Each node of the wireless sensing network is equipped with a radio transceiver, a small microcontroller and one Energy (usually battery). The size of a single sensor node is large to an space shuttle, which is small to one dust. The cost of the sensor node is also uncertain, from a few hundred dollars to a few cents, depending on the size of the sensor network and the complexity required for a single sensor node. The sensor node size and complexity limit determine the limit of energy, storage, calculation speed and bandwidth.
In the field of computer science, the wireless sensing network is a research hotspot, which will hold a lot of seminars and international conferences every year.
Wireless sensing network mainly includes three aspects: induction, communication, calculation (hardware, software, algorithm). The key technologies are mainly wireless database technologies, such as using queries in wireless sensor networks, and network technologies for communicating with other sensors, especially multiple jumping routing protocols. For example, Motorola uses the ZigBee wireless protocol in the home control system.
Wireless sensing network has many different applications. In the industry and the business community, it is used to monitor data, and if the wired sensor is used, the cost is high and difficult. Wireless sensors can be placed in a ridiculous area for a long time, which is used to monitor environment variables without having to recharge them and then go back.
Application of wireless sensing network includes video surveillance, traffic monitoring, aviation traffic control, robotics, automobile, home health monitoring, and industrial automation. A typical application in environmental monitoring is the sensing network (Sensor Web, or SW). Recently, the sensor network is used to monitor effective use of electricity.
Smart dust ( smartdust ) is a new engineering concept, the purpose is to have intelligent The wireless sensor is reduced as the size of the same sand or dust, and the detection such as temperature, vibration, and the like. Each smart dust can be a node in a wireless sensor network to collect information, processing information, and connect with other node.
Computer Network (English: Computer Network ), usually also referred to as a network, is a use of communication devices and lines Connecting a wide range of computer systems, a functionally independent multiple computer systems, implements the network's hardware, software and resource sharing, and information transfer systems with complete network software. Simply put on the system that connects two or more computers to communicate.
sensor (English: Sensor) is used to detect events or changes in the environment, and send this message to other electrons Devices (such as central processors) are typically composed of sensitive components and conversion components.
The sensor is a physical device or biological organ, which can detect, feel the external signal, physical conditions (such as light, heat, humidity) or chemical composition (such as smoke), and transmitted the information Other devices. "Sensor" is defined in the new Weite big dictionary as: "From a system acceptance power, it is usually sent to devices in the second system in another form." According to this definition, the sensor's role is to convert an energy into another energy form, so many scholars are also called "sensor-Sensor" with "transducer -Transducer".