Adafruit
3x4 Phone-style Matrix Keypad
This phone-style 3×4 matrix keypad features 12 buttons (0–9, *, #) with telephone-layout lettering printed on the keys. It uses a matrix scanning arrangement...
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This phone-style 3×4 matrix keypad features 12 buttons (0–9, *, #) with telephone-layout lettering printed on the keys. It uses a matrix scanning arrangement requiring only 7 microcontroller pins (3 columns + 4 rows) to read all 12 keys.
The keypad comes with 7 or 8 header pins pre-soldered for easy breadboard use. Starting from the left, the first three pins are columns, followed by the four row pins. If an 8th pin is present, it is unused and can be left disconnected.
Key Features
- Phone-Style Layout – Letters and numbers printed on keys, just like a telephone
- 12-Key Matrix – Standard 3×4 arrangement (0–9, *, #)
- Pre-Soldered Headers – Ready for breadboard use out of the box
- Sturdy Plastic Construction – Rigid body with durable plastic buttons
- 7-Pin Interface – Matrix scanning with 3 columns + 4 rows
Pin Order
From left to right: COL1, COL2, COL3, ROW1, ROW2, ROW3, ROW4. An 8th pin (if present) is unused.
Ideal For
- Telephone and dialler projects
- Security keypads and access control
- Menu navigation interfaces
- Arduino and microcontroller input
Package Contents
- 1× 3×4 phone-style matrix keypad (with pre-soldered headers)
Jargon buster
Plain-language definitions for the technical terms used above.
- Headers
- Rows of connector contacts on a fixed pitch (commonly 2.54 mm) used to link a board to a breadboard, jumper wires, or another board. They come as male pin headers and female socket headers; when a module ships with pre-soldered headers it can be used straight away, whereas bare pads require soldering the pins yourself.
- microcontroller
- A microcontroller is a small computer on a single chip that runs a stored program and controls connected inputs and outputs such as buttons, sensors, displays and communication interfaces. In a device built around one, it is the part that executes the code and coordinates the device's behaviour.
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