RFID Application with Raspberry Pi

Hello everyone. In this application, when we scan a card with the ID we specified, the LED will turn on, while when we scan a different card, the LED will turn off. You can follow my GitHub account for the project source codes:

Click for Details

Technologies Used

• Raspberry Pi
• Python
• RC522

Raspberry Pi

Before starting the project, you can perform the Raspberry Pi setup by using the link here where I explained it in detail. First, I made the necessary configurations for the project. For this, I needed to enable SSH, SPI, and VNC in the Raspberry Pi settings so I could use it on my computer.

• SSH: Provides remote command line connection over the network. For security reasons, we need to not activate the SSH interface without changing the password of the "pi" user.
• VNC: Provides remote desktop connection over the network.
• SPI: Activates the hardware SPI connection. If we want to use a device with SPI connection via GPIO pins (sensor, RFID reader, LCD screen, etc.), we need to activate it.

Then I prepared the necessary circuit components:

• Raspberry Pi
• Breadboard
• RC522 RFID kit
• LED
• 220 Ω resistor
• Jumper cable

Then I made my circuit drawing with Fritzing.

Then I carefully prepared my circuit.

After completing our circuit connection, we first need to install the necessary library for our Python code to work:

sudo pip install pi-rc522

We save the following Python code to a file named rfid-read.py.

from pirc522 import RFID
import signal
import time

rdr = RFID()
util = rdr.util()
util.debug = True
print("Waiting for card...")
rdr.wait_for_tag()
(error, data) = rdr.request()

if not error:
 print("Card Detected!")
 (error, uid) = rdr.anticoll()
 if not error:
 kart_uid = str(uid[0])+" "+str(uid[1])+" "+str(uid[2])+" "+str(uid[3])+" "+str(uid[4])
 print(kart_uid)

After saving the code;

python rfid-read.py

we run it with the command and scan our card. This way we can learn the UID of the card we scanned.

It gave me such an ID. I noted this ID aside. Then I saved the following code to a file named rc522.py.

from pirc522 import RFID
import signal
import time
import RPi.GPIO as GPIO 

ledpin = 7
GPIO.setmode(GPIO.BOARD)
GPIO.setup(ledpin, GPIO.OUT)
rdr = RFID()
util = rdr.util()
util.debug = True

while True:
 rdr.wait_for_tag()
 (error, data) = rdr.request()
 if not error:
 print("\nCard Detected!")
 (error, uid) = rdr.anticoll()
 if not error:
 # Print UID
 kart_uid = str(uid[0])+" "+str(uid[1])+" "+str(uid[2])+" "+str(uid[3])+" "+str(uid[4])
 print(kart_uid)
 if kart_uid == "xxxxxxxxxxxxxxxx":
 print("LED Turned On!")
 GPIO.output(ledpin, True) 
 else: 
 print("LED Turned Off!")
 GPIO.output(ledpin, False)

I replaced the UID I copied earlier with the value in this code at

if kart_uid == "xxxxxxxxxxxxxxxx":

line. This way, when the program detects the RFID card we scanned, it will turn on the LED we connected. When we scan a different card, the LED will turn off: