Introduction to Rfid Reader

RFID tagging is an ID system that uses small frequency identification devices for identification and tracking purposes. An RFID tagging system includes the tag itself, a read/write device, and a number system application for data collection, processing, and transmission.

In simple words, RFID uses electromagnetic fields to transfer data over short distances. RFID is beneficial to spot people, to form transactions, etc.

You can use an RFID system to open a door. for instance, only the person with the proper information on his card is allowed to enter. An RFID system uses:

> tags attached to the thing to be identified, during this example we have got a keychain and an electromagnetic card. Each tag has its own identification (UID).

>> two-way radio transmitter-receiver, the reader, that sends a signal to the tag and read its response Radio transmitter-receiver

How does it Work?

The EM-18 RFID Reader module operating at 125kHz is a cheap solution for your RFID based application. The Reader module comes with an on-chip antenna and may be powered up with a 5V power supply. Power-up the module and connect the transmit pin of the module to receive the pin of your microcontroller. within the reading distance and therefore the card number is thrown at the output. Optionally the module is often configured for also a Weigand output. RFID means radio-frequency identification. RFID uses electromagnetic fields to transfer data over short distances. RFID is beneficial to spot people, to form transactions. 

You can use an RFID system to open a door. for instance, only the person with the proper information on his card is allowed to enter. An RFID system uses tags attached to the thing to be identified, during this example, we have got a key chain and an electromagnetic card. Each tag has its own unique identification (UID). two-way radio transmitter-receiver, the reader, that sends a sign to the tag and reads its response.

Pinout of Rfid Reader

So that’s the basic working principle and now let’s see how we can use RFID with Arduino and build our own RFID door lock.

01. SDA————————Any Digital Pin

02. SCK————————Any Digital Pin

03. MOSI———————-Any Digital Pin

04. MISO———————-Any Digital Pin

05. IRQ————————unconnected

06. GND———————–GND

07. RST————————Any Digital Pin

08. 3.3V————————3.3V (DO NOT CONNECT TO 5V)

EM-18 Features and Specifications

  1. Operating voltage of EM-18: +4.5V to +5.5V
  2. Current consumption: 50mA
  3. Can operate: on LOW power
  4. Operating temperature: 0ºC to +80ºC
  5. Operating frequency:125KHz
  6. Communication parameter: 9600bps
  7. Reading distance: 10cm, depending on TAG
  8. Integrated Antenna.

Application

  1. Robotics
    2. Security systems
    3. Medical tags
    4. Computer Peripherals
    5. Package Identification
    6. Theft protection systems
    7. Data authorization
    8. Unique Identity
    9. Body implants
    10. Typical Applications e-Payment
    11. e-Toll Road Pricing
    12. e-Ticketing for Events
    13. e-Ticketing for Public Transport
    14. Access Control
    15. PC Access
    16. Authentication
    17. Printer / Production Equipment
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