Logical pinout · physical placement not verified

COM
Common switch return for the 1x4 membrane keypad; Adafruit states the keypad has four buttons, each key has its own wire line, and includes a 5-pin header strip.
Type · Signal
KEY1
Individual normally-open switch line for one keypad button; treat as an everyday switch/digital input per Adafruit product description.
Type · Signal
KEY2
Individual normally-open switch line for one keypad button; treat as an everyday switch/digital input per Adafruit product description.
Type · Signal
KEY3
Individual normally-open switch line for one keypad button; treat as an everyday switch/digital input per Adafruit product description.
Type · Signal
KEY4
Individual normally-open switch line for one keypad button; treat as an everyday switch/digital input per Adafruit product description.
Type · Signal

Pin	Type	Function
COM	Signal	Common switch return for the 1x4 membrane keypad; Adafruit states the keypad has four buttons, each key has its own wire line, and includes a 5-pin header strip.
KEY1	Signal	Individual normally-open switch line for one keypad button; treat as an everyday switch/digital input per Adafruit product description.
KEY2	Signal	Individual normally-open switch line for one keypad button; treat as an everyday switch/digital input per Adafruit product description.
KEY3	Signal	Individual normally-open switch line for one keypad button; treat as an everyday switch/digital input per Adafruit product description.
KEY4	Signal	Individual normally-open switch line for one keypad button; treat as an everyday switch/digital input per Adafruit product description.

Logical pinout · physical placement not verified

Pin details

5 connections

COM
Common switch return for the 1x4 membrane keypad; Adafruit states the keypad has four buttons, each key has its own wire line, and includes a 5-pin header strip.
Signal
KEY1
Individual normally-open switch line for one keypad button; treat as an everyday switch/digital input per Adafruit product description.
Signal
KEY2
Individual normally-open switch line for one keypad button; treat as an everyday switch/digital input per Adafruit product description.
Signal
KEY3
Individual normally-open switch line for one keypad button; treat as an everyday switch/digital input per Adafruit product description.
Signal
KEY4
Individual normally-open switch line for one keypad button; treat as an everyday switch/digital input per Adafruit product description.
Signal

Start wiring

I2C · Analog · USB · 3.3 – 5 V · Breakout

Module pins: COM, KEY1, KEY2, KEY3, KEY4. 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

Pinout