Search results
Results from the WOW.Com Content Network
Radio-frequency identification (RFID) uses electromagnetic fields to automatically identify and track tags attached to objects. An RFID system consists of a tiny radio transponder called a tag, a radio receiver , and a transmitter .
A wireless identification and sensing platform (WISP) is an RFID (radio-frequency identification) device that supports sensing and computing: a microcontroller powered by radio-frequency energy. [1] That is, like a passive RFID tag, WISP is powered and read by a standard off-the-shelf RFID reader, harvesting the power it uses from the reader's ...
Machine reader or scanner. This device reads the encoded data, converting them to an alternative form, typically an electrical analog signal. Data decoder. This component transforms the electrical signal into digital data and finally back into the original alphanumeric characters.
A barcode reader or barcode scanner is an optical scanner that can read printed barcodes and send the data they contain to computer. [1] Like a flatbed scanner , it consists of a light source, a lens, and a light sensor for translating optical impulses into electrical signals.
The simplest form of choke point locating is where short range ID signals from a moving tag are received by a single fixed reader in a sensory network, thus indicating the location coincidence of reader and tag. Alternately, a choke point identifier can be received by the moving tag and then relayed, usually via a second wireless channel, to a ...
Flipper Zero is designed for interaction with various types of access control systems, radio protocols, RFID, near-field communication (), and infrared signals. [6] [7] To operate the device, a computer or a smartphone is not required; it can be controlled via a 5-position D-pad and a separate back button.
Like various existing RFID technologies, chipless RFID tags are associated with a specific RF reader, which questions the tag and recovers the information contained in it. The operating principle of the reader is based on the emission of a specific electromagnetic (EM) signal toward the tag, and the capture of the signal reflected by the tag.
The reader has its own antenna, which continuously transmits a short range radio frequency field. When the card is placed within range of the reader, the antenna coil and capacitor, which form a tuned circuit, absorb and store energy from the field, resonating at the frequency emitted by the reader.