Arduino RFID | How to Use RFID RC522 with Arduino

Today, we will learn how to use RFID RC522 with Arduino. I will show you how to read RFID tags using RC522 reader module and get unique ID (UID). The unique ID is used to identify each tag uniquly. And we will use UID in the code, to demonstrate how to create a door lock system using Arduino UNO. RFID RC522 reader module is a two-way radio transmitter-receiver module. it sends a signal to the tag, and reads the information stored on RFID tag. RFID RC522 works on 3.3v. You must connect it to 3.3 volts pin of Arduino. Remember, connecting RFID RC522 reader module to Arduino 5v pin will likely destroy your module. RFID means radio-frequency identification. it uses electromagnetic fields to transfer data over short distances. it is useful, to identify people, to make transactions. or You can use an RFID system, to open a door lock, switch ON a relay, light up an LED. or anything else you can think of. Buy Parts: Warning: Never connect RFID RC522 reader module to Arduino 5v pin, otherwise you module will destroyed. Warning: The RFID module might not work, if you connect it on the breadboard. I have tested it many times and always get the following error. "Communication failure, is the MFRC522 properly connected?". So, make sure connect the RFID RC522 module directly to Arduino without using breadboard. -------------------------------------------------------------------------------------------------------------------- Useful Video Links...