The sensing layer is used to solve the problem of data acquisition in the human and physical world, which is composed of various sensors and sensor gateways. This layer is considered to be the core layer of the Internet of things, which is mainly the intelligent collection of goods identification and information. It consists of two parts: the basic sensing devices (such as RFID tags and readers, various sensors, QR codes, GPS, cameras and Readers) and the network composed of sensors (such as RFID network, sensor network, etc.). The core technologies of this layer include radio frequency technology, emerging sensor technology, wireless network networking technology, field bus control technology (FCS), etc. the core products involved include sensors, electronic tags, sensor nodes, wireless routers, wireless gateways, etc.<br>
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