4×3 Membrane Keypad Matrix — 12-Key Numeric, 7-Pin Connector, Arduino Compatible

4×3 Membrane Keypad Matrix — 12-Key Numeric, 7-Pin Connector, Arduino Compatible

This 4×3 membrane keypad provides 12 keys in the standard telephone/calculator numeric layout (1–9, *, 0, #) — the most common keypad format for PIN entry and numeric input applications. The flexible membrane construction with adhesive backing allows it to be mounted on any flat surface, and the 7-pin ribbon cable connector makes wiring to Arduino straightforward. Compatible with the Arduino Keypad.h library.

Specifications

• Keys: 12 (4 rows × 3 columns)
• Key Labels: 1–9, *, 0, # (standard telephone layout)
• Interface: 7-pin ribbon cable connector
• Type: Membrane (flexible, thin)
• Adhesive Backing: Yes — peel and stick to any flat surface
• Supply Voltage: 3.3V and 5V compatible (passive matrix)

4×3 vs 4×4 Keypad — Which to Choose?

• 4×3 (this listing): 12 keys, standard numeric layout (0–9, *, #) — for PIN entry and numeric input
• 4×4: 16 keys, adds A/B/C/D function keys — for hex input and multi-function control

Arduino Wiring (Keypad.h Library)

• Connect 7-pin ribbon cable to Arduino digital pins (e.g., D2–D8)
• Install Keypad.h library from Arduino Library Manager
• Define 4-row × 3-column key map in sketch

Typical Applications

• PIN / password entry: Security systems, door locks, and access control
• Numeric data entry: Temperature setpoint, timer, and parameter input
• Panel-mount keypad: Adhered to enclosure panel for finished product appearance
• Phone-style input: Familiar telephone layout for user-friendly numeric entry

Package Contents

• 1 × 4×3 membrane keypad with 7-pin ribbon cable connector

12-key numeric membrane keypad in standard telephone layout — flexible, adhesive-backed, Arduino Keypad.h compatible for PIN entry and numeric input projects.

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