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

Want to add more hardware? No worries - a STEMMA QT port on the side lets you connect any I2C add-on peripherals from the massive STEMMA QT / Qwiic family of plugin boards.Please note, this board does have basic QMK support! However, it's very early and not everything is…

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().

Start wiring

SPI · I2C · 3.3V RP2040 GPIO input domain. · 3.3V I2C; Adafruit states SCL and SDA have 10k pull-ups and are 3.3V when quiescent.

Confirm the data interface matches your host board.

Module pins: SCL, SDA. Schematik maps them to your board in the app.

Related groups

4 groups

Displays

Character LCDs, SPI TFTs, e-paper modules and larger capacitive-touch TFT panels solve different display jobs. Treat display class, interface, controller, resolution, touch, refresh behaviour, storage, voltage and mounting as separate swap checks.

Displays · TFT & LCD displays · 35 parts

Connectors

Sort passive connector adapters from Qwiic boards, LCD modules and microSD card adapters before assuming anything with the right plug will substitute safely.

Connectors & cables · Connectors · 28 parts

Air quality

Choose between MQ gas sensors, VOC/eCO2 indoor-air sensors, true CO2 modules and particulate sensors without treating every air-quality breakout as the same detector.

Sensors · Gas & air-quality sensors · 31 parts

MCUs and boards

ESP32, Arduino Uno, Raspberry Pi Pico, and compatible add-on boards for running builds.

Boards · Microcontroller boards · 25 parts

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.

Pinout

Start wiring

Displays

Connectors

Air quality

MCUs and boards