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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
Open the
6.5_rfid_write.py
file under the path ofeuler-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 Upload the Libraries to Pico.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 ofeuler-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(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.