Hybrid Approach for Energy-Aware Synchronization in Sensor Networks

This book chapter discusses a time synchronization scheme for wireless sensor networks that aims to save sensor battery power while maintaining network connectivity for as long as possible

Progettazione e sviluppo di un sistema cromoterapico mediante una rete di sensori wireless

The work of this thesis consists in the development and implementation of a chromotherapy system based on a WSN. The system is independent from the environment in which is installed and is very flexible. The nodes of the system interact with each other to synchronize themselves and to disseminate the color sequence to display. The system is also able to recognize if topology changes occur and is also able to reconfigure itself accordingly without affecting the nodes synchronization. SOMMARIO Questo lavoro di tesi è consistito nello sviluppo e nella relativa implementazione di un sistema cromoterapico basato su di una rete di sensori wireless. Il sistema è indipendente dall’ambiente nel quale viene installato risultando perciò molto flessibile nell’utilizzo. Ogni nodo della WSN interagisce con gli altri cercando di creare una rete sincronizzata e permettendo la diffusione e la visualizzazione di una sequenza di colori atraverso un device RGB esterno Il sistema può inoltre riconoscere se un cambiamento topologico sta avvenendo nella rete ed è in grado di riconfigurarsi di conseguenza senza influire sulla sincronizzazione dei nod

The Smart Stone Network: Design and Protocols

The Smart Stone Protocol (SSP) has been developed to achieve rapid synchronization in a wireless sensor network, establish Time Division Multiple Access (TDMA)communication slots, and perform distributed sensing with global shared awareness. The SSP achieves a synchronization precision of 50μs among receivers. The sender is synchronized to the receivers using a novel scheme to identify the closest comparable times on the sender and receiver. The protocol is tightly related to events that occur in the mote hardware, and is designed to operate on resource constrained wireless sensor motes. Robust TDMA communication slots are set up based on the achieved synchronization, and an innovative algorithm is employed to maintain synchronization without sending any additional synchronization bytes. To test and validate the protocol, Smart Stones have been custom designed using commercial off-the-shelf (COTS) components, and the SSP has been successfully demonstrated on the Smart Stone Network performing an acoustic sensing application