RFID, Radio Frequency Identification is a technology, which includes wireless data capture and transaction processing. It is a wireless non-contact system that uses radio-frequency electromagnetic fields to transfer data from a tag attached to an object, for the purposes of automatic identification and tracking. The tag contains electronically stored information which can be read from up to several meters (yards) away. Unlike a bar code, the tag does not need to be within line of sight of the reader and may be embedded in the tracked object.
RFID reader is a device that is used to interrogate an RFID tag. The reader has an antenna that emits radio waves; the tag responds by sending back its data.
A number of factors can affect the distance at which a tag can be read (the read range). The frequency used for identification, the antenna gain, the orientation and polarization of the reader antenna and the transponder antenna, as well as the placement of the tag on the object to be identified will all have an impact on the RFID system’s read range.
RFID tag is a microchip combined with an antenna in a compact package; the packaging is structured to allow the RFID tag to be attached to an object to be tracked.
The tag's antenna picks up signals from an RFID reader or scanner and then returns the signal, usually with some additional data (like a unique serial number or other customized information).
Traditionally, Parents always have been at the worrying edge concerning the safety of their ward en-route to school, and the schools always have had to be responsibly transport the students to and from their respective homes.
RFID helps to reduce the concerns by automating the detection of entry/exit of children at the school.
Parent can be informed, by sending message that their kids have safely arrived or left school gates.
Each student wears a tag with unique ID. When he/she enter the gate, reader nearby detect tag ID immediately and upload information to system to inform his/her parents via SMS or email.
When student leave school, the reader nearby detects tag ID immediately and upload information to system to inform his/her parents via SMS or email.
This solution can be scaled up to involve student tracking within the campus, such as visits to the Library, Play area, Food-court and other various internal facilities.
Tracking school staff such as janitors/housekeeping staff, teaching staff, etc can also be done to enable quick paging for emergencies etc.
RFID can be used in a variety of applications such as: