Adafruit MACROPAD RP2040 Bare Bones - 3x4 Keys + Encoder + OLED

RP2040-based 3×4 macropad with 12 Cherry MX-compatible switch sockets, 12 per-key NeoPixels, rotary encoder, 128×64 SH1106 OLED, 8 MB flash, buzzer, STEMMA QT, and USB-C HID/MIDI. Ships bare PCB; switches and keycaps sold separately.

KEY1-KEY12
Cherry-MX compatible key switch sockets in a 3x4 grid; each socket is individually tied to GPIO, not matrix-wired. Pressing a key grounds the pin, so use pull-ups.
Type · inputVoltage · 3.3V RP2040 GPIO input domain.
Rotary encoder / BOOT
Rotary encoder with push switch used as BOOT button and available as user input.
Type · inputVoltage · 3.3V RP2040 GPIO input domain.
STEMMA QT
Qwiic-compatible STEMMA QT I2C connector for sensors and breakouts.
Type · i2c-connectorVoltage · 3.3V I2C; Adafruit states SCL and SDA have 10k pull-ups and are 3.3V when quiescent.
SCL
I2C clock on the STEMMA QT connector, usable as board.SCL / board.STEMMA_I2C().
Type · i2cVoltage · 3.3V with 10k pull-up per Adafruit Learn.
SDA
I2C data on the STEMMA QT connector, usable as board.SDA / board.STEMMA_I2C().

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Pin	Type	Function	Voltage
KEY1-KEY12	input	Cherry-MX compatible key switch sockets in a 3x4 grid; each socket is individually tied to GPIO, not matrix-wired. Pressing a key grounds the pin, so use pull-ups.	3.3V RP2040 GPIO input domain.
Rotary encoder / BOOT	input	Rotary encoder with push switch used as BOOT button and available as user input.	3.3V RP2040 GPIO input domain.
STEMMA QT	i2c-connector	Qwiic-compatible STEMMA QT I2C connector for sensors and breakouts.	3.3V I2C; Adafruit states SCL and SDA have 10k pull-ups and are 3.3V when quiescent.
SCL	i2c	I2C clock on the STEMMA QT connector, usable as board.SCL / board.STEMMA_I2C().	3.3V with 10k pull-up per Adafruit Learn.
SDA	i2c	I2C data on the STEMMA QT connector, usable as board.SDA / board.STEMMA_I2C().	3.3V with 10k pull-up per Adafruit Learn.
USB-C	power-data	USB Type-C connector for power and data/programming.	USB power input to board.
OLED	display	On-board OLED display driven from the RP2040 board circuitry.	On-board display interface.
NEOPIXEL	indicator	3x4 grid of reverse-mount RGB NeoPixel LEDs above the key switch sockets, available as board.NEOPIXEL / PIN_NEOPIXEL.	On-board 3.3V controlled LEDs.
Red LED	indicator	On-board red LED available as board.LED / PIN_LED.	On-board 3.3V controlled LED.
Reset	control	Reset button; tap once to reset, combine with boot button to enter bootloader.	Board reset control.
Speaker	audio	On-board 8mm speaker/buzzer driven by board circuitry.	On-board audio output.
QSPI Flash	memory	On-board 8MB QSPI flash used by CircuitPython as native read-only interpreter storage with writable disk drive exposed separately.	On-board QSPI interface.

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