The Internet of things is an information sensing device such as radio frequency identification (RFID), infrared sensor, global positioning system, laser scanner, etc., which connects any item to the Internet according to a contractual agreement, and exchanges information and Communication, a network that enables intelligent identification, location, tracking, monitoring, and management of items. The core and foundation of IoT technology is Internet technology, which is an extended and extended network based on the Internet.
The Internet connects people to all objects, and the Internet of Things connects people, people, things, things and things. Although the concept of the Internet of Things has taken shape more than a decade ago, there are still many technologies that need to be perfected to establish an ideal Internet of Things, such as security, addressing, standards, access methods, and bioengineering. Only through these technological advancements and the introduction of uniform norms can a fair and user-centric IoT be acquired.
From the perspective of technical architecture, the Internet of Things can be divided into three layers: the perception layer, the network layer, and the application layer.
The sensing layer is composed of various sensors, including temperature and humidity sensors, two-dimensional code tags, RFID tags and readers, cameras, gps and other sensing terminals. The perception layer is the source of the Internet of Things to identify objects and collect information.
The network layer is composed of various networks, including the Internet, a wide-area network, a network management system, and a cloud computing platform. It is the backbone of the entire Internet of Things and is responsible for transmitting and processing information acquired by the sensing layer.
The application layer is the interface between the Internet of Things and the user. It combines with industry requirements to realize the intelligent application of the Internet of Things.
Plastic Package Diode.Among the electronic components, a device having two electrodes allows only the current to flow in a single direction, and many uses apply its rectification function. The Varicap Diode is used as an electronic adjustable capacitor. Most of the diodes have a current directionality that we often call the "Rectifying" function. The most common function of a diode is to allow only current to pass in a single direction (referred to as forward bias) and block in the reverse direction (referred to as reverse bias). Therefore, the diode can be thought of as an electronic version of the check valve.
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