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The existing communication technologies for IOT have become either saturated or do not meet actual needs, regarding long distances or low power consumption. We propose a study about mobility for the LoRa protocol, a new Low Power Wide Area Network technology. The paper draws upon a short overview of LoRa physical layer protocol, as well as on our testing design, some distances achieved and signal...
Powering a device using solar generated energy can be difficult, especially when that device is meant to function constantly over a long period of time. In this article we present an architecture for energy harvesting wireless sensor networks that can be used to develop solar powered applications. It will cover the hardware as well as the software requirements and specifications for a truly autonomous...
Wireless sensor nodes which harvest energy from the environment have become an alternative to battery powered nodes. Requirements for efficient use of the extracted energy led to development of algorithms that manage the node functions depending on the amount of collected energy. This article introduces a novel solution of adaptively setting the duty-cycle of a wireless sensor node in order to maximize...
Wireless sensor networks are a cheap and versatile solution for monitoring various environments. There are a number of such applications used worldwide to monitor areas in which human access is hard or near impossible. These applications are mainly used by government organizations or for research purposes, while standardized or commercial applications are still under development. They seldom focus...
With the worldwide urban population following a continuous growth, more individuals expose themselves to a less healthy environment by inhaling polluted urban air. The current pollution measurement techniques make use of automated monitoring stations that are usually installed in certain key points around the city but can only provide coarse-grained air quality reports as well as not being able to...
Battery powered wireless sensor nodes (WSN) are rarely efficient from the point of view of life time, development and maintenance cost. In this context, energy harvesting techniques are used more and more, coupled with super capacitors, in order to mitigate the costs and increase the lifetime. This paper presents the results of powering Sparrow v3, a wireless sensor node, from super capacitors charged...
Wireless sensor networks are a cheap and versatile solution for monitoring various environments. The data gathered by these sensors is often used in research projects and science experiments. It is necessary to ensure that a certain level of security and protection is instated for the transmitted data. Current software security methods implemented on wireless sensor networks do not necessarily take...
The degree of pollution in the atmosphere is increasing, leading to more and more people being affected by breathing health issues. However, people are increasingly aware of the need to monitor their environment. We propose a platform that leverages a Wearable Sensor Device and Mobile Devices to collect large amounts of air quality data on a central Real-Time Data Processing System that can process...
This paper describes the design of energy-efficient wide spectrum mechanisms and protocols to capture context information and employ actuation to close the feedback loop. The project described in this article focuses on harvesting energy from the environment through as many ways as possible, and efficiently using the harvested energy in off-grid buildings, dynamically adapting the consumption to currently...
Wireless Sensor Networks (WSNs) is a technology which is increasingly implemented in a multitude of data acquisition, data processing, and control applications. A rectifier antenna, or rectenna is a device used to convert radio frequency energy into electrical energy through the use of a rectifier circuit attached directly to a regular antenna. For most purposes, rectennas are used for microwave energy...
Wireless Sensor Networks (WSNs) is a technology which is increasingly implemented in a multitude of data acquisition, data processing, and control applications. Node localization in such networks is one of the topics which is currently intensely researched. The solution proposed in this paper is based on measuring the radio waves propagation from the emitter to the receiver. A new approach will be...
The Internet of Things and Ubiquitous Computing are becoming more and more popular in the IT world. There are increasingly more heterogeneous systems of interconnected devices, from general purpose smartphones to highly specialized embedded devices. An important constraint of mobile devices is the limited battery capacity. Users will stop using devices that have to be recharged frequently and that...
Wireless sensor and actuator networks (WS&ANs) are a new technology based on networks of small radio-enabled embedded devices that are being deployed in areas such as environmental monitoring, vehicle tracking, building management, body monitoring and other applications. Power sources for network nodes are often limited, which imposes restrictions on hardware resources and their use by the underlying...
In this paper we present a mobile system for air quality and pollution measurement suited for the urban environment. We designed, tested and built a reliable measurement device that can acquire information about the air quality of its surroundings, store it in a temporary memory buffer and periodically relay it to a central on-line repository. Real-time gathered data can be freely accessed by the...
This paper discusses a scheduling algorithm for the sub-tasks of an application in a Wireless Sensor Network. With the next generation of sensor networks, task-based systems are needed to provide services to entities outside the network. Allocation of tasks on different wireless nodes must take into account energy constraints, compatibility of tasks to a given node or topology and must be in agreement...
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