adding code and midi files

Adding code and midi files for the toy robot xylophone project.

Toy_Robot_Xylophone/code.py

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+# SPDX-FileCopyrightText: 2025 Liz Clark for Adafruit Industries
+#
+# SPDX-License-Identifier: MIT
+
+import os
+from random import randint
+import board
+import usb_midi
+import keypad
+from adafruit_mcp230xx.mcp23017 import MCP23017
+import adafruit_midi
+from adafruit_midi.note_on import NoteOn
+from adafruit_midi.note_off import NoteOff
+import adafruit_midi_parser
+
+# music_box plays back MIDI files on CP drive
+# set to false for live MIDI over USB control
+music_box = True
+# define the notes that correspond to each solenoid
+notes = [48, 50, 52, 53, 55, 57, 59, 60]
+
+key = keypad.Keys((board.BUTTON,), value_when_pressed=False, pull=True)
+
+i2c = board.STEMMA_I2C()
+mcp = MCP23017(i2c)
+noids = []
+for i in range(8):
+    noid = mcp.get_pin(i)
+    noid.switch_to_output(value=False)
+    noids.append(noid)
+# pylint: disable=used-before-assignment, unused-argument, global-statement
+if not music_box:
+    midi = adafruit_midi.MIDI(
+        midi_in=usb_midi.ports[0], in_channel=0, midi_out=usb_midi.ports[1], out_channel=0
+    )
+else:
+    midi_files = []
+    for filename in os.listdir('/'):
+        if filename.lower().endswith('.mid') and not filename.startswith('.'):
+            midi_files.append("/"+filename)
+    print(midi_files)
+
+    class Custom_Player(adafruit_midi_parser.MIDIPlayer):
+        def on_note_on(self, note, velocity, channel):  # noqa: PLR6301
+            for z in range(len(notes)):
+                if notes[z] == note:
+                    print(f"Playing note: {note}")
+                    noids[z].value = True
+
+        def on_note_off(self, note, velocity, channel):  # noqa: PLR6301
+            for z in range(len(notes)):
+                if notes[z] == note:
+                    noids[z].value = False
+
+        def on_end_of_track(self, track):  # noqa: PLR6301
+            print(f"End of track {track}")
+            for z in range(8):
+                noids[z].value = False
+
+        def on_playback_complete(self):  # noqa: PLR6301
+            global now_playing
+            now_playing = False
+            for z in range(8):
+                noids[z].value = False
+    parser = adafruit_midi_parser.MIDIParser()
+    parser.parse(midi_files[randint(0, (len(midi_files) - 1))])
+    player = Custom_Player(parser)
+    new_file = False
+    now_playing = False
+
+while True:
+    if music_box:
+        event = key.events.get()
+        if event:
+            if event.pressed:
+                now_playing = not now_playing
+                if now_playing:
+                    new_file = True
+        if new_file:
+            parser.parse(midi_files[randint(0, (len(midi_files) - 1))])
+            print(f"Successfully parsed! Found {len(parser.events)} events.")
+            print(f"BPM: {parser.bpm:.1f}")
+            print(f"Note Count: {parser.note_count}")
+            new_file = False
+        if now_playing:
+            player.play(loop=False)
+
+    else:
+        msg = midi.receive()
+        if msg is not None:
+            for i in range(8):
+                noid_output = noids[i]
+                notes_played = notes[i]
+                if isinstance(msg, NoteOn) and msg.note == notes_played:
+                    noid_output.value = True
+                elif isinstance(msg, NoteOff) and msg.note == notes_played:
+                    noid_output.value = False