Node Architecture
The wireless sensor nodes are the central element in a wireless sensor network (WSN). It stores and executes the communication protocols and the data-processing algorithms. The quality, size, and frequency of the sensed data that can be extracted from the network are influenced by the physical resources available to the node. Therefore, the design and implementation of a wireless sensor node is a critical step.
The node consists of sensing, processing, communication, and power subsystems. The designer has a plethora of options in deciding how to build and put together these subsystems into a unified, programmable node. Sensor node is shown in the figure 1.
The sensing subsystem integrates one or more physical sensors and provides one or more analog-to-digital converters as well as the multiplexing mechanism to share them.
Nowadays, there are a plethora of sensors that measure and quantify physical attributes at a cheap price. A physical sensor contains a transducer, a device that converts one form of energy into another form of energy, typically into an electrical energy (voltage). The output of this transducer is an analog signal having a continuous magnitude as a function of time. Therefore, an analog-to-digital converter is required to interface a sensing subsystem with a digital processor.
المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .
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