Solutions are more and miscellaneous WSN promotion threshold
WSN (Wireless Sensing Network) has been applied in various fields in recent years, such as military national defense, scientific fields, environmental monitoring, transportation, warehousing logistics, medical care, agricultural prevention, smart building, oil and gas, bridge river, Too flight, etc. Through the plurality of sensing nodes, the sensing and collection of information will be transmitted to the central control computer through the wireless manner to be used as a purpose of collections, analysis, early warning, and anti-damage.
Monitor the WSN network quality Open Sniffer composition architecture (Figure / SEWIO)
Early industrial WSNs have no common system specifications, in the design of node deployment and system, must spend a lot of time, spending for a few years, to test, correction, improvement, causing WSN implementation obstacles.
Since the Node components of the WSN are mainly MEMS (micro-electromechanical system) sensors, with RF (wireless radio frequency) communication wafers, processors (usually used by MCU microcontrollers), electricity (battery, power, solar, etc.), Add autonomous and smart function (adjustable routing, wisdom collection, fault tolerance, etc.).
In order to make WSN's operation more efficient, many wafer plants, Netcom Factory, and System Solutions Factory have successively put into the development of new generation WSN hardware components, as well as related product solutions, provide simple installation, adapt to all harsh environments, overstails Time sensing, accurate sensing, various power saving modes, information security, etc., to attract customers import use to save testing and deployment.
Cultural use panel design in WSN sensor
Many sensors are currently designed with a MEMS component. The sensor species used by WSN can be said to be included, such as power / inertial motion (accelerator, gyroscope, LVDT, linear variation differential transformer), pressure (pressure gauge, sphygmomanometer), magnetic (magnetic) ), Optical (ambient light sensor, hydraulic sensor, photovoltaic sensor), chemical, gas (carbon monoxide, carbon dioxide, air, oxygen, hydrogen, methane), thermal energy (heat .
There is also a fluid class (flow meter), a position class (GPS satellite navigation, LVDT, encoder), visual class (camera), radio frequency (intensity detector, RSSI, received signal strength indicator, etc.), rotating class (Magnetometer, encoder), humidity (humidity), height class (air pressure gauge), color class (color meter), volume class (differential interferometer, larier interferometer), quantity class (optical viewer) Wait), etc.. In addition, many sensors are also used in the computer, such as a content class (host board temperature), identification class (fingerprint recognizer), activity class (overclock detection, etc.).
WSN's development board has expansion capabilities in the system, which can connect the above-described sensor through a daughterboard to expand its sensing function; when the sensing demand is changed, only the panel is required. I.e.
Strive to make overall low power WSN node product solutions
WSN's sensing nodes require low power design, and its network transmission specification is based primarily based on IEEE 802.15.4, based on the wireless transmission agreement of this underlying standard specification, ZigBee, 6LowPan, etc. The WSN's information collected the gateway, and the Wi-Fi, Bluetooth, Action Network, and other agreements used in the computer can be used to pass the information to the central host.
Therefore, the system wafer factory has introduced WSN-specific RF wafers, and there is also a SOC (system single wafer) that integrates RF function. It has a small size and low power characteristics; and also launched a WSN development module. Connect the sensor subboard solution. These manufacturers include ATMEL, ST (STAC), Silicon Labs, Linear Technology, Live, Libelium, Digi, Rohm, etc.
For example, ST-launched STM32W MCU family is based on IEEE 802.15.4 SOC, using ARM Cortex-M3 24MHz processor, built-in 64 ~ 128kb flash memory, with 8K SRAM. Support Zigbee and 6lowPan Agreement, and with AES -128 hardware encryption function to ensure data transmission security.
Atmel's XPlained Series Hardware Development Assessment Platform, there is a self-owned 32-bit ARM Cortex-M0 + 48MHz (AtsamR21 series, providing 64K to 256KB flash memory, hard body touch function), or lower power consumption The 8-bit AVR MCU selection (a wide temperature environment of -40 ° C ~ + 125 ° C), and wireless communication supports 802.15.4 and ZigBee and other applications.
The EMBER ZigBee development tools launched by Silicon Labs use the EM35X series SOC. Its EM351 / EM357 high-performance series, built-in 32-bit ARM CORTEX-M3 processor, operational time is 6, 12, 24MHz, including 128 ~ 192kb Flash memory, with read protection, 12KB RAM, AES-128 hardware encryption function. Suitable for applications in smart energy collection, construction or home automation control, safety monitoring, and WSN applications.
Other WSN Product Applications & Solutions
Linear Technology is based on its own research and development experience in energy, launches the product of Dust Networks-SMART NetWorks product solutions-SmartMesh IP and SmartMesh Wirelesshart, which launches Industrial Field. .4E Technical Specification), while the latter includes LTC5800 / 5900/5901/5902-WHM (based on IEC 62591 Wirelesshart specification).
The processor uses a 32-bit ARM Cortex-M3 architecture, with AES-128 hardware encryption, performs its DUST embedded SmartMesh IP network software, with wisdom network analysis functions, allows each node to connect each other. In addition, ultra-low power consumption below 50ua is supplied with energy acquisition modules, each sensing node can be supplied to power supply to extend battery life, and even exempt batteries. Suitable for applications in data centers, industrial automation, regenerative energy, long-range monitoring, transportation, etc.
In addition, Open Sniffer, like SEWIO is a WSN network traffic and quality monitoring products. The principle is to connect to the device via a remote computer through a remote computer, obtaining a WSN network operation; it can be installed in an indoor environment with a sensing network to detect whether the WSN is operating normally. There is no other signal interference or hacker attack.
It supports IEEE 802.15.4, zigbee, 6lowpan and other Mesh network architectures, and up to 31 wireless channels, suitable for wireless transmission environments around the world. The product is based on light and power-saving, weight 130g, volume 101x72mm, consumption is only 250mA. Only, only network browser, Wireless software), provide customer diagnosis WSN environment.
RFID in WSN application
RFID (Radio Frequency Identification) System, is currently widely used in life. The principle is mainly composed of electronic tags (TAG), reader, when the card reader and RFID TAG are closely induced, you can quickly identify the ID, and be Various applications. Like logistics management, all venues, leisure cards, electronic tickets, animal wafers, and highway electronic charge (ETAG), etc., these mostly used passive RFID technology, label does not need to build a battery, only need to set up The fixed distance is induced and the reader can be energized and the data read and calculation is performed.
As for the active RFID technology, the label itself has a battery, the induction distance is long, the memory is large and readily-written, which can actively detect the surrounding RFID card reader, transfer the information over. Since the active RFID can form an effective activity area around, the application range is wider. For example, an indoor location that is not received in the indoor positioning, providing positioning requirements. If you are deploying a variety of RFID card reader, identification machine, you can play applications such as personnel positioning, vehicle control, and artistic tracking. However, the active RFID has a large label volume, and the battery has a life limit, and the cost is also high.
At present, most of RFID only has only simple identification and does not build any sensors. Unless special applications (such as RFID tags of the blood bag, the temperature of the temperature can be detected at any time), and there are also manufacturers to develop RFID-based WSN sensing networks, using 1 pair 1 induction method, application Environmentally sensing control places such as companies, factories, hospitals, etc. There are also scholars to propose RFID + WSN's Hybrid (hybrid) integration scheme, in the same way, WSN sensing nodes or sensing brakes that must also be built, which also built the RFID reader, so they do not have to deploy twice. In addition to the use of environmentally sensing, it is also possible to simultaneously control personnel or items.
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Source: Wiku Electronic Market Network
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