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Magic Band Reader

2022-12-20 | By Adafruit Industries

License: See Original Project LED Strips RFID / NFC Adafruit Feather

Courtesy of Adafruit

Guide by Ruiz Brothers

Overview

You can build your own Disney magic band scanner with Adafruit ‎Feather RP2040 and CircuitPython.‎

reader_1

 

 

This project uses the RFID Wiz Kit to scan your Disney magic bands ‎to animate a strip NeoPixels and plays your favorite sound effects.‎

project_2

Prerequisite Guides

Take a moment to review the guides.‎

Parts

Circuit Diagram

The diagram below provides a visual reference for wiring of the ‎components. This diagram was created using the software ‎package Fritzing.‎

Adafruit Library for Fritzing

Use Adafruit's Fritzing parts library to create circuit diagrams for your ‎projects. Download the library or just grab individual parts. Get the ‎library and parts from GitHub - Adafruit Fritzing Parts.‎

fritzing_3

Wired Connections

The Wiz Kit is powered by the 12V 2A power supply wall adapter. The ‎Feather is powered by USB 5V 1A power supply wall adapter.‎

MAX98357A Amp

  • LRC to D25 pin on Feather

  • BCLK to D24 pin on Feather

  • DIN to A3 pin on Feather

  • VIN to 3.3V pin on Feather

  • GND to GND pin on Feather

NeoPixel Strip

  • ‎5V to USB pin on Feather

  • GND to GND pin on Feather

  • Din to D6 pin on Feather

Wiz Kit RFID

  • ‎5V SIG pin to A1 pin on Feather

  • GND pin to GND pin on Feather

Speaker

  • Red wire to voltage input on MAX98357A

  • Black wire to ground input on MAX98357A ‎

Install CircuitPython

CircuitPython is a derivative of MicroPython designed to simplify ‎experimentation and education on low-cost microcontrollers. It ‎makes it easier than ever to get prototyping by requiring no upfront ‎desktop software downloads. Simply copy and edit files on ‎the CIRCUITPY drive to iterate.‎

CircuitPython Quickstart

Follow this step-by-step to quickly get CircuitPython running on your ‎board.‎

Download the latest version of CircuitPython for this board via ‎circuitpython.org

Click the link above to download the latest CircuitPython UF2 file.‎

Save it wherever is convenient for you.‎

download_4

board_5

To enter the bootloader, hold down the BOOT/BOOTSELbutton (highlighted in red above), and while continuing to hold it ‎‎(don't let go!), press and release the reset button (highlighted in ‎blue above). Continue to hold the BOOT/BOOTSEL button until the ‎RPI-RP2 drive appears!‎

If the drive does not appear, release all the buttons, and then repeat ‎the process above.‎

You can also start with your board unplugged from USB, press and ‎hold the BOOTSEL button (highlighted in red above), continue to ‎hold it while plugging it into USB, and wait for the drive to appear ‎before releasing the button.‎

A lot of people end up using charge-only USB cables and it is very ‎frustrating! Make sure you have a USB cable you know is good for ‎data sync.‎

You will see a new disk drive appear called RPI-RP2.‎‎ ‎

Drag the adafruit_circuitpython_etc.uf2 file to RPI-RP2.

drive_6

drive_7

The RPI-RP2 drive will disappear, and a new disk drive ‎called CIRCUITPY will appear.‎

That's it, you're done! :)‎

disk_8

Safe Mode

You want to edit your code.py or modify the files on ‎your CIRCUITPY drive but find that you can't. Perhaps your board ‎has gotten into a state where CIRCUITPY is read-only. You may have ‎turned off the CIRCUITPY drive altogether. Whatever the reason, safe ‎mode can help.‎

Safe mode in CircuitPython does not run any user code on startup ‎and disables auto-reload. This means a few things. First, safe ‎mode bypasses any code in boot.py (where you can ‎set CIRCUITPY read-only or turn it off completely). Second, it does ‎not run the code in code.py. And finally, it does not automatically ‎soft-reload when data is written to the CIRCUITPY drive.‎

Therefore, whatever you may have done to put your board in a non-‎interactive state, safe mode gives you the opportunity to correct it ‎without losing all of the data on the CIRCUITPY drive.‎

Entering Safe Mode in CircuitPython 6.x

This section explains entering safe mode on CircuitPython 6.x.‎

section_9

To enter safe mode when using CircuitPython 6.x, plug in your board ‎or hit reset (highlighted in red above). Immediately after the board ‎starts up or resets, it waits 700ms. On some boards, the onboard ‎status LED (highlighted in green above) will turn solid yellow during ‎this time. If you press reset during that 700ms, the board will start up ‎in safe mode. It can be difficult to react to the yellow LED, so you ‎may want to think of it simply as a slow double click of the reset ‎button. (Remember, a fast double click of reset enters the ‎bootloader.)‎

Entering Safe Mode in CircuitPython 7.x

This section explains entering safe mode on CircuitPython 7.x.‎

To enter safe mode when using CircuitPython 7.x, plug in your board ‎or hit reset (highlighted in red above). Immediately after the board ‎starts up or resets, it waits 1000ms. On some boards, the onboard ‎status LED (highlighted in green above) will blink yellow during that ‎time. If you press reset during that 1000ms, the board will start up in ‎safe mode. It can be difficult to react to the yellow LED, so you may ‎want to think of it simply as a slow double click of the reset button. ‎‎(Remember, a fast double click of reset enters the bootloader.)‎

In Safe Mode

Once you've entered safe mode successfully in CircuitPython 6.x, the ‎LED will pulse yellow.‎

If you successfully enter safe mode on CircuitPython 7.x, the LED will ‎intermittently blink yellow three times.‎

If you connect to the serial console, you'll find the following message.‎

Copy Code
Auto-reload is off.
Running in safe mode! Not running saved code.

CircuitPython is in safe mode because you pressed the reset button during boot. Press again to exit safe mode.

Press any key to enter the REPL. Use CTRL-D to reload.

You can now edit the contents of the CIRCUITPY drive. ‎Remember, your code will not run until you press the reset button, or ‎unplug and plug in your board, to get out of safe mode.‎

Flash Resetting UF2‎

If your board ever gets into a really weird state and doesn't even ‎show up as a disk drive when installing CircuitPython, try loading ‎this 'nuke' UF2 which will do a 'deep clean' on your Flash ‎Memory. You will lose all the files on the board, but at least you'll be ‎able to revive it! After loading this UF2, follow the steps above to re-‎install CircuitPython.‎

Download flash erasing "nuke" UF2

Coding the Magic Band Reader

coding_10

Once you've finished setting up your Feather RP2040 with ‎CircuitPython, you can access the code and necessary libraries by ‎downloading the Project Bundle.‎

To do this, click on the Download Project Bundle button in the ‎window below. It will download as a zipped folder.‎

Download Project Bundle‎

Copy Code
# SPDX-FileCopyrightText: 2022 Noe Ruiz for Adafruit Industries
# SPDX-License-Identifier: MIT
# Magic Band Reader with Wiz Kit RFID
import random
import board
import digitalio
import audiobusio
from audiocore import WaveFile
import neopixel
from adafruit_led_animation.animation.chase import Chase
from adafruit_led_animation.animation.solid import Solid
from adafruit_led_animation.color import (
    GREEN,
    BLACK,
)

# Setup button switch
button = digitalio.DigitalInOut(board.A1)
button.switch_to_input(pull=digitalio.Pull.DOWN)

# LRC is word_select, BCLK is bit_clock, DIN is data_pin.
# Feather RP2040
audio = audiobusio.I2SOut(bit_clock=board.D24, word_select=board.D25, data=board.A3)

# Make the neopixel object
pixels = neopixel.NeoPixel(board.D6, 24, brightness=.4)

# Setup the LED animations
chase = Chase(pixels, speed=0.02, color=GREEN, size=4, spacing=24)
solid = Solid(pixels, color=BLACK)

#Fuction for playing audio
def play_wav(name):
    print("playing", name)
    wave_file = open('sounds/' + name + '.wav', 'rb')
    wave = WaveFile(wave_file)
    audio.play(wave)

#List of audio files
sounds = [
    'chime',
    'excellent',
    'foolish',
    'hello',
    'operational',
    'startours'
]
while True:
    print("Waiting for button press to continue!")
    while button.value:
        solid.animate()
    play_wav(random.choice(sounds))
    while audio.playing:
        chase.animate()
    print("Done!")

View on GitHub

Upload the Code and Libraries to the Feather ‎RP2040‎

After downloading the Project Bundle, plug your Feather into the ‎computer's USB port with a known good USB data+power cable. You ‎should see a new flash drive appear in the computer's File Explorer ‎or Finder (depending on your operating system) called CIRCUITPY. ‎Unzip the folder and copy the following items to the Feather ‎RP20402's CIRCUITPY drive. ‎

  • code.py

  • lib directory

  • wav directory

Your Feather RP2040 CIRCUITPY drive should look like this after ‎copying the lib folder, wav folder and the code.py file.‎

drive_11

Training a Tag

training_12

Training a tag on the RFID WIZ couldn't be easier. Simply hold the ‎tag over the red reader board and press the "Train" button.‎

tag_13

You'll see the Status light flash green, and you'll see the green LED ‎by the Relay light up as well. This will stay lit until you remove the ‎tag. The green LED displays the state of the relay and 5v logic output. ‎You'll also hear the click of the relay when it changes state.‎

You can repeat this process with multiple tags. Training up to 20 ‎tags has been tested with stability. Upwards of 40 should be possible ‎but attempt at your own risk

CAD Files

CAD Parts List

STL files for 3D printing are oriented to print "as-is" on FDM style ‎machines. Parts are designed to 3D print without any support ‎material. Original design source may be downloaded using the links ‎below:‎

  • Back Cover.stl

  • Base Bottom Cover.stl

  • Base Frame.stl

  • Base Top Cover.stl

  • Case.stl

  • Face Diffuser.stl

  • Face Mickey Outline.stl

  • Face Mickey.stl

  • Face Outer Ring.stl

  • NeoRing.stl

  • PCB mount.stl

  • Pole.stl

  • RFID-standoff.stl

cad_14

Download STLs.zip

Download CAD source

CAD Assembly

The Feather, amplifier and Wiz Kit board are secured to the PCB ‎mount. The PCB mount is secured to the base bottom cover. The ‎base bottom cover snap fits onto the base frame.‎

assembly_15

The base frame snap fits into the base top cover. The base top cover ‎is secured to the pole. The pole is secured to the case. The NeoPixel ‎strip is press fitted into the NeoRing holder.‎

The NeoRing holder is press fitted into the case. The RFID module is ‎secured to 3D printed standoffs. The 3D printed standoffs are ‎secured to the back cover. The back cover is press fitted onto the ‎case.‎

The face diffuser is press fitted into the case. The mickey face out ‎and out ring are press fitted into the face diffuser. The speaker is ‎attached to the face diffuser with the adhesive.‎

Build Volume

The parts require a 3D printer with a minimum build volume.‎

  • ‎114mm (X) x 114mm (Y) x 50mm (Z)‎

build_16

Faceplate Diffuser

The Face Diffuser.stl part should be printed in translucent filament. ‎This will allow the NeoPixel LEDs to shine through and illuminate ‎the features. ‎

face_17

Design Source Files

The project assembly was designed in Fusion 360. This can be ‎downloaded in different formats like STEP, STL and more. Electronic ‎components like Adafruit's boards, displays, connectors and more ‎can be downloaded from the Adafruit CAD parts GitHub Repo.‎

source_18

Wiring

NeoPixel Strip

Remove the NeoPixel strip from the reel to get it ready for wiring.‎

strip_19

Cut NeoPixel Strip

Cut a section of the strip with 31 NeoPixel LEDs using flush diagonal ‎cutters.‎

Remove the stock cable from the pads of the first NeoPixel LED.‎

Remove the silicone sheathing from the NeoPixel strip section.‎

remove_20

NeoPixel Cable

The 3-pin STEMMA JST cable is used to connect the NeoPixel strip to ‎the Feather.‎

Use the silicone cover ribbon cable to extend the length of wire so ‎the cable is 10in(254mm) long.‎

cable_21

Connect Cable to NeoPixel

Solder the three wires from the STEMMA JST cable to the pads on ‎the first NeoPixel LED.‎

Red wire to 5V pad, black wire to GND pad and white wire to the ‎DATA IN pad.‎

connect_22

Wired NeoPixel Strip

Double check the wires are properly soldered to the pads on the first ‎NeoPixel LED.‎

wired_23

NeoPixel Cable for Feather

The 3-pin JST socket cable will be soldered to the Feather.‎

Cut the three wires from the cable so they're about 2in (50mm) in ‎length. ‎

neopixel_24

RFID Cable for Feather

The stock 2-pin cable is included with the RFID Wiz Kit.‎

Cut the two wires so they're about 2in (50mm) in length.‎

rfid_25

Speaker Wire Extension

The speaker wire will need to be extended in order to reach the ‎amplifier.‎

Use the silicone ribbon cable to increase the length of wire so they're ‎about 10in (254mm) in length.‎

Use pieces of heat shrink tubing to insulate the exposed wire.‎

speaker_26

Wires for Amplifier

Use the silicone ribbon cable to create a 5-pin short cable.‎

Measure the length of wire to about 2in(50mm) long.‎

Solder the wires to the pins on the amplifier. ‎

wires_27

Cables for Feather

Get the cables for the Feather ready to solder.‎

cables_28

Connect NeoPixel Cable to Feather

Solder the red wire to the USB pin on Feather. Solder the black wire ‎to a ground pin on the Feather. Solder the white wire to D6 (GP08) ‎pin.‎

redwire_29

Connect Amplifier to Feather

Make the following connections to the Feather.‎

  • LRC to 25 pin on Feather

  • BCLK to 24 pin on Feather

  • DIN to A3 pin on Feather

  • VIN to 3V pin on Feather

  • GND to GND pin on Feather

connect_30

Connect RFID cable to Feather

Solder the red wire to pin A1 on Feather. Solder the black wire to the ‎ground pin on Feather.‎

solder_31

Soldered Feather

Take a moment to check all of the wires have been properly soldered ‎to the Feather.‎

wires_32

Assembly

Install NeoPixel Strip to Holder

Insert the NeoPixel strip into the 3D printed ring holder.‎

Press the cable through the slit on the inside of the holder.‎

press_33

NeoPixel Holder

The NeoPixel strip is held in place with the cable going out through ‎the center of the holder.‎

holder_34

Hardware for PCB Mount

Use 4x 6mm long M-F hex standoffs for the PCB mount. ‎

hardware_35

Install Standoffs to PCB Mount

Use a M3 screw tap to create threads in the four built-in standoffs on ‎the PCB mount.‎

Insert and fasten the standoffs into the built-in standoffs.‎

Reference the photo for correct orientation.‎

install_36

M3 Standoffs for PCB Mount

Double check the M3 standoffs have been properly installed to the ‎built-in standoffs in the PCB mount.‎

standoffs_37

Hardware for Feather

Use the following hardware to attach the Feather to the PCB mount.‎

  • ‎4x 10mm long M2.5 screws

  • ‎8x M2.5 hex nuts‎

hardware_38

Install Screws to Feather

Insert the M2.5 screws through the mounting holes on the Feather.‎

Fasten the M2.5 hex nuts onto the threads of the screws to secure ‎them in place.‎

fasten_39

Install Feather to PCB mount

Orient the Feather with the USB-C port facing the correct direction.‎

Insert the threads of the screws through the mounting holes on the ‎PCB mount.‎

threads_40

Secure Feather to PCB Mount

Insert and fasten the M2.5 hex nuts to secure the Feather to the PCB ‎mount.‎

secure_41

Hardware for Amplifier

Use 2x M2.5 x 8mm long screws and 2x M2.5 hex nuts for securing ‎the amplifier to the PCB mount.‎

amplifier_42

Secure Amplifier to PCB mount

Place the amplifier over the mounting holes.‎

Insert and fasten M2.5 screws through the mounting holes.‎

Use the M2.5 hex nuts to secure the amplifier to the PCB mount.‎

mount_43

Assembled PCB mount

Double check the PCB mount has been properly assembled.‎

check_44

Hardware for RFID board

Use 4x M3 x 4mm long screws to secure the RFID board to the PCB ‎mount.‎

screws_45

Install RFID board to PCB mount

Orient the RFID board with the PCB mount and place it over ‎standoffs with the mounting holes lined up.‎

orient_46

Secure RFID to PCB mount

Insert and fasten the M3 screws to secure the RFID board to the PCB ‎mount.‎

insert_47

Connect Cable to RFID board

Plug in the 2-pin cable from the Feather to the 2-pin JST port on the ‎RFID board.‎

plug_48

Hardware for RFID module ‎

Use 4x M3x6mm metal screws to secure the RFID module to the ‎back cover.‎

module_49

Secure Standoffs to Cover

Insert and fasten the M3 screws to the back cover to secure the two ‎‎3D printed standoffs.‎

print_50

Secure RFID module to Standoffs

Place the RFID module over the standoffs and line up the mounting ‎holes.‎

Insert and fasten two M3 x 6mm long metal screws to secure the ‎RFID module.‎

fasten_51

Secured RFID Module

Double check the RFID module is properly secured to the back cover.‎

doublecheck_52

Attach Pole and Cover

Use two M3 x 6mm metal screws to secure the 3D printed pole to ‎the case top cover.‎

pole_54

pole_53

Secure Pole to Case

Use two M3 x 10mm long metal screws to secure the 3D printed hole ‎to the case.‎

Line up the pole’s mounting tabs with the mounting holes on the ‎case.‎

Press fit the pole into the cavity on the case.‎

fit_55

fit_56

Secure Case to Pole

Insert and fasten the two M3 x 10mm long metal screws through the ‎mounting holes in the case.‎

Insert and fasten the two M3 hex nuts to secure the case to the pole.‎

case_56

case_57

Assembled Case and Pole

Take a moment to check the three parts are properly secured ‎together.‎

properly_58

Mickey Face Plate

Get the various pieces ready to install together to make the Mickey ‎face plate.‎

plate_59

Assemble Face Plate

Press fit the various pieces together to assemble the Mickey face ‎plate.‎

together_60

together_61

Install Face Plate

The Mickey face plate is press fitted into the case.‎

Press the edges of face plate into the recess of the case so it's flush ‎with the top surface.‎

install_61

install_62

Install Speaker

Peel off the protective backing from the front of the speaker to ‎reveal the sticky adhesive.‎

Place the speaker over the three holes on the face plate.‎

Press the speaker onto the surface of the face plate to secure it in ‎place.‎

speaker_63

Install NeoPixel Holder

Get the NeoPixel holder ready to install into the case.‎

Begin installing the holder into the case.‎

holder_64

holder_65

Secured NeoPixel Holder

Press the NeoPixel holder into the case until it sits flush.‎

Insert and thread the various cables through the pole and out ‎through the other end.‎

secure_66

Installing RFID module

Insert the ribbon cable from the RFID module through the pole and ‎out the other end.‎

ribbon_67

Install Back Cover

Orient the back cover with the case.‎

Press fit the back cover into the case. ‎

back_68

Assembled Case

Double check the back cover is secured to the case.‎

case_69

Install Base Frame

The base frame is press fitted onto the pole cover.‎

Orient the base frame with the case so the side with the cut outs are ‎facing the up with the case cover.‎

baseframe_70

baseframe_71

Connect RFID Cable

Plug in the ribbon cable from the RFID module to the Wiz Kit dev ‎board.‎

plug_72

Connect NeoPixel to Feather

Plug in the 3-pin JST cable from the NeoPixel strip to the ‎accompanying cable on the Feather.‎

feather_73

Speaker Wire Connect

Insert the two wires from the speaker to the screw block terminal on ‎the amplifier.‎

Use a screwdriver to secure the speaker wires.‎

wire_74

Hardware for Base Bottom Cover

Use 4x M3 x 10mm long metal screws to secure the PCB mount to ‎the base bottom cover.‎

hardware_75

Installing PCB mount

Orient the PCB mount with the base bottom cover so the mounting ‎holes are lined up with the standoffs.‎

mount_76

Secure PCB mount

Insert and fasten the M3 screws to secure the PCB mount to the ‎base bottom cover.‎

bottom_77

PCB mount

Double check the PCB mount is properly secured to the base ‎bottom cover.‎

pcb_78

Install Base Bottom Cover

Carefully fit the excess wiring into the pole and base frame.‎

cover_79

Secured Base Bottom Cover

Press fit the base bottom cover into the base frame.‎

The USB port and DC jack should be oriented with the cutouts in the ‎base frame.‎

secured_80

Final Build

Congratulations on your build!‎

final_81

Use

Train your bands with the RFID Wiz board per the instructions on this ‎guide web page.‎

Once your magic band has been trained with the Wiz Kit board, ‎bring the magic band close to the Mickey face plate to trigger the ‎NeoPixels and sound effect.‎

band_82

 

 

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