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Click [|link_sf_facebook|] and join today! .. _py_music_player: 7.8 RFID Music Player ========================== Through our previous project, :ref:`py_rfid`, we learned that the MFRC522 module allows us to write up to 48 letters of information to the card (or key), including both the key and identity information, as well as the music score. As an example, if you write ``EEFGGFEDCCDEEDD EEFGGFEDCCDEDCC``, the buzzer will play the music when the card (or key) is read again. It can also be equipped with an WS2812 to display amazing effects. You can find more sheet music on the Internet, or even write your own music, put them into the card (or key), and share them with your friends! |rfid_player| **Required Components** In this project, we need the following components. It's definitely convenient to buy a whole kit, here's the link: .. list-table:: :widths: 20 20 20 :header-rows: 1 * - Name - ITEMS IN THIS KIT - LINK * - Kepler Kit - 450+ - |link_kepler_kit| You can also buy them separately from the links below. .. list-table:: :widths: 5 20 5 20 :header-rows: 1 * - SN - COMPONENT - QUANTITY - LINK * - 1 - :ref:`cpn_pico_w` - 1 - |link_picow_buy| * - 2 - Micro USB Cable - 1 - * - 3 - :ref:`cpn_breadboard` - 1 - |link_breadboard_buy| * - 4 - :ref:`cpn_wire` - Several - |link_wires_buy| * - 5 - :ref:`cpn_transistor` - 1(S8050) - |link_transistor_buy| * - 6 - :ref:`cpn_resistor` - 1(1KΩ) - |link_resistor_buy| * - 7 - Passive :ref:`cpn_buzzer` - 1 - |link_passive_buzzer_buy| * - 8 - :ref:`cpn_mfrc522` - 1 - |link_rfid_buy| * - 9 - :ref:`cpn_ws2812` - 1 - |link_ws2812_buy| **Schematic** |sch_music_player| **Wiring** |wiring_rfid_music_player| **Code** #. Open the ``6.5_rfid_write.py`` file under the path of ``kepler-kit-main/micropython``, then click "Run Current Script" or simply press F5 to run it. .. note:: Here you need to use the libraries in ``mfrc522`` folder, please check if it has been uploaded to Pico, for a detailed tutorial refer to :ref:`add_libraries_py`. #. After running, type ``EEFGGFEDCCDEEDD EEFGGFEDCCDEDCC`` in the shell, then bring the card (or key) close to the MFRC522 module to store a score of "Ode to Joy". #. Open the ``7.8_rfid_music_player.py`` file under the path of ``kepler-kit-main/micropython`` or copy this code into Thonny, then click "Run Current Script" or simply press F5 to run it. .. code-block:: python from mfrc522 import SimpleMFRC522 import machine import time from ws2812 import WS2812 import urandom # WS2812 LED setup # Initialize an 8-LED WS2812 strip on pin 0 ws = WS2812(machine.Pin(0), 8) # MFRC522 RFID reader setup # Initialize the RFID reader using SPI on specific pins reader = SimpleMFRC522(spi_id=0, sck=18, miso=16, mosi=19, cs=17, rst=9) # Buzzer note frequencies (in Hertz) NOTE_C4 = 262 NOTE_D4 = 294 NOTE_E4 = 330 NOTE_F4 = 349 NOTE_G4 = 392 NOTE_A4 = 440 NOTE_B4 = 494 NOTE_C5 = 523 # Initialize PWM for buzzer on pin 15 buzzer = machine.PWM(machine.Pin(15)) # List of note frequencies corresponding to musical notes note = [NOTE_C4, NOTE_D4, NOTE_E4, NOTE_F4, NOTE_G4, NOTE_A4, NOTE_B4, NOTE_C5] # Function to play a tone on the buzzer with a specified frequency and duration def tone(pin, frequency, duration): pin.freq(frequency) # Set the buzzer frequency pin.duty_u16(30000) # Set duty cycle to 50% (approx) time.sleep_ms(duration) # Play the tone for the specified duration pin.duty_u16(0) # Stop the tone by setting duty cycle to 0 # Function to light up a WS2812 LED at a specific index with a random color def lumi(index): for i in range(8): ws[i] = 0x000000 # Turn off all LEDs ws[index] = int(urandom.uniform(0, 0xFFFFFF)) # Set a random color for the LED at the given index ws.write() # Write the color data to the WS2812 LEDs # Encode musical notes text into indices and play the corresponding notes words = ["C", "D", "E", "F", "G", "A", "B", "N"] # Mapping of musical notes to text characters def take_text(text): string = text.replace(' ', '').upper() # Remove spaces and convert the text to uppercase while len(string) > 0: index = words.index(string[0]) # Find the index of the first note in the string tone(buzzer, note[index], 250) # Play the corresponding note on the buzzer for 250 ms lumi(index) # Light up the LED corresponding to the note string = string[1:] # Move to the next character in the string # Function to read from the RFID card and play the stored score def read(): print("Reading...Please place the card...") id, text = reader.read() # Read the RFID card (ID and stored text) print("ID: %s\nText: %s" % (id, text)) # Print the ID and text take_text(text) # Play the score from the text stored on the card # Start reading from the RFID card and play the corresponding score read() #. By putting the card (or key) close to the MFRC522 module again, the buzzer will play the music stored on the card (or key), and the RGB strip will light up in a random color.