The 4×4 Matrix 16 Key Keypad Module is a 16-button input pad arranged in a 4 row by 4 column grid, operating from 3.3V to 5V and connecting to an Arduino or microcontroller through just 8 pins — 4 row pins and 4 column pins — rather than requiring one individual wire per button. This keypad module works by a technique called matrix scanning: pressing any button connects one row wire to one column wire at the point where they cross, and the Arduino detects which specific row-column combination has been connected to identify which of the 16 keys was pressed, giving full 16-key input through only 8 GPIO pins.
The 4×4 matrix keypad module is widely used for password entry systems, numeric input, menu navigation, and access control projects — the 16 keys typically provide digits 0 through 9, letters A through D, and two special characters (star and hash), giving enough input options for PIN-based locks, calculator builds, and menu control systems without any additional hardware. The keypad module for arduino uses standard 2.54mm pin pitch, making it compatible with standard breadboard and Dupont wire connections for quick prototyping without soldering.
The 16 key keypad module’s momentary switch buttons register only while pressed and release immediately toggle switches that stay in position — which is the correct behavior for keypad input where each key press should generate one single event rather than a continuous held signal. Available from StemVolt, offering quality electronics parts.
Related Products:
- Checkout Push Button 4-Pin
Features:
- 16 keys controlled via only 8 pins using row-column scanning
- Matrix scanning detects any of 16 keys through row-column intersection
- Momentary switches register single press events without latching
- 2.54mm standard pitch — breadboard and Dupont wire compatible
Technical Specification:
Applications:
- Password PIN entry for Arduino-based door lock security system
- Student builds 4×4 matrix keypad calculator STEM project
- Numeric input for arduino LCD menu navigation and selection control
- Access control system with 16 key keypad for code-entry lock
Package Includes:
- 1 × 4×4 Matrix 16 Key Keypad Module
Akshat Mantri, –
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COD availability, safe packaging, and whatsapp support made the overall buying experience excellent.
Pranjal Patni –
4×4 Matrix keypad module worked perfectly with arduino and provided responsive input for projects.
Nimish Sarawagi –
Delivered in 4 days as promised