNs) in that, in worst cases, in systems without electric mains, the life of a sensor node battery may last even only a few hours. The proposed solution is characterised by very low costs thanks to the use of a small number of electronic components: it allows the optimisation of duty cycling (i.e. the ratio between activity and inactivity periods of sensor nodes) by power gating the node (i.e. turning the whole circuitry off). In particular, this solution is useful for applications that use active power-hungry sensors that are sampled regularly 10 to 1000 times a day. The described power control logic system is able to optimise the duty cycling, notably reducing the power consumption during idle periods, thus increasing the battery life at best up to 100–200 times: this means that the autonomous operation time of a WSN can increase from a few days to several months or even to some years according to the required sampling rate
Bringing near field communication under water: Short range data exchange in fresh and salt water
No full textNear Field Communication (NFC) is rapidly becoming one of the most common proximity communication technologies. The most part of last generation smartphones are provided with NFC connectivity and a wide number of applications are emerging in several different fields. While mobile payment and mobile ticketing applications have been widely tested and developed, no study exists concerning the use of NFC technology under water. While the most part of radio technologies is useless under water due to signal fading, NFC, operating at 13.56MHz, can be able to achieve a very short communication range, allowing contactless data transmission. In this paper the technical aspects of NFC operation under water are analyzed, the results of laboratory tests proving the functionality of the technological solution are presented and a set of possible use cases where NFC could be employed in underwater activities is suggested. In particular, the paper focuses on the possible use of NFC for an Underwater Smart Poster application
Ultra-Low Power Architecture for Offline and Online Inertial Measurements
No full textInertial Measurement Units (IMUs) have become important components in various IoT (Internet of Things) and wearable applications, providing continuous monitoring of motion and orientation. However, one of the most significant challenges in using IMUs in long-term deployments is the optimization of their power consumption. This paper presents an ultra-low-power architecture designed to optimize IMU power consumption for both offline and online inertial measurements. The proposed architecture combines techniques such as duty cycling and adaptive sensing with careful selection and integration of components, enabling continuous and punctual motion tracking. The focus is on developing a method for measuring the inertial dynamics in critical contexts over extended periods, while also facilitating position tracking and online data transmission when possible. Although tested in a laboratory environment, this set-up provides promising results for application fields requiring sustained observation despite intermittent movements
Museum and Near Field Communication – turning a mobile phone into an interactive tourist guide
No full textThe PITAGORA project: near field communication to improve passenger experience in airports
No full textThis paper describes a solution based on Near Field Communication technology to improve Passenger Experience, i.e. the fruition of services and assets, in airports. This system has been developed within the PITAGORA project, a research program co-financed by the Regional Government of Tuscany, Italy, focusing on the development of an innovative integrated platform for airport management. The proposed solution is based on the use of NFC for different purposes, starting from a virtual Boarding Pass service where the user's smartphone can be used to replace the common paper Boarding Passes. Together with this application, a set of complementary services has been developed to facilitate the use of the airport premises by the passengers. These services include an NFC Localization function allowing the user to know his/her position inside the airport structure, and an NFC Information function, providing the user custom data concerning retails, services and transports
A Novel Methodology to Remotely and Early Diagnose Sleep Bruxism by Leveraging on Audio Signals and Embedded Machine Learning
No full textMonitoring Workers Safety in Restricted Working Areas: A Case-Study with LoRaWAN Technology
No full textProject and Realization of a Wide-Range High-Frequency RFID Gate Allowing Omnidirectional Detection of Transponders
Full text linkThe paper describes the study and development of a 2-meter-wide HF RFID gate providing omnidirectional detection of transponders.Common commercial HF RFID gate structures provide a maximum reading range around 150 cm.Moreover, this value is in most cases guaranteed only for the maximum coupling direction, with lower values for the other 2 orientations. The proposed structure raises the value of the reading range up to 200 cm for every orientation of the transponder, with even better results (220 cm) when the transponder is in the position of maximum coupling. This result has been achieved through numerical simulations, focused on the study of the geometry of the antenna system and on the realization of the matching circuit and then confirmed with the
physical implementation of the system
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