Add MIDIpad (officially stylized as mpad)

hackpads/midipad/README.md

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+# MIDIpad
+
+An independent venture into MIDI controllers.
+
+## ✨ What 
+
+In its current state, MIDIpad is as the name implies: a portable 12-key MIDI controller
+with an admittedly non-standard key layout (order: left to right, top to bottom). There
+are three knobs for interfacing with a Digital Audio Workstation (DAW), and when pressed,
+for switching between three MIDI channels.
+
+The future vision is to make a portable and minimal looper, able to load samples or
+plugins from an SD card, while still functioning as a MIDI device.
+
+## ❓ Why
+
+Although I own a MIDI piano, I find the linear layout to be less intuitive for drumming.
+I took great inspiration by Launchpads—I don't own one, but I value the grid-based
+interface. However, although flashy, I don't need the full 64 keys that Launchpads offer,
+so that became my initial motivation for this device.
+
+## 📝 Bill of Materials
+
+- 128x32 OLED Display
+- 3 EC11 Rotary encoders
+- 12 Keys
+- 3 SK6812 LEDs
+
+## 📸 Pictures
+
+![PCB view of midipad in KiCad](https://github.com/user-attachments/assets/e291a786-e8bb-4892-b345-8339b5e39b9f)
+
+![3-D view of the entire case](https://github.com/user-attachments/assets/a71cd22a-a47e-4b95-8770-f265110977b5)
+
+^ Yes I'm missing a few models. Yes this is a screenshot of Onshape.
+
+![3-D view of the PCB](https://github.com/user-attachments/assets/93470769-9958-4fc9-a9b4-fbe5257d9d89)
+
+^ 3D render in KiCad
+
+![Half of the schematic view of midipad](https://github.com/user-attachments/assets/3db30f81-78f0-42c3-90d1-1a9fae4ef9c9)
+
+![The other half of the schematic view of midipad](https://github.com/user-attachments/assets/7542dc9c-3ca8-418c-934b-b8694c95423f)

hackpads/midipad/cad/README.md

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+**Disclaimer:** The rotary encoder model had to be scaled, so KiCad excluded them for being "mechanically unreliable".

hackpads/midipad/firmware/main.py

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+import board
+
+from kmk.kmk_keyboard import KMKKeyboard
+from kmk.keys import KC
+from kmk.scanners import DiodeOrientation
+
+keyboard = KMKKeyboard()
+
+macros = Macros()
+keyboard.modules.append(macros)
+
+keyboard.col_pins = (board.GP26, board.GP27, board.GP28, board.GP29)
+keyboard.row_pins = (board.GP1, board.GP2, board.GP4)
+keyboard.diode_orientation = DiodeOrientation.COL2ROW
+
+# TODO: rotary encoder pins
+
+keyboard.keymap = [
+    # WIP: Will output MIDI instead of typing
+]
+
+if __name__ == '__main__':
+    keyboard.go()