Board power input. Adafruit says to power it from the same voltage as the microcontroller logic level.
3.3V output from the onboard regulator.
Common ground for power and logic.
I2C clock line to the host microcontroller, level shifted, with 10k pull-up.
I2C data line to the host microcontroller, level shifted, with 10k pull-up.
STEMMA QT/Qwiic I2C connector for compatible boards and accessories.
GPIO or keypad matrix column pins. Column number corresponds with pin number.
GPIO or keypad matrix row pins. Row number corresponds with pin number.
Open-drain active-low interrupt output.
Active-low reset input.
Green onboard power LED labelled on.
| Pin | Position | Type | Function | Voltage |
|---|---|---|---|---|
| VIN | power | Board power input. Adafruit says to power it from the same voltage as the microcontroller logic level. | 3V to 5V input, regulated down for the 3V TCA8418 chip, per Adafruit Learn. | |
| 3Vo | power output | 3.3V output from the onboard regulator. | 3.3V output, up to 100mA per Adafruit Learn. | |
| GND | ground | Common ground for power and logic. | 0V | |
| SCL | i2c | I2C clock line to the host microcontroller, level shifted, with 10k pull-up. | 3V to 5V logic supported per Adafruit Learn. |
I2C · Analog · USB · 3.3 – 5 V · Breakout
Confirm the data interface matches your host board.
Module pins: VIN, GND, SCL, SDA, C0-C9, R0-R7. Schematik maps them to your board in the app.
Matrix keypads, analog ADKey boards, I2C keypad controllers, joysticks, and finished USB-HID keyboards are all here. Pin budget and simultaneous-press requirements are the splits that matter.
4x4 Matrix Keypad visual preview4x4 Matrix Keypad
Adafruit PC Joystick to seesaw I2C Adapter visual previewAdafruit PC Joystick to seesaw I2C Adapter
Adafruit Trellis Monochrome Driver PCB for 4x4 Keypad & 3mm LEDs visual previewAdafruit Trellis Monochrome Driver PCB for 4x4 Keypad & 3mm LEDs
Adafruit UNTZtrument 16x8 Grid Controller visual previewAdafruit UNTZtrument 16x8 Grid Controller
Bus Pirate v3.6 Universal Serial Interface visual previewBus Pirate v3.6 Universal Serial Interface
CardKB2 Keyboard Unit (ESP32-C61) visual previewCardKB2 Keyboard Unit (ESP32-C61)
Fermion: ADKey Board -10 Keys (Breakout) visual previewFermion: ADKey Board -10 Keys (Breakout)
FS-GT3B visual previewFS-GT3B
Full Size Panel Mount Keyboard with Trackpad visual previewFull Size Panel Mount Keyboard with Trackpad
Gravity: Analog ADKeyboard Module V2 visual previewGravity: Analog ADKeyboard Module V2
Joystick visual previewJoystick
Joystick Module (.NET Gadgeteer Compatible) visual previewJoystick Module (.NET Gadgeteer Compatible)
SparkFun Rotary Switch Potentiometer Breakout visual preview
Potentiometer Wiper/Plunger - 14mm visual preview
Momentary Pushbutton Switch visual preview
12mm Domed Push Button Pack visual previewMost parts here are simple contacts: press or release, open or closed. A few outliers — rotary switch potentiometer breakouts, NeoPixel potentiometers, wiper plungers — carry separate wiring requirements worth checking before you order.
Input & controls · Buttons & switches · 106 parts
Adafruit ANO Rotary Navigation Encoder to I2C STEMMA QT Adapter visual preview
Adafruit DS1841 I2C Digital 10K Potentiometer Breakout visual preview
Adafruit DS3502 I2C Digital 10K Potentiometer Breakout visual preview
ANO Directional Navigation and Scroll Wheel Rotary Encoder visual previewBare EC11 quadrature encoders, I2C navigation encoders, absolute AS5600 and 8421 encoders, slide and ribbon potentiometers, and digital I2C pots — covering most ways to read angular or linear position.
Input & controls · Rotary encoders · 27 parts
Adafruit 12-Key Capacitive Touch Sensor Breakout - MPR121 [STEMMA QT] visual preview
BOSON: Capacitive Touch Sensor i8 visual preview
CAP1188 - 8-Key Capacitive Touch Sensor Breakout - I2C or SPI visual preview
Capacitive Touch Kit for Arduino visual previewMPR121, CAP1188, CAP1203 Qwiic slider and AT42QT breakouts are sensor ICs for electrodes you wire yourself. Simple single-pad modules like the TTP223B give you one digital output with no bus required.
Input & controls · Touch sensors · 14 parts
1.75mm PLA (1kg) - Black visual preview
1.75mm PLA (1kg) - Gold visual preview
1.75mm PLA (1kg) - Green visual preview
1.75mm PLA (1kg) - Natural visual previewDFRobot 1.75 mm PLA in 1 kg spools makes up the bulk of the group, in over 15 colors. Specialty options include PVA in both diameters, NinjaFlex flexible filament, Proto-Pasta conductive PLA, and wood-fill. OverLord printer spares and OverLord printers round out the hardware side.
Tools & prototyping · 3D printing · 53 parts
| SDA | i2c | I2C data line to the host microcontroller, level shifted, with 10k pull-up. | 3V to 5V logic supported per Adafruit Learn. |
| STEMMA QT | connector | STEMMA QT/Qwiic I2C connector for compatible boards and accessories. | I2C connector follows board power/logic level. |
| C0-C9 | gpio | GPIO or keypad matrix column pins. Column number corresponds with pin number. |
| R0-R7 | gpio | GPIO or keypad matrix row pins. Row number corresponds with pin number. |
| INT | interrupt | Open-drain active-low interrupt output. |
| RST | reset | Active-low reset input. |
| Power LED | indicator | Green onboard power LED labelled on. |
