7.8 RFID Music Player

Through our previous project, 6.5 Radio Frequency Identification, 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

Schematic

sch_music_player

Wiring

wiring_rfid_music_player

Code

  1. 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.

  2. After running, type EEFGGFEDCCDEEDD EEFGGFEDCCDEDCC in the Shell and then put the card (or key) close to the MFRC522 module, this way an Ode an Joy score is stored in.

  3. 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.

    from mfrc522 import SimpleMFRC522
    import machine
    import time
    from ws2812 import WS2812
    import urandom
    
    # ws2812
    ws = WS2812(machine.Pin(16),8)
    
    # mfrc522
    reader = SimpleMFRC522(spi_id=0,sck=2,miso=4,mosi=3,cs=5,rst=0)
    
    # 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] = 0x0000FF
        ws[index] = 0xFF0000 # 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()
    
  4. 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.