4×4 Matrix 16 Keyboard Keypad Black Heavy

Specification	Details
Configuration	4 x 4 Matrix (16 Keys)
Key Symbols	0-9, A, B, C, D, *, #
Contact Resistance	< 100Ω
Insulation Resistance	100MΩ (100V)
Dielectric Strength	250VRms (50Hz, 1 min)
Operating Force	150-200g
Life Expectancy	> 1,000,000 cycles

Price

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₹ 161.02

(Tax included)

Barcode: 96381336

Product Description

The 4x4 Matrix Keypad uses a scanning method to identify key presses, reducing the number of microcontroller pins required from 16 down to just 8. When a key is pressed, it shorts one row line to one column line. The "Heavy" design ensures that each keypress is deliberate and registered accurately, preventing the "double-entry" errors common with cheaper alternatives. It comes with a standard 8-pin female header, allowing for quick connection via jumper wires or direct PCB mounting.

Key Features

Tactile Feedback: Each button provides a physical "click" sensation, ensuring the user knows exactly when a key has been successfully pressed.
Pin Efficiency: Control 16 individual inputs using only 8 digital I/O pins on your microcontroller.
Durable Construction: Built with heavy-duty plastic and reliable internal switches for high-traffic use in lockers or access systems.
Standard Symbols: Includes full hexadecimal support (0-F equivalent via A-D keys) and standard telephone symbols (* and #).
Flexible Mounting: Low-profile design can be mounted onto a front panel or integrated into a custom 3D-printed enclosure.

Technical Details

Operating Temperature: -20°C to +60°C.
Dimensions: Approx. 65mm x 64mm.
Connector: 2.54mm pitch 8-pin female header.

Prototyping and Engineering Tips from Robogears

The Keypad Library: For Arduino, use the standard Keypad.h library. You will need to define the Row Pins and Column Pins in your code and map them to a character array. This library handles the "scanning" logic automatically, giving you a simple getKey() function.
Software Debouncing: While this heavy-duty keypad has high-quality switches, mechanical buttons can still "bounce" (trigger multiple times per press). The Keypad.h library includes built-in debouncing, but ensure your code isn't running so fast that it catches the same press twice.
Saving Pins with I2C: If 8 pins are too many for your project, use a PCF8574 I2C I/O Expander. This allows you to control the entire 16-key matrix using only 2 pins (SDA and SCL) on your Arduino.
Security Implementation: When building a passcode lock, never store the "Master Code" directly in the main loop. Store it in EEPROM so that the code is remembered even if the power is cut or the system is reset.

Package Includes

1 x 4x4 Matrix 16-Key Keyboard Keypad (Black Heavy)

Disclaimer

The pins are delicate; avoid bending them during installation. Ensure the 8-pin connector is oriented correctly according to your code's pin mapping to avoid scrambled key inputs.

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