What Is RFID - Radio Frequency Identification?
RFID based attendance system has an RFID reader, RFID Tag, LCD display & a microcontroller unit that allows the wireless communications to establish the identity of students, faculty, or any other staff. RFID attendance system provides wireless identification of stakeholders when they fall in the radiofrequency range of the RFID attendance reader. To mark the attendance automatically, the students or staff need to carry the RFID tag that contains unique information about them such as class/section/name/ID number. The receiver/reader of the RFID attendance system automatically registers the attendance & saves the attendance data in the system. The administrator can anytime extract the data to get a summary of student attendance history & keep a tab on them as well as faculty attendance for salary & payroll management.
A typical RFID system is made up of three components: Tags (RFID ID Cards), Readers and the host computer system.
Tag(RFID ID Cards):
Tag is made up of an integrated antenna and memory. The information can be written and rewritten on Tag memory. The unique ID written on Tag while manufacturing is known as the EPC (Electronic Product Code). This Tag is enclosed in a Rectangular Plastic Card of the size of Bank Debit / credit card.
An RFID reader is a device that is used to read RFID tag data. The reader has an antenna that emits radio waves; the tag responds by sending back data stored in it to Reader.
It reads/writes data from / to the tags through the reader. It stores and evaluates obtained data and links the transceiver to applications.
Features and benefits of RFID over barcodes
- No line of slight is required to read a RFID card / tag. So no need of Oriented reading like bar code
- Multiple RFID Cards can be read.
- No human error like bar code reading while reading a card. Can be read in any orientation.
- Very Limited data can be stored in bar code.
- Re-usable for other purpose.
Different Types of RFID
There are several versions of RFID that operate at different radio frequencies. The choice of frequency is dependent on the business requirements and read environment. Three primary frequency bands are being used for RFID:
- Low Frequency (125/134KHz) – Most commonly used for Attendance & access control.
- High- Frequency(13.56 MHz) – Used where medium data rate and read ranges up to about 1.5 meters are acceptable. This frequency also has the advantage of not being susceptible to interference from the presence of water or metals.
- Ultra-High-Frequency(850 MHz to 950 MHz) – offer the longest read ranges of up to approximately 3 meters and high reading speeds.
- Active RFID Tags are battery powered. They broadcast a signal to the reader and can transmit over the greatest distances (100+ meters). Typically they can cost Rs. 500 or more and are used to track high value goods like vehicles and large containers of goods. Shipboard containers are a good example of an active RFID tag application.
- Passive RFIDTags do not contain a battery. Instead, they draw their power from the radio wave transmitted by the reader. The reader transmits a low power radio signal through its antenna to the tag, which in turn receives it through its own antenna to power the integrated circuit (chip).
Network LF Readers With Biometric (Thumb) for Attendance
Features & technical sects. of network biometric RFID readers,
- Read and write functions.
- Compact size & Wall mountable.
- User friendly interface.
- Stores Data.
- Finger prints images.
- Attendance record 50,000 to 1,00,000 Record.
- Remote control & real time access & monitoring by Server Program.
- Authentication media : Finger print / Password / RFID card / combination.