Install the Required Libraries
You will need to install the PN532 library onto your Raspberry Pi. In the terminal, enter:
pip install adafruit-circuitpython-pn532
Download the Project Bundle
Once you've finished setting up your Raspberry Pi with Blinka and the library dependencies, you can access the Python code files, Blinka graphic, and CSV file by downloading the Project Bundle.
To do this, click on the Download Project Bundle button in the window below. It will download as a zipped folder.
# SPDX-FileCopyrightText: Copyright (c) 2024 Liz Clark for Adafruit Industries
#
# SPDX-License-Identifier: MIT
import subprocess
import csv
from datetime import datetime
import os
import tkinter as tk
from PIL import Image, ImageTk
import board
import busio
from digitalio import DigitalInOut
from adafruit_pn532.spi import PN532_SPI
# ---- Update these file paths for your raspberry pi! ----
username = "YOUR-USERNAME"
image_path = f"/home/{username}/Pictures/blinka.png"
movie_path = "/mnt/movie_disk"
csv_file = "movies.csv"
# ----
if not os.path.isfile(csv_file):
with open(csv_file, mode='w', newline='') as f:
writer = csv.writer(f)
writer.writerow(['uid', 'movie'])
root = tk.Tk()
root.attributes("-fullscreen", True)
root.configure(background="black")
screen_width = root.winfo_screenwidth()
screen_height = root.winfo_screenheight()
root.geometry(f"{screen_width}x{screen_height}+0+0")
def toggle_fullscreen():
root.attributes("-fullscreen", not root.attributes("-fullscreen"))
def exit_fullscreen():
root.destroy()
root.bind("<F11>", toggle_fullscreen)
root.bind("<Escape>", exit_fullscreen)
image = Image.open(image_path)
photo = ImageTk.PhotoImage(image)
image_label = tk.Label(root, image=photo, bg="black")
image_label.place(x=0, y=0)
info_label = tk.Label(root, text = "00:00: AM", font=("Helvetica", 68), fg="white", bg="black")
info_label.place(x=1870, y = 1030, anchor="se")
x_pos, y_pos = 100, 100
x_speed, y_speed = 1, 1
spi = busio.SPI(board.SCK, board.MOSI, board.MISO)
cs_pin = DigitalInOut(board.D24)
pn532 = PN532_SPI(spi, cs_pin, debug=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 RFID/NFC card...")
now_playing = False
# pylint: disable=global-statement
def move():
global x_pos, y_pos, x_speed, y_speed
x_pos += x_speed
y_pos += y_speed
if x_pos + photo.width() >= root.winfo_screenwidth() or x_pos <= 0:
x_speed = -x_speed
if y_pos + photo.height() >= root.winfo_screenheight() or y_pos <= 0:
y_speed = -y_speed
image_label.place(x=x_pos, y=y_pos)
root.after(30, move)
def get_movie(uid):
with open(f"/home/{username}/{csv_file}", "r") as file:
reader = csv.DictReader(file)
for row in reader:
if row["uid"] == uid:
return row["movie"]
return None
def read_card():
global now_playing
uid = pn532.read_passive_target(timeout=0.05)
# Try again if no card is available.
if uid is not None:
print("Found card with UID:", [hex(i) for i in uid])
title = str([hex(i) for i in uid])
movie_name = get_movie(title)
if movie_path:
video = f"{movie_path}/{movie_name}.mp4"
subprocess.run(["sudo", "-u", username, "vlc", "--fullscreen", video], check=False)
now_playing = True
else:
current_time = datetime.now().strftime("%I:%M %p")
info_label.config(text=f"{current_time}")
root.after(2000, read_card)
def vlc_check():
global now_playing
try:
result = subprocess.check_output(["pgrep", "-x", "vlc"])
if result:
return True
else:
return False
except subprocess.CalledProcessError:
now_playing = False
return False
root.after(5000, vlc_check)
if not now_playing:
move()
read_card()
if now_playing:
vlc_check()
root.mainloop()
After downloading the Project Bundle, move the folder to your /home/user directory. Then, unzip the folder by right-clicking on the folder in the File Manager and selecting Extract or with your preferred command line tool. Keep the following files in the /home/user directory:
- add_movie.py
- nfc_movie_player.py
- movies.csv
Move the blinka.png graphic to the /home/user/Pictures folder.
File Explanation
The main script is the nfc_movie_player.py file. This Python script launches a graphical background and bounces the Blinka image around the screen. When you scan an NFC card, the script reads the card and compares it to the entries in the movies.csv file. If the card exists in the CSV file, then the associated movie starts to play via VLC.
The CSV file can be edited manually or by using the add_movie.py Python script. More information on this script is available on the Add New Movies Python Code page in the guide.
Customize the Script
At the top of the nfc_movie_player.py file are some user configuration options. You'll need to edit these options to match the file paths and user name on your Raspberry Pi.
# ---- Update these file paths for your raspberry pi! ----
username = "YOUR-USERNAME"
image_path = f"/home/{username}/Pictures/blinka.png"
movie_path = "/mnt/movie_disk"
csv_file = "movies.csv"
# ----
Make sure you edit your Raspberry Pi OS username in the script!
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