In the hot download of the "Green Lighting Technology Special Issue" in May, how can you miss it! With the rapid development of the economy and society, electric energy is getting more and more tense, and the phenomenon of wasted energy still exists. In many colleges and universities, there is a problem that classroom lighting management is not in place. At night, the empty classrooms are still brightly lit. For such large buildings, lighting energy saving is becoming more and more important. The widely used lighting energy-saving switches are basically voice-activated, contact-type, etc. Due to the limitations of use, these switches can only be used as an auxiliary part of the control system. To realize the intelligent and energy-saving indoor lighting system, the most important point is that the system can detect and judge the presence of human beings. The passive pyroelectric infrared sensor on the market is limited to detecting dynamic human body and people who are sitting in the classroom. Do not react. The project team designed a low-cost, low-power indoor intelligent control system based on the active pyroelectric infrared sensor. 2. Overall system function and structure 2.1 Features Pyroelectric infrared technology is used to detect whether there is any person in the room. When someone enters the room, the sensor detects the infrared rays emitted by the human body and generates a current signal. The signal is processed by the integrated processing circuit IC and transmitted to the single-chip microcomputer. The single-chip microcomputer controls the illumination through the control relay. The switch of the device, after which the single-chip computer controls the motor to rotate the sensor at intervals. If there is always a human body in the room, the lighting device remains energized. After the person leaves, the sensor closes the load due to the detection of the human body in the next detection cycle. It can achieve the effect of "people to light, people in the light, people off the light, safe and energy saving". The intensity of the indoor light is detected by a photoresistor. Using the illumination characteristics of the photoresistor, the current generated by the photoresistor changes with a change in relative light intensity at a certain voltage, and these electrical signals are sent to the single-chip microcomputer, and the switch of the lighting appliance is automatically controlled by the single-chip microcomputer. In terms of model power consumption, the sensor is up to 5W in the case of rotation and up to 0.5W in the static case. If the sensor is properly arranged in the classroom, energy-saving control of the lighting device can be realized. 2.2 structure block diagram The design consists of an active pyroelectric infrared sensor detection module, a single-chip control module, an ambient light intensity detection module, and a relay execution module. The structure is shown in Figure 1. Figure 1 block diagram What is 5G CPE? Wireless Cpe,4G Cat6 Cpe,4G Mifi,4G Ufi Shenzhen MovingComm Technology Co., Ltd. , https://www.szmovingcomm.com
1 Introduction 
Definition of 5G CPE
CPE stands for Customer Premise Equipment. The so-called front end refers to the equipment in front of the customer's terminal equipment. When we use Wi-Fi, if the distance is far, or there are more rooms, it is easy to appear signal blind spots, resulting in mobile phones or ipads or computers can not receive Wi-Fi signals. The CPE can relay the Wi-Fi signal twice to extend the coverage of Wi-Fi.
What are the benefits of CPE?
Through the following comparison table, it is not difficult to understand the technical advantages of CPE products:
* Currently, the global 5G FWA service is mainly in the Sub-6GHz band, with only the United States and Italy supporting the millimeter wave band.
* 5G CPE integrates the low cost of Wi-Fi and the large bandwidth of 5G, combining the advantages of the two to form a strong complement to traditional fiber broadband.
The relationship between 5G, FWA and CPE
It can be said that FWA (Fixed Wireless Access) will be the most down-to-earth application of 5G technology. FWA business plays a key role in enabling "connecting the unconnected." FWA is a low-cost, easy-to-deploy flexible broadband solution. Compared with wired access technology, FWA has been an ideal choice for deploying broadband in many countries and regions because it does not need to obtain rights of way, dig trenches and bury cables, and drill holes through walls. The development of 5G technology is further promoting the development of FWA.
FWA services (including 4G and 5G) have reached 100 million users. FWA is no longer a niche service; The FWA industry as a whole has been supported by numerous suppliers. Why is that? In the 5G era, 5G CPE receives 5G signals from operator base stations and then converts them into Wi-Fi signals or wired signals to allow more local devices to get online. For operators, the initial user penetration rate of 5G is low, and the investment is difficult to realize quickly; The CPE business can use the idle network to increase revenue for operators, so major operators vigorously promote the development of 5G CPE.
FWA services can be used for both home (To C) and business (To B), and customers have different requirements for CPE devices when using FWA services in different application environments, resulting in consumer grade 5G CPE and industrial grade 5G CPE (similar to home routers and industrial routers).
In 2020, the global market size of 5G CPE will reach 3 million units, and it is expected that in the next five years, the market size of 5G CPE will maintain a compound growth rate of more than 100%, reaching 120 million units in 2025, with a market value of 60 billion yuan. As an important market for 5G CPE, China's 5G CPE market size will reach 1.5 million units in 2020 and is expected to reach 80 million units in 2025, with a market value of 27 billion yuan.
The difference between 5G CPE and other devices
CPE can support a large number of mobile terminals that access the Internet at the same time, and the device can be directly inserted with a SIM card to receive mobile signals. CPE can be widely used in rural areas, cities, hospitals, units, factories, communities and other wireless network access, can save the cost of laying wired networks.
A Router is a hardware device that connects two or more networks, acts as a gateway between networks, and is the main node device of the Internet. Routers use routes to determine the forwarding of data. If it is a home router, it does not support a SIM card slot, and can only receive signals by connecting to optical fiber or cable and then convert it into WI-FI to provide a certain number (several) of terminal devices to surf the Internet.
Industrial 5G CPE is equivalent to 5G industrial routers, and the technology of the two is not very different. On the one hand, the industrial 5G CPE converts 5G network signals into WiFi signals for transmission, and on the other hand, the data received by the WiFi network is converted into 5G network signals for uploading. In addition, industrial 5G CPE generally supports routing functions.
5G CPE trends
According to a research report, after evaluating the products of some mainstream 5G CPE suppliers, many institutions believe that the development of 5G CPE products will continue in two aspects: one is to support mmWave and Sub-6 GHz at the same time; Second, the design will pay attention to humanized operation and installation. The industry development trend will accelerate the demand for 5G in the medical, education and manufacturing industries due to the epidemic, and 5G FWA will promote global 5G CPE shipments.