3 x 4 Keypad Membrane
KSh 110.00
In stock
A 3×4 Keypad Membrane is a thin, flexible input device featuring 12 buttons arranged in a matrix of 3 columns and 4 rows. It’s commonly used as a user interface element in various electronic projects and devices.
Here’s a more detailed description:
Key Features:
- Matrix Arrangement: The 12 buttons are internally wired in a matrix. This means that instead of needing one dedicated pin per button, the keypad utilizes a clever arrangement of row and column connections. This significantly reduces the number of microcontroller pins required to read the state of all the buttons (typically requiring only 7 pins).
- Membrane Construction: It’s made of a thin, flexible membrane material, often with a layer of conductive traces underneath each button. When a button is pressed, it creates a momentary electrical connection between a specific row and column.
- Tactile Feedback: Many membrane keypads offer a slight tactile feedback when a button is pressed, providing the user with a subtle confirmation of the input.
- Adhesive Backing: Typically comes with an adhesive backing, allowing for easy mounting onto various surfaces by simply peeling off a protective layer.
- Compact and Lightweight: The membrane construction makes it very thin and lightweight, suitable for applications where space and weight are limited.
- Durability: Despite being thin, these keypads can be surprisingly durable, often rated for over a million key presses.
- Easy Interface: They are relatively easy to interface with microcontrollers like Arduino, Raspberry Pi, and other development boards.
Pinout:
A 3×4 membrane keypad typically has a 7-pin connector. These pins correspond to the 4 rows and 3 columns of the button matrix. The exact pinout can sometimes vary slightly between manufacturers, so it’s always a good idea to check the datasheet or test with a multimeter. However, a common arrangement is:
- Rows (typically labeled R1, R2, R3, R4): These are usually connected to digital input pins on the microcontroller.
- Columns (typically labeled C1, C2, C3): These are usually connected to digital output pins on the microcontroller.
To detect which key is pressed, the microcontroller sequentially drives each column pin high (or low) and then reads the state of the row pins. If a button is pressed, it will create a connection between a specific row and the currently active column, allowing the microcontroller to identify the pressed key.
Applications:
3×4 Membrane Keypads are widely used in various applications, including:
- Security Systems: Entering codes for access control.
- Menu Selection: Navigating menus on small displays.
- Data Entry: Inputting numerical data or short commands into embedded systems.
- Calculator Interfaces: Creating basic calculator functionalities.
- Remote Controls: Simple interfaces for controlling devices.
- DIY Electronics Projects: Providing user input for a wide range of hobbyist projects.
- Industrial Control Panels: Basic input for machinery or equipment.
- Educational Purposes: Teaching about input devices and matrix scanning techniques.
In summary, the 3×4 Membrane Keypad is a cost-effective, compact, and easy-to-use input device that provides a convenient way for users to interact with electronic systems. Its matrix wiring scheme makes it efficient in terms of pin usage on microcontrollers.
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