The application prospect of smart home wireless sensor network

Although the large-scale commercial application of wireless sensor networks will take some time due to technical and other constraints, in recent years, with the declining computational cost and the decreasing size of microprocessors, there are already a large number of wireless sensors. The network was put into use. The current application of wireless sensor networks mainly focuses on the following areas.

The application prospect of smart home wireless sensor network

(1) Environmental monitoring and protection. As people pay more and more attention to environmental issues and more and more environmental data needs to be collected, the emergence of wireless sensor networks facilitates the random access to research data and can also avoid traditional data collection methods. Invasive damage caused by the environment. Wireless sensor networks can also track migration of migratory birds and insects, study the effects of environmental changes on crops, and monitor the composition of the ocean, atmosphere, and soil. In addition, it can also be used in precision agriculture to monitor pests, soil pH, and fertilization conditions in crops.

The application prospect of smart home wireless sensor network

(2) Medical care. Wireless sensor networks can also be used in medical research and nursing. The use of wireless communications to network each sensor can efficiently deliver the necessary information to facilitate care and reduce the burden on caregivers.

(3) Military field. Wireless sensor networks are characterized by intensive and random distribution, which makes them very suitable for use in harsh battlefield environments, including reconnaissance of enemy situations, monitoring of military forces, equipment and supplies, and determination of biochemical attacks. The US Department of Defense’s Vision Research Bureau has invested tens of millions of dollars to help universities develop “smart dust” sensor technology.

(4) Other business and scientific fields. Wireless sensor networks can also be applied in other fields. For example, some dangerous industrial environments such as wells, nuclear power plants, etc., staff can use it to implement safety monitoring. In the traffic field as a powerful tool for vehicle monitoring, it can also be used in many areas such as industrial automation, flow production lines and so on.

The application prospect of smart home wireless sensor network

Wireless sensor network has a wide range of application prospects. It not only has great application value in traditional fields such as industry, agriculture, military, environment, and medical care, but also will manifest its superiority in many emerging fields such as home, health care, and transportation in the future. And other fields. We can boldly foresee that in the future wireless sensor networks will become ubiquitous and will fully integrate into people's lives. For example, the micro-sensor network may eventually connect home appliances, personal computers, and other daily necessities to the Internet to achieve long-distance tracking. The home uses a wireless sensor network for security control, power saving, and so on. In the future, wireless sensor networks will be a very large and pervasive network, and their applications will probably involve all areas of human daily life and social production activities.

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RJ45 port editing

1. Origin:



2. The name RJ stands for the registered jack and is the USOC (universal service ordering codes) code of bell system. USOC is a series of registered sockets and their wiring mode, which are developed by bell system to connect the user's equipment to the public network. FCC regulations control the application of this purpose. The FCC (Federal Communications Commission) issued a document on behalf of the U.S. government to specify RJ11.



3. RJ11 is the common name of the connector developed by Western Electric Co. Its shape is defined as a 6-pin connecting device. Originally called wexw, where x means "active", contact or needle. For example, we6w has all six contacts, numbered from 1 to 6. The we4w interface only uses four pins, the outermost two contacts (1 and 6) are not used, and we2w only uses the middle two pins. For RJ11, the information source is contradictory. It can be a 2 or 4-core 6-pin connector. What's more confusing is that RJ11 is not only used to represent the 6-pin connector, it also refers to the 4-pin version.



4. RJ45 and RJ11: different standards, different sizes



5. Due to the different sizes of the two (RJ11 is 4 or 6-pin, RJ45 is an 8-pin connection device), it is obvious that the RJ45 plug cannot be inserted into the RJ11 socket. However, it is physically feasible (RJ11 plug is smaller than RJ45 jack), which makes people think that they should or can work together. It's not. It is strongly recommended not to use RJ11 plug for RJ45 socket.



⒍ because RJ11 is not internationally standardized, its size, insertion force, insertion angle, etc. are not in accordance with the international standard connector design requirements, so interoperability cannot be guaranteed. They even cause damage to both. Since the RJ11 plug is smaller than the RJ45 socket, the plastic parts on both sides of the plug will damage the metal pin of the inserted socket.



RJ - 45 port is our most common port, it is our common twisted pair Ethernet port



Because twisted pair is mainly used as transmission medium in Fast Ethernet, RJ-45 port can be divided into 10Base-T network RJ-45 port and 100base TX network RJ-45 port.



Among them, the RJ-45 port of 10Base-T network is usually identified as "eth" in the router, while the RJ-45 port of 100base TX network is usually marked as "10 / 100btx". This is mainly due to the fact that most products of Fast Ethernet router still adopt 10 / 100Mbps bandwidth adaptive.



The left figure shows the RJ-45 port of 10Base-T network, while the right figure shows the RJ-45 port of 10 / 100base-tx network. In fact, the two RJ-45 ports are exactly the same in terms of the port itself, but the corresponding network circuit structure in the ports is different, so they can not be connected casually.



Definition of RJ45 interface pin signal



Ethernet 10 / 100Base-T interface:



1 TX + tranceive data +



2 TX - tranceive data -



3 RX + receive data +



4 N / C not connected



5 N / C not connected



6 RX - receive data



7 n / C not connected



8 N / C not connected



Ethernet 100base-t4 interface:



1 TX_ D1 + tranceive data +



2 TX_ D1 - tranceive data



3 RX_ D2 + receive data +



4 BI_ D3 + bi directional data +



5 BI_ D3 bi directional data



6 RX_ D2 - receive data



7 BI_ D4 + bi directional data +



8 BI_ D4 bi directional data



Note: RJ45 interface adopts differential transmission mode, TX + and TX - are a pair of twisted pair, which can reduce interference when twisted together.

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