First, the broad application prospect of WiFi wireless sensor sensor network
The wireless sensor network consists of a large number of inexpensive, miniature, energy-saving sensor nodes deployed in the detection area, and forms a network system by wireless communication. Its main purpose is to cooperatively perceive, collect and process the information of the perceived objects in the network coverage area. Receive commands and exchange real-world information with the Control Center. If the Internet constitutes a logical information world and changes the way people communicate with each other, wireless sensor networks combine the logical information world with the objective physical world to change the interaction between humans and nature. the way.
Wireless sensor networks are listed by BusinessWeek as one of the top 10 most influential technologies in the world in the 21st century, and are listed by the Massachusetts Institute of Technology (MIT) Technology Review as the world's three high-tech industries in the future; Compared with the popular 802.15.4 standard and the zigbee wireless sensor network, the WiFi/IEEE 802.11b/g network is a more mature technology with obvious advantages in device interoperability; this IP-based networking technology can be implemented very conveniently. Seamlessly connect to networks already installed in businesses and homes, and should be more secure.
When WiFi / IEEE 802.11b / g wireless network signals, in the near future, like a piece of "wireless cloud" covering each of our "wireless cities" over and covering each of our families, every commercial building At the time, the following pictures will become a reality.
Picture 1: Various types of electricity meters, water meters, and low-power wireless WiFi SoCs in thousands of households, through WI-FI wireless network, with low power consumption, and energy companies such as power companies maintain networks Real-time contact, the digital display system in the home will inform you when the energy price is the lowest, you can pay with low-cost energy, and if there is a problem with your energy equipment, the energy company will also repair it for the first time.
Payment and meter reading are done automatically by wireless...
Picture 2: Inside the commercial building of the city, tens of thousands of working wireless sensors, including security, temperature, humidity, smoke alarms, etc., all use the existing WiFi wireless SoC as the core node for automatic wireless connection, central control The system, according to the large amount of information of these wireless sensors, adjusts the air conditioning system, monitors the building security, is a safer and more energy efficient commercial building.
Picture 3: Huge logistics warehouses, large trucks, forklifts, come and go, each piece of goods is equipped with a wireless WiFi SoC chip with positioning function, through the 802.11 wireless network that has been widely deployed in the warehouse, each cargo is Accurate positioning, and easy access to detailed information on the goods...
From a development perspective, WiFi wireless sensor sensor network applications include a variety of wireless sensors, wireless real-time positioning networks, radio frequency identification (RFID) networks, digital home networks, security surveillance networks, etc., with a very broad application prospects and business prospect.
Second, choose the right wireless WiFi SoC (single chip)
For a long time, although the 802.11 standard has become one of the mainstream directions of global wireless network development, but in many people's minds, WiFi / IEEE 802.11b / g technology power consumption is relatively high, only for wireless connections between computers and other High-speed wireless connection applications, in fact, the evolution of wireless technology and SoC technology, in recent years, there have been several WiFi wireless SoC chips suitable for low-power applications mentioned below, we just need to choose them, we can use Designed for our own WiFi wireless sensor sensor network;
The G2C501 developed by G2 Microsystems is an early introduction of an ultra-low-power IEEE 802.11 (Wi-Fi) chip (SoC). As shown in Figure 1, the chip integrates an 802.11 wireless chip and a baseband chip, including a 32-bit MCU and 80KB SRAM + 320KB ROM, with 125K wireless wake-up and hardware features supporting ISO 24730-2 wireless positioning.
Figure 1 G2C501 System on Chip
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RJ45 interface can be used to connect RJ-45 connectors. It is suitable for the network constructed by twisted pair. This port is the most common port, which is generally provided by Ethernet hub. The number of hubs we usually talk about is the number of RJ-45 ports.
RJ45 is a type of different connectors (for example: RJ11 is also a type of connector, but it is used on the telephone); there are two different ways to arrange the RJ-45 connector: one is white orange, orange, white green, blue, white blue, green, white brown, brown; the other is white green, green, white orange, blue, white blue, orange, white brown, brown; therefore, there are also wires with RJ45 connector There are two kinds: straight line and interleaved line.
The RJ-45 port of the hub can be directly connected to terminal devices such as computers and network printers, and can also be connected with other hub equipment and routers such as switches and hubs. It should be noted that when connecting to different devices, the jumper method of twisted pair cable used is different.
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