This is an simple tutorial for beginner on how to use a MFRC522 module using Arduino

Remarks* I apologize for my english's grammar because i am a chinese :)

Step 1: Collecting Parts and Programs

In this project, you needed these parts :

1.Aruduino Uno R3 (you can also use the other version of Arduino)

2.MFRC522 module

3.Arduino IDE ( you can download it from here https://www.arduino.cc/en/Main/Software )

4.5V relay (not necessary)

5.TIP31 transistor (not needed if you didn't use the 5V relay)

6.Jumper cables

7.LEDs

Programs :

You will need the RFID library and the programs which you can download from the file that i attached . If you don't know how to add a library , here's the link https://www.arduino.cc/en/Guide/Libraries

Step 2: Connecting the Component

Connect the pins with following :

- MOSI ---> PIN 11

- MISO ---> PIN 12

- SCK ---> PIN 13

- SS/SDA ---> PIN 10

- RST ---> PIN 9

- LED ---> PIN 7 & GND

- Relay / Output power ---> VCC connect to 5V pins and the collector pin of the TIP31

- GND connect to GND pins,

- IN connect to emitter pin of TIP31

- Pin 8 is connected to the base pin of the TIP31

*Ways to connect the led and relay is shown on the image above ( i didn't connect the arduino with the mfrc522 module because i didn't know how to make it , so just follow the text above to connect them)

*Double check before you connect your arduino with your computer , the wrong connection could damage your arduino

Step 3: Setting Up for Your Card

First:

Plug your arduino into your computer and select the correct board and com, then verify and upload your sketch

Second:

Open up serial monitor and set your baud to 9600 baud

Third:

Scan your card , your should saw a bunch of numbers pop out

Last:

Copy only the number and paste it to the column after "int cards[][5] = { (replace the space with ',' as shown in the image above, in my case, my card is 5 117 21 219 190 )

You're Done !

Pls comment if you spot any mistake of my instructables or any question to ask me