4×5 Matrix Keypad Arduino

A 4×5 Matrix Keypad is an advanced input device designed for microcontroller-based projects requiring a 20-key interface. It features a 4-row by 5-column grid, allowing efficient key scanning with minimal wiring.

Key Features:

• Layout: 4 rows × 5 columns (20 keys)
• Interface: Matrix scanning with 9 GPIO pins
• Key Labels: Typically 0-9, A-D, *, #, and extra function keys (customizable)
• Operating Voltage: 3.3V – 5V (compatible with most MCUs)
• Material: Soft rubber or hard plastic with conductive backing
• Applications: Security systems, calculators, menu navigation, industrial controls

Compatible with Arduino, Raspberry Pi, STM32, and other microcontrollers, the 4×5 keypad is ideal for applications requiring expanded input options while maintaining a compact and easy-to-use interface.