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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!

Required Components

In this project, we need the following components.

It’s definitely convenient to buy a whole kit, here’s the link:

Name	ITEMS IN THIS KIT	LINK
Kepler Kit	450+	Kepler Ultimate Kit

You can also buy them separately from the links below.

SN	COMPONENT	QUANTITY	LINK
1	Getting to Know Pico W	1	BUY
2	Micro USB Cable	1
3	Breadboard	1	BUY
4	Jumper Wires	Several	BUY
5	Transistor	1(S8050)	BUY
6	Resistor	1(1KΩ)	BUY
7	Passive Buzzer	1	BUY
8	MFRC522 Module	1	BUY
9	WS2812 RGB 8 LEDs Strip	1	BUY

Schematic

Wiring

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.

   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 1.4 Upload the Libraries to Pico.

2. 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”.

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 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()
   

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.