project report, impact of wireless sensors based system for home energy
written to serve as a reference book for wireless LAN in the future whenever it
is desired. This report explains the survey consideration, hardware
consideration, end-user consideration and principle of wireless network.
sensor networks (WSNs), as distributed networks of sensors with the ability to
sense, process and communicate, have been increasingly used in various fields
including engineering, health and environment, to intelligently monitor remote
locations at low cost. Sensors (nodes) in such networks are responsible for
four major tasks: data aggregation, sending and receiving data, and in-network
data processing. This implies that they must effectively utilize their
resources, including memory usage, CPU power and, more importantly, energy, to
increase their lifetime and productivity. Besides harvesting energy, increasing
the lifetime of sensors in the network by decreasing their energy consumption
has become one of the main challenges of using WSNs in practical applications.
In response to this challenge, over the last few years there have been
increasing efforts to minimize energy consumption via new algorithms and
techniques in different layers of the WSN, including the hardware layer (i.e.,
sensing, processing, transmission), network layer (i.e., protocols, routing)
and application layer; most of these efforts have focused on specific and
separate components of energy dissipation in WSNs. Due to the high integration
of these components within a WSN, and therefore their interplay, each component
cannot be treated independently without regard for other components; in another
words, optimizing the energy consumption of one component, e.g. MAC protocols,
may increase the energy requirements of other components, such as routing.
Therefore, minimizing energy in one component may not guarantee optimization of
the overall energy usage of the network.