KP-301 Standard 3x4 Matrix PCB Keypad, 12 Keys, Press Type
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Prices updated: 13 Oct 2026
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About this product
The KP-301 is a standard 3x4 matrix keypad with 12 press-type keys mounted on a PCB. Matrix keypads are wired in rows and columns, so a microcontroller can read many keys with few pins. It suits numeric entry, access panels and control inputs in Arduino and other microcontroller projects.
Specifications
- Matrix layout
- 3 x 4
- Number of keys
- 12
- Key type
- Press
- Mounting
- PCB
- Wiring type
- Matrix (rows and columns)
Frequently asked questions
How do I wire the KP-301 to an Arduino?
A 3x4 matrix has 7 connections: 4 rows and 3 columns. Connect each to a digital pin and read the keys with the Keypad library. Because pin order differs between manufacturers, identify each row and column with a multimeter continuity test before wiring.
Does it need external pull-up resistors?
Usually not. Keypad libraries typically enable the microcontroller's internal pull-up resistors on the column pins, so external resistors are not needed for basic use.
