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RFID and wireless sensor networks

 on Tuesday, October 18, 2016  

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Radio Frequency Identification (RFID)
Radio frequency identification (RFID) systems provide a powerful technology for tracking the movement of goods throughout the supply chain. RFID systems use tiny tags with embedded microchips containing data about an item and its location to transmit radio signals over a short distance to RFID readers. The RFID readers then pass the data over a network to a computer for processing. Unlike bar codes, RFID tags do not need line-of-sight contact to be read. The RFID tag is electronically programmed with information that can uniquely identify an item plus other information about the item, such as its location, where and when it was made, or its status during production. Embedded in the tag is a microchip for storing the data. The rest of the tag is an antenna that transmits data to the reader.
http://siteeconomics.blogspot.com/2016/10/rfid-and-wireless-sensor-networks.html

RFID uses low-powered radio transmitters to read data stored in a tag at distances ranging from 1 inch to 100 feet. The reader captures the data from the tag and sends them over a network to a host computer for processing.

The reader unit consists of an antenna and radio transmitter with a decoding capability attached to a stationary or handheld device. The reader emits radio waves in ranges anywhere from 1 inch to 100 feet, depending on its power output, the radio frequency employed, and surrounding environmental conditions. When an RFID tag comes within the range of the reader, the tag is activated and starts sending data. The reader captures these data, decodes them, and sends them back over a wired or wireless network to a host computer for further processing (see Figure 7.15). Both RFID tags and antennas come in a variety of shapes and sizes

Active RFID tags are powered by an internal battery and typically enable data to be rewritten and modified. Active tags can transmit for hundreds of feet but may cost several dollars per tag. Automated toll-collection systems such as New York’s E-ZPass use active RFID tags. Passive RFID tags do not have their own power source and obtain their operating power from the radio frequency energy transmitted by the RFID reader. They are smaller, lighter, and less expensive than active tags, but only have a range of several feet.

In inventory control and supply chain management, RFID systems capture and manage more detailed information about items in warehouses or in production than bar coding systems. If a large number of items are shipped together, RFID systems track each pallet, lot, or even unit item in the shipment. This technology may help companies such as Walmart improve receiving and storage operations by improving their ability to “see” exactly what stock is stored in warehouses or on retail store shelves. 
http://siteeconomics.blogspot.com/2016/10/rfid-and-wireless-sensor-networks.html
The small circles represent lower-level nodes and the larger circles represent high-end nodes.  Lower-level nodes forward data to each other or to higher-level nodes, which transmit data more rapidly and speed up network performance.

Continental Tires, used RFID technology to precisely track the location of tire components as they moved through the production process. Walmart has installed RFID readers at store receiving docks to record the arrival of pallets and cases of goods shipped with RFID tags. The RFID reader reads the tags a second time just as the cases are brought onto the sales floor from backroom storage areas. Software combines sales data from Walmart’s point-of-sale systems and the RFID data regarding the number of cases brought out to the sales floor. The program determines which items will soon be depleted and automatically generates a list of items to pick in the warehouse to replenish store shelves before they run out. This information


The cost of RFID tags used to be too high for widespread use, but now it starts at around 7 cents per passive tag in the United States. As the price decreases, RFID is starting to become cost-effective for many applications. In addition to installing RFID readers and tagging systems, companies may need to upgrade their hardware and software to process the massive amounts of data produced by RFID systems transactions that could add up to tens or hundreds of terabytes. Software is used to filter, aggregate, and prevent RFID data from overloading business networks and system applications. Applications often need to be redesigned to accept large volumes of frequently generated RFID data and to share those data with other applications. Major enterprise software vendors, including SAP and Oracle PeopleSoft, now offer RFID-ready versions of their supply chain management applications.

Wireless Sensor Networks
If your company wanted state-of-the art technology to monitor building security or detect hazardous substances in the air, it might deploy a wireless sensor network. Wireless sensor networks (WSNs) are networks of interconnected wireless devices that are embedded into the physical environment to provide measurements of many points over large spaces. These devices have built-in processing, storage, and radio frequency sensors and antennas. They are linked into an interconnected network that routes the data they capture to a computer  for analysis.

These networks range from hundreds to thousands of nodes. Because wireless sensor devices are placed in the field for years at a time without any maintenance  or human intervention, they must have very low power requirements and batteries capable of lasting for years. Figure 7.16 illustrates one type of wireless sensor network, with data from individual nodes flowing across the network to a server with greater processing  power. The server acts as a gateway to a network based on Internet technology. Wireless sensor networks are valuable in areas such as monitoring environmental changes, monitoring traffic or military activity, protecting   property, efficiently operating and managing machinery and vehicles,  establishing security perimeters, monitoring supply chain management, or detecting chemical, biological, or radiological material. helps Walmart reduce out-of-stock items, increase sales, and further shrink its costs.
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RFID and wireless sensor networks 4.5 5 eco Tuesday, October 18, 2016 Radio Frequency Identification (RFID) Radio frequency identification (RFID) systems provide a powerful technology for tracking the movement...


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