A wireless sensor network consists of spatially distributed autonomous sensors to monitor physical or environmental conditions, such as temperature, sound, vibration, pressure, motion or pollutants and to cooperatively pass their data through the network to a main location. The development of wireless sensor networks was motivated by military applications like battlefield surveillance; today such networks are being used in many industrial and consumer applications. This includes industrial process monitoring and control, machine health monitoring and so on. The wireless sensor network is build of nodes, from several hundreds to even thousands where each node is connected to one sensor.
Each such sensor network node has typically several parts; a radio transceiver with an internal antenna or connection to an external antenna, a microcontroller, an electronic circuit for interfacing with the sensors and an energy source in the form of a battery or an embedded from of energy harvesting. A sensor node might vary in size from that of a shoebox down to the size of a grain. The mote function within the network and typically full-fill one of the two purposes. Either data-logging, processing sensor information from the environment or acting as a gateway in the adhoc wireless network formed by all the sensors to pass data back to a collection point.
The IEEE 802.15.4 protocol has been adopted as a communication standard for the low data rate, low power consumption and low cost Wireless Sensor Networks. This protocol is quite flexible for a wide range of applications if appropriate tuning of its parameters is carried out. Most of the mote platforms use this standard for communication between the motes. TelosB mote is IEEE 802.15.4 compliant and use 2405 to 2480 Mhz band for communication. TelosB mote boards are typically powered from an external battery pack containing two AA batteries.
Advanticsys has been in this field since 2009 and is quite the solution provider. They in fact specialize at Wireless Sensor Networks.
About Author:- Johanna Williams
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