bfpad submission

hackpads/bfpad/README.md

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+# bfpad
+
+bfpad is an 8-key macropad with an additional 0.91 inch 128x32 OLED display and an EC11 rotary encoder. there are 3 reverse-mount neopixels to light under the keys, as well as 8 under the board. with limited keys on the pad, i figured interpreting a limited-character and simple language directly on the microcontroller would be a perfect fit. the goal is to write firmware to allow you to write and run [bf](https://en.wikipedia.org/wiki/Brainfuck) code directly on the keyboard. hopefully.
+![bfpad](assets/bfpad.png)
+
+## case
+
+i want to leave the PCB exposed, so i made a stand that can be attached to the PCB via m3 screws and held in place by hex nuts.
+![case](assets/case.png)
+
+## schematic & pcb
+
+the 8 keys (and secret 9th rotary encoder key) are addressed via a 3x3 key matrix, using only 6 pins of the RP2040.
+![schematic](assets/schematic.png)
+this is the third iteration of the PCB.
+![pcb](assets/pcb.png)
+
+## BOM
+
+-   Seeed XIAO RP2040 (through-hole)
+-   8x kailh choc v2 switches (and corresponding keycaps! any color)
+-   9x 1N4148 DO-35 Diodes
+-   1x EC11 rotary encoder
+-   1x 0.91 inch OLED SSD1306 display
+-   8x SK6812 MINI LEDs
+-   3x SK6812 MINI-E reverse mount LEDs
+-   3x M3 screws
+-   9x M3 hex nuts
+-   1x bottom stand

hackpads/bfpad/firmware/kmk/firmware.py

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+import board
+import busio
+from kmk.kmk_keyboard import KMKKeyboard
+from kmk.scanners import DiodeOrientation
+from kmk.keys import KC
+from kmk.modules.encoder import EncoderHandler
+from kmk.extensions.display import Display, TextEntry, ImageEntry
+from kmk.extensions.display.ssd1306 import SSD1306
+from kmk.extensions.RGB import RGB
+
+keyboard = KMKKeyboard()
+
+encoder = EncoderHandler()
+encoder_handler.pins = ((board.SCK, board.RX, None,),)
+encoder_handler.map = [((KC.VOLD, KC.VOLU, KC.NO,),)]
+keyboard.modules.append(encoder)
+
+i2c_bus = busio.I2C(board.SCL, board.SDA)
+display_driver = SSD1306(i2c=i2c_bus)
+display = Display(display=display_driver)
+display.entries = [
+	ImageEntry(image="pfptiny.bmp", x=0, y=0),
+	TextEntry(text="bfpad", x=40, y=16, y_anchor="M")
+]
+keyboard.extensions.append(display)
+
+rgb = RGB(pixel_pin = board.TX, num_pixels=11)
+keyboard.extensions.append(rgb)
+
+keyboard.col_pins = (board.MOSI, board.A0, board.MISO)
+keyboard.row_pins = (board.A3, board.A2, board.A1)
+keyboard.diode_orientation = DiodeOrientation.COL2ROW
+keyboard.keymap = [
+    [[KC.RABK, KC.DOT, KC.COMMA], [KC.LABK, KC.PLUS, KC.LBRACKET], [KC.MINUS, KC.MUTE, KC.RBRACKET]]
+]
+
+if __name__ == '__main__':
+    keyboard.go()

hackpads/bfpad/pcb/.gitignore

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+cheyao macropad main PCB-third_party_neopixel.petty
+KiCad-SSD1306-0.91-OLED-4pin-128x32.pretty-master
+OPL_Kicad_Library-master
+fp-info-cache
+fp-lib-table
+sym-lib-table
+~hackpad.kicad_sch.lck
+~hackpad.kicad_pcb.lck