The remaining components form the EMI filter along with the matching circuit for the antenna. As we know the main component is the MFRC522 chip. The circuit consists of bare minimum components. The Schematic diagram for the RC522 module is given below. RC522 RFID Reader/Writer Module Circuit Diagram It also consists of a PCB antenna for communicating and energizing the RFID tags. The board also consists of the required EMI filter circuit and matching circuit. It is clocked at 27.12MHz by the onboard crystal oscillator in the 49S package. The RC522 module consists of an MFRC522 RFID chip from NXP. The supply voltage can be anywhere from 2.5V to 3.3V and must be connected to the 3.3V pin on the Arduino. GND Ground pin that needs to be connected to the GND pin on the Arduino. IRQ Interrupt signal from the module to indicate RFID tag detection. The pinout of a RFID Reader module is as follows: This module supports various communication protocols and each pin has a different function for each communication protocol. We will learn how to interface an RC522 RFID reader with the Arduino. In this tutorial, we will learn how we can use the RFID technology with the Arduino. They can be also used for identifying livestock, products, etc. RFID tags can expedite the checkout and can be used for antitheft measures. RFID tags are used in many industries and you can find them in product tags from stores to security access cards. As the name indicates, RFID uses electromagnetic waves in the radio frequency spectrum for communication and data transfer. Have you ever wondered how the antitheft system in a supermarket works? Or how do automatic toll payment systems like fast tag work? All the answer to your doubts is RFID or Radio Frequency Identification.
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