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.. _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!


**Schematic**

|sch_music_player|



**Wiring**

|wiring_rfid_music_player| 

**Code**

#. Open the ``6.5_rfid_write.py`` file under the path of ``euler-kit/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 ``euler-kit/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
        ws = WS2812(machine.Pin(0),8)

        # mfrc522
        reader = SimpleMFRC522(spi_id=0,sck=18,miso=16,mosi=19,cs=17,rst=9)

        # buzzer
        NOTE_C4 = 262
        NOTE_D4 = 294
        NOTE_E4 = 330
        NOTE_F4 = 349
        NOTE_G4 = 392
        NOTE_A4 = 440
        NOTE_B4 = 494
        NOTE_C5 = 523

        buzzer = machine.PWM(machine.Pin(15))
        note=[NOTE_C4,NOTE_D4,NOTE_E4,NOTE_F4,NOTE_G4,NOTE_A4,NOTE_B4,NOTE_C5]

        def tone(pin,frequency,duration):
            pin.freq(frequency)
            pin.duty_u16(30000)
            time.sleep_ms(duration)
            pin.duty_u16(0)


        # lightup
        def lumi(index):
            for i in range(8):
                ws[i] = 0x000000
            ws[index] = int(urandom.uniform(0, 0xFFFFFF))  
            ws.write() 

        # encode text to index
        words=["C","D","E","F","G","A","B","N"]
        def take_text(text):
            string=text.replace(' ','').upper()
            while len(string)>0:
                index=words.index(string[0])
                tone(buzzer,note[index],250)
                lumi(index)
                new_str=""
                for i in range(0, len(string)):
                    if i != 0:
                        new_str = new_str + string[i]
                string=new_str

        # read card
        def read():
            print("Reading...Please place the card...")
            id, text = reader.read()
            print("ID: %s\nText: %s" % (id,text))
            take_text(text)
            
        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.