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This paper aims at presenting an experimented low power Internet of Things architecture, that could be integrated to underwater monitoring systems like Autonomous Underwater Vehicles for wireless underwater sensing. The proposed hardware architecture of the sensor nodes is based on an ultra-low-power Flash Micro-controller that takes measurements from water sensors, and synchronizes the network by...
A novel two stage wakeup unit is proposed for Semi-passive temperature logger tag based on ISO 18000-6c Rev1 air interface protocol for RFID tags. This wakeup unit assists the tag to realize a temperature log1 function, a high sensitivity and low standby current level. It has been designed and fabricated in SMIC 0.18um process as part of the whole tag. Measurement results show that the tag can reduce...
The detector is mainly composed of CC430F5137, Lithium battery, Voltage monitor chip, temperature sensor, CO sensor and smoke detector, etc,. The detector is improved via the design optimization of hardware and software, which greatly reduces power consumption. Contemporarily, the detector uses BP algorithm program for judging whether there is a fire in the detect area. BP algorithm program is embedded...
In the last years the number of papers related to wireless sensor networks has increased substantially. Most of them focus in raising issues as routing algorithms, network lifetime, and more recently, Multiple Input Multiple Output wireless networks. In contrast with all those studies, we present a practical application of wireless networks: The sensing of the pH and temperature for a fish farm. The...
This paper reports the design and implementation of a system based on a wireless sensor network for measuring the temperature and pH in a tannery barrel. The prototype consists of a base node and two battery-powered remote sensor nodes. These sensor nodes are responsible for performing the measurements and transmit them via multi-hop radio links to a PC-connected base station. The system includes...
Wireless sensor networks are being considered for use in industrial process and control environments. Unlike traditional deployment scenarios for sensor networks, in which energy preservation is the main design principle, industrial environments stress worker safety and uninterrupted production. To fulfill these requirements, sensor networks must be able to provide performance guarantees for radio...
In this paper, we present a design approach and implementation result of home control devices for standby power reduction. The proposed mechanism uses the IEEE 802.15.4 based ZigBee protocol between Host and Agent for communication and security. Experimental results demonstrate that in the proposed mechanism, standby power consumption by Agent (consumer device) can be reduced by 200 mW.
This paper presents a distributed fermat-point range estimation strategy, which is important in the moving sensor localization applications. The fermat-point is defined as a point which minimizes the sum of distances from three sensors inside a triangle. This point is indeed at the trianglepsilas center of gravity. We solve the problems of large errors and poor performance in the bounding box algorithm...
Sink mobility has become an increasingly important requirement of various sensor network applications. Handling such mobile sink conditions brings new challenges to large-scale sensor networking. This investigation proposed a hybrid-structure routing protocol (HSRP) that combines the benefits of grid-based and cluster-based structures. Grid-based structure is designed to solve the cluster head selection...
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