This is my first Instructable. So in this project i am going to making unlocking your PC with RFID & Arduino Uno which most of the members have after doing this again you have to make few changes in order for to work like a normal arduino board again. So Lets Get Started :-

Step 1: Connecting RFID Scanner to Arduino UNO

The RFID Scanner has 8 Pins and we need 7 Pins from that

Arduino ----------------> RFID Scanner

D9 -----------------> Reset

D10 ------------------> SDA

D11 -----------------> MOSI

D12 -----------------> MISO

D13 -----------------> SCK

GND ----------------> GND

3.3V ------------------> 3.3V

Dont Change D11, D12, D13,

You can Change D9, D10 which are SDA And Reset but need to change in the code also the pins

Step 2: Changing Code and Uploading

First Add MFRC522 Library to Arduino IDE

MFRC522 LIbrary For Arduino IDE

Download the library and Extract it into libraries folder in Arduino Sketch Folder

Now Changing the Code

First go into the code and the UID Number to your UID no you want to gain access as in picture

the line highlighted in picture is the one you have to change in order for your card to work if you want to add more give space a comma again space and another UID of Card

Eg:-

content.substring(1) == "Card 1 " , "Card 2"

Changing the Keystrokes

First Go in the code to

delay(50);

buf[0] = 0;

buf[2] = 0x13; // Change this number 13 to the one in the USBKeyScan.PDF file the key you want to press when card scanned

Serial.write(buf, 8);

releaseKey();

if you want to press more keys after one another

copy the code and paste it below the before one in if statement

and then change the number to key you want to press