Shambhavi's MIDI hackpad

hackpads/shambhavi's_macropad/README.md

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+# midi macropad :)
+the (push switch) keys play the (musical) key's tonic triad notes; <br> turning the rotary encoder changes the key of the notes; <br> the OLED display shows what key you're in.<br><br>i need all the parts soldered, thank you!
+
+
+### inspiration 
+i wanted to be able to make music more intuitively and easily than simply using a traditional mouse and keyboard setup.
+
+### hardest challenges
+- learning to use fusion360 😧
+- learning what all these new words meant (use a matrix? configure the keyboard?? compile the code?!)
+
+### fun facts!
+when i get the hackpad, i'll probably try to code the OLED display and rotary encoder to act as a metronome :D
+
+# BOM:
+- 1x Seeed XIAO RP2040 through-hole (preferably black, otherwise green)
+- 1x 0.91 inch OLED Display
+- 3x MX-Style switches
+- 1x EC11 Rotary Encoder
+- 1x PCB
+- 3x Blank DSA keycaps
+- 1x case (preferably lime green! otherwise any green or black)

hackpads/shambhavi's_macropad/firmware/main.py

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+from kmk.kmk_keyboard import KMKKeyboard
+from kmk.keys import KC
+from kmk.scanners import DiodeOrientation
+from kmk.extensions.rotary_encoder import RotaryEncoder
+
+from kmk.extensions.oled import Oled, OledDisplayMode
+from kmk.modules.midi import MidiKeys
+
+keyboard = KMKKeyboard()
+keyboard.modules.append(MidiKeys())
+
+
+key_change = 0
+note_names = ['C', 'C#', 'D', 'D#', 'E', 'F', 'F#', 'G', 'G#', 'A', 'A#', 'B']
+
+keyboard.row_pins = (11,10,9) #push switches / keys
+keyboard.diode_orientation = DiodeOrientation.COL2ROW
+
+
+def calculate_keymap():
+    global key_change
+    return[
+        [KC.MIDI_NOTE(60 + key_change,127)], #c
+        [KC.MIDI_NOTE(64 + key_change,127)], #e
+        [KC.MIDI_NOTE(67 + key_change,127)], #g
+    ]
+
+
+keyboard.keymap = calculate_keymap() #original
+
+def update_key_change(x):
+    global key_change
+    key_change += x
+    key_change = max(min(key_change, 24), -24)
+    keyboard.keymap = calculate_keymap()
+
+def midi_note_to_name(midi_note):
+    octave = (midi_note // 12) - 1
+    note = note_names[midi_note % 12]
+    return f"{note}{octave}"
+
+encoder = RotaryEncoder(
+    pins=(1,8),  
+    up=lambda: update_key_change(1),
+    down=lambda: update_key_change(-1)
+)
+keyboard.extensions.append(encoder)
+
+def oled_update(oled):
+    oled.clear()
+    note1 = midi_note_to_name(60 + key_change)
+    note2 = midi_note_to_name(64 + key_change)
+    note3 = midi_note_to_name(67 + key_change)
+    oled.write_line(f"key: {note1}")
+    oled.write_line(f"notes: {note1}, {note2}, {note3}")
+
+oled_ext = Oled(
+    OledDisplayMode.LAYER,
+    flip=False,
+    sda=5,
+    scl=6,
+    i2c_addr=0x3C
+)
+
+oled_ext.on_oled_update = oled_update
+keyboard.extensions.append(oled_ext)
+
+if __name__ == '__main__':
+    keyboard.go()