Logical pinout · physical placement not verified

VIN
Board power input. Adafruit says to power it from the same voltage as the microcontroller logic level.
Type · PowerVoltage · 3V to 5V input, regulated down for the 3V TCA8418 chip, per Adafruit Learn.
3Vo
3.3V output from the onboard regulator.
Type · PowerVoltage · 3.3V output, up to 100mA per Adafruit Learn.
GND
Common ground for power and logic.
Type · GroundVoltage · 0V
SCL
I2C clock line to the host microcontroller, level shifted, with 10k pull-up.
Type · I2CVoltage · 3V to 5V logic supported per Adafruit Learn.
SDA
I2C data line to the host microcontroller, level shifted, with 10k pull-up.
Type · I2CVoltage · 3V to 5V logic supported per Adafruit Learn.
STEMMA QT
STEMMA QT/Qwiic I2C connector for compatible boards and accessories.
Type · UnknownVoltage · I2C connector follows board power/logic level.
C0-C9
GPIO or keypad matrix column pins. Column number corresponds with pin number.
Type · GPIO
R0-R7
GPIO or keypad matrix row pins. Row number corresponds with pin number.
Type · GPIO
INT
Open-drain active-low interrupt output.
Type · Signal
RST
Active-low reset input.
Type · Control
Power LED
Green onboard power LED labelled on.
Type · Unknown

Pin	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	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.
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	Unknown	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	Signal	Open-drain active-low interrupt output.
RST	Control	Active-low reset input.
Power LED	Unknown	Green onboard power LED labelled on.

Logical pinout · physical placement not verified

Pin details

11 connections

VIN
Board power input. Adafruit says to power it from the same voltage as the microcontroller logic level.
PowerVoltage · 3V to 5V input, regulated down for the 3V TCA8418 chip, per Adafruit Learn.
3Vo
3.3V output from the onboard regulator.
PowerVoltage · 3.3V output, up to 100mA per Adafruit Learn.
GND
Common ground for power and logic.
GroundVoltage · 0V
SCL
I2C clock line to the host microcontroller, level shifted, with 10k pull-up.
I2CVoltage · 3V to 5V logic supported per Adafruit Learn.
SDA
I2C data line to the host microcontroller, level shifted, with 10k pull-up.
I2CVoltage · 3V to 5V logic supported per Adafruit Learn.
STEMMA QT
STEMMA QT/Qwiic I2C connector for compatible boards and accessories.
UnknownVoltage · I2C connector follows board power/logic level.
C0-C9
GPIO or keypad matrix column pins. Column number corresponds with pin number.
GPIO
R0-R7
GPIO or keypad matrix row pins. Row number corresponds with pin number.
GPIO
INT
Open-drain active-low interrupt output.
Signal
RST
Active-low reset input.
Control
Power LED
Green onboard power LED labelled on.
Unknown

Start wiring

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.

Keypads

36 other options

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.

View all 36

Related groups

4 groups

Buttons & switches

Most 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

Encoders

Bare 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 · 28 parts

Touch

MPR121, 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

3D printing

DFRobot 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