This is an Arduino based project which uses RFID tags to gain access of a door!...This project is rather a prototype as i have built the whole system onto a small door which i managed to make!

This project was just an idea which popped into my mind during the vacation and turned out to be a very secure and successful method of accessing a door!

Step 1: Gathering the Parts...

Arduino UNO
Arduino RFID Reader (rc552 Module)
Servo Motor (Tower PRO SG-5010)
9v battery or 7.2v LI-ion Battery (two 18650 battries in series)
Acrylic Pieces to make a small hinge to move the lock
Arduino Jumper Wires
Two LEDs (Green and Red)
Two 100 ohm resistor

In Case you'll want to make a small door like me you would need...

Door Lock
Door Knob
Door Hinge

Step 2: Connecting the Wires...

Initially we can start with the connection to the Arduino UNO from the RFID module:

SDA Pin Digital Pin 10
SCK Pin Digital Pin 13
MOSI Pin Digital Pin 11
MISO Pin Digital Pin 12
RST/Reset Pin Digital Pin 9
VCC Pin 5V Pin
GND Pin GND Pin

Next We connect the Servo Pins to the Arduino:

GND Pin GND pin
VCC Pin 5v Pin
Signal Pin Digital Pin 3

Next is connecting the LEDs

The Red LEDs Anode is connected to Digital Pin 7 via a 100ohm resistor and the Green LEDs Anode is connected to Digital Pin 6 via a 100 ohm resistor whereas the Cathode is to a common GND Pin of the Arduino!

Step 3: Uploading the Code and Testing the System!!!

I have attached the code and the library above,so you'll should copy the library to the Arduino destination folder and then upload the code!!!

Next you open the serial monitor of the COM port the Arduino is currently attached to and place an RFID Tag (the tag you wish to gain access for the door) on the reader, and you should get an error message like in the pic above!

Immediately copy the code No. in it and paste it in the original Arduino program i attached (as marked "xxxxx" in the pic)

Then Re-upload the new code into the Arduino and test the system!

It should work!