'''

Voltaat Learn (http://learn.voltaat.com)

Link to the full tutorial:

Tutorial: How to use RFID sensor with the Raspberry Pi Pico board

This sketch Automatically opens the door using a magnetic card.

Note: You can use this sketch with any Raspberry Pi Pico.

'''

from machine import Pin

from mfrc522 import MFRC522

from servo import Servo

import time

# RFID setup

reader = MFRC522(spi_id=0, sck=2, miso=4, mosi=3, cs=1, rst=0)

# Servo setup

servo = Servo(pin_id=15)

servo.write(0)

# Authorized card UID

CARD = 1373414928

print("RFID reader active...\n")

while True:

   reader.init()

   (stat, tag_type) = reader.request(reader.REQIDL)

   if stat == reader.OK:

       (stat, uid) = reader.SelectTagSN()

       if stat == reader.OK:

           identifier = int.from_bytes(bytes(uid), "little", False)

           if identifier == CARD:

               print("UID: " + str(identifier) + " Access granted")

               # Move servo to 180°

               servo.write(90)

               time.sleep(2)

               # Return servo to 0°

               servo.write(0)

           else:

               print("UID: " + str(identifier) + " Unknown: Access denied")

‍