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4 X 3 Matrix Array 12 Keys 4*3 Switch Keypad Keyboard Module For Arduino
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8,500RWF
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The 12-Key Membrane Switch Keypad with a 4 x 3 Matrix Array is a compact and durable input module designed for Arduino projects. With its 12 keys arranged in a grid, this module simplifies user interaction and offers easy interfacing with Arduino. Its low-profile membrane technology ensures reliability and resistance to dust and liquid. This versatile keypad is ideal for applications such as access control, calculators, and menu navigation in various Arduino-based projects.
Description
A 12-key membrane switch keypad in a 4 x 3 matrix array is a type of input device commonly used in electronic projects, including those involving Arduino microcontrollers. This keypad module allows users to input numerical and functional data through a compact and durable interface. Here’s a detailed description:
- Membrane Switch Keypad: The primary component is a membrane switch keypad, which is a type of keyboard with keys made of flexible, low-profile, and typically transparent or translucent materials. The keys are pressure-sensitive and do not physically move when pressed.
- 12 Keys: This keypad module contains a total of 12 keys. These keys can include numeric digits (0-9) and additional function keys (e.g., *, #, A, B, C, D) for various applications.
- 4 x 3 Matrix Array: The 12 keys are arranged in a 4 x 3 matrix array, meaning there are 4 rows and 3 columns of keys. This matrix configuration simplifies wiring and allows for efficient use of input/output pins on microcontrollers like Arduino.
- Matrix Keyboard Module: This is essentially a module that includes the membrane switch keypad and related circuitry to interface with microcontrollers like Arduino. It often incorporates a pre-designed circuit to handle key presses and releases.
- Membrane Technology: The keys in this keypad module use membrane technology, where each key press connects a specific row and column in the matrix, resulting in a unique key identification.
Physical Specifications:
- Dimensions: Typically, the module measures approximately 77mm x 68mm, but dimensions can vary slightly between manufacturers.
- Key Size: Each key is approximately 12mm x 12mm.
- Keypad Thickness: Usually around 1.0mm to 2.0mm.
- Material: Membrane keys are made of flexible and durable materials, often polyester.
Electrical Specifications:
- Voltage Rating: Typically compatible with 3.3V or 5V systems, matching the voltage requirements of Arduino.
- Current Consumption: Minimal power consumption during key press detection, often in the microampere range.
- Contact Resistance: Low contact resistance for reliable key press detection.
- Lifecycle: Membrane keypads can typically endure millions of key presses before showing signs of wear.
Matrix Configuration:
- Matrix Layout: 4 x 3 matrix array (4 rows x 3 columns).
- Key Identification: Each key corresponds to a unique row and column intersection in the matrix, enabling keypress detection through scanning.
Interface:
- Connection: Typically, the keypad connects to an Arduino or similar microcontroller through standard digital input/output (I/O) pins.
- Pinout: The keypad module usually has 7 pins (4 for rows and 3 for columns) for connection.
- Interface Method: Key presses are detected by scanning the rows and columns of the matrix.
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