This project works by associating a movie file with an NFC card. You could manually type out the UID of each of your cards and movie titles, but a Python script helps to ease this process.
# SPDX-FileCopyrightText: Copyright (c) 2024 Liz Clark for Adafruit Industries
#
# SPDX-License-Identifier: MIT
import csv
import os
import sys
import board
import busio
from digitalio import DigitalInOut
from adafruit_pn532.spi import PN532_SPI
spi = busio.SPI(board.SCK, board.MOSI, board.MISO)
cs_pin = DigitalInOut(board.D24)
pn532 = PN532_SPI(spi, cs_pin, debug=False)
csv_file = "movies.csv"
if not os.path.isfile(csv_file):
with open(csv_file, mode='w', newline='') as file:
writer = csv.writer(file)
writer.writerow(['uid', 'movie'])
def is_duplicate(uid, mov):
with open(csv_file, mode='r') as f:
reader = csv.DictReader(f)
for row in reader:
if row['uid'] == uid or row['movie'] == mov:
return True
return False
ic, ver, rev, support = pn532.firmware_version
print("Found PN532 with firmware version: {0}.{1}".format(ver, rev))
# Configure PN532 to communicate with MiFare cards
pn532.SAM_configuration()
print("Waiting for new RFID/NFC card...")
while True:
the_uid = pn532.read_passive_target(timeout=0.05)
if the_uid is not None:
uid_str = f"{[hex(i) for i in the_uid]}"
movie = input("Enter the name of the new movie: ")
movie = f"{movie}"
if is_duplicate(uid_str, movie):
print("UID {uid_str} or movie {movie} already exists, skipping.")
else:
with open(csv_file, mode='a', newline='') as file:
writer = csv.writer(file)
writer.writerow([uid_str, movie])
print(f"Added UID {uid_str} with movie title {movie} to movies.csv")
sys.exit()
How the Script Works
You'll run the script in a terminal, separate from the main NFC player script. When the script starts, it will wait for an NFC card to be read. When a card is read, it will prompt you to enter a movie title. After you enter the title, the UID from the card and the title are added to the movies.csv file.
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