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!

Schematic

Wiring

Code

1. 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.

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 euler-kit/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] = 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()
   

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.