4×3 Matrix 12 keys Membrane Switch Keypad
Review: 5 - "A masterpiece of literature" by John Doe, written onMay 4, 20020

4×3 Matrix 12 keys Membrane Switch Keypad

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  • Product SKU: KG326
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A 4x3 matrix membrane switch keypad is a type of input device that consists of 12 keys arranged in a 4-row by 3-column matrix. These keypads are commonly used in various electronic devices and applications where user input is required.

Here's a breakdown of the key features and how they work:

Key Features:

Matrix Layout: The keypad has a matrix layout, which means that each key is uniquely identified by its row and column position. In this case, there are 4 rows and 3 columns, resulting in 12 keys.

Membrane Switch Technology: The keys are typically made of flexible, non-mechanical membrane switches. When a key is pressed, it makes electrical contact between a specific row and column, registering a key press.

Compact Design: These keypads are compact and space-saving, making them suitable for applications with limited space.

Durable: Membrane switch keypads are known for their durability and resistance to environmental factors like dust and moisture.

Easy to Clean: The smooth surface of the membrane makes it easy to clean and maintain.

Contact Closure: When a key is pressed, it closes the circuit for a specific row and column, allowing a microcontroller or other electronics to detect which key has been pressed.

How it Works: When a user presses a key on the membrane keypad, it flexes, causing the top and bottom layers of the membrane switch to come into contact at a specific row and column intersection. This contact closure is detected by the electronics connected to the keypad.

To interface with a microcontroller or other digital system, you typically connect the rows and columns of the keypad to the GPIO (General Purpose Input/Output) pins of the microcontroller. Each key corresponds to a unique row-column intersection, which allows the microcontroller to identify which key has been pressed based on the electrical contact made.

These keypads are commonly used in a wide range of applications, including:

Consumer Electronics: Remote controls, calculators, and small appliances often use membrane keypads for user input.

Industrial Control Panels: Membrane keypads are used in industrial control panels for machine control and data entry.

Security Systems: Access control systems and security panels often incorporate membrane keypads for PIN entry.

Medical Devices: Many medical devices and equipment use membrane keypads for input and control.

Automotive: Some car radios and entertainment systems feature membrane keypads for button controls.

Package Includes

  • 1 x DC 12V 4×3 Matrix 12 keys Membrane Switch Keypad
Voltage(V) DC 35V
Operating Current (A) 0.1
Contact Resistance 500Ω
Insulation Resistance (MΩ) 100
Dielectric Strength 250VRms
Length (mm) 70
Width (mm) 70
Height (mm) 1
Weight (gm) 7
Ribbon cable length (mm) 90

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