What are the information sensing technologies of the Internet of Things?

Including QR code tags and readers, RFID tags and readers, cameras, GPS, sensors, M2M terminals, sensor gateways, etc. The perception layer consists of basic sensing devices (such as RFID tags and readers). It consists of two parts: basic identification and sensing devices such as writers, various sensors, cameras, GPS, QR code tags and readers) and a network of sensors (such as RFID networks, sensor networks, etc.). The core technologies of this layer include radio frequency technology, emerging sensing technology, wireless network networking technology, fieldbus control technology (FCS), etc. The core products involved include sensors, electronic tags, sensor nodes, wireless routers, wireless gateways, etc. Some common key technologies in the perception layer are as follows:

1. Sensor: The sensor is the main device for obtaining information in the Internet of Things. It uses various mechanisms to convert the measured into electrical signals, and then the corresponding signal processing device Processed and generated response actions. Common sensors include temperature, humidity, pressure, photoelectric sensors, etc. ?

2 RFID: The full name of RFID is Radio Frequency Identification, which is radio frequency identification, also known as electronic tag. RFID is a non-contact automatic identification technology that can identify specific targets and read and write related data through radio signals. It is mainly used to establish a unique identity for each item in the Internet of Things. ?

3 Sensor network: A sensor network is a network composed of sensor nodes, where each sensor node has a sensor, a microprocessor, and a communication unit. The nodes form a sensor network through a communication network and work together to sense and collect accurate information about the environment or objects. Wireless Sensor Network (WSN) is currently developing rapidly and is the most widely used sensor network. For the RFID network that currently attracts more attention and applications, the RFID tags attached to the equipment and the scanners and sensors used to identify RFID information belong to the perception layer of the Internet of Things. The information detected in this type of Internet of Things is the content of RFID tags. Current electronic (non-stop), toll collection systems (Electronic Toll Collection, ETC), supermarket warehouse management systems, airport luggage automatic classification systems, etc. all belong to Internet of Things applications of this type of structure.

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