4x4 self-adhesive matrix keyboard module

Description

The 4x4 Membrane Keyboard Module consists of 16 buttons arranged in a matrix (4 rows and 4 columns). Membrane keyboards are characterized by a thin design, which makes them resistant to dirt and long life. The module has an 8-pin connector, which allows for quick connection to popular platforms and microcontrollers such as Raspberry Pi, Arduino, ESP8266, Teensy, STM32 or AVR. The 4x4 Membrane Keyboard is an excellent choice for various electronic projects where a compact and easy-to-use user interface is needed.

The operation of the membrane keyboard is based on matrix technology, in which each of the 16 buttons is connected to common row and column lines. Pressing a button closes the circuit between the corresponding paths, which allows the microcontroller to recognize the pressed key. Thanks to the matrix structure, only 8 ports are needed to operate 16 buttons (4 for rows, 4 for columns), which saves the microcontroller's resources.

Connecting to the microcontroller is simple. You can use digital pins on boards such as Raspberry Pi or Arduino, connecting them to the 8-pin connector of the module. These pins can be connected using goldpins with a pitch of 2.54 mm, which ensures compatibility with breadboards. Reading pressed buttons is carried out by scanning the matrix - the microcontroller sends signals to the rows in turn, checking for activity in the columns.

Examples of applications:

• User interface - 16 buttons can perform control functions in various devices based on Arduino, Raspberry Pi or AVR.
• Alarm systems - as a numeric keypad for entering codes in security systems.
• DIY control panels - allows users to assign unique functions to each button in projects based on microcontrollers.
• Automation - can act as a control panel in various types of machines.

The self-adhesive layer allows for easy mounting on various surfaces. Membrane keyboards are also resistant to dirt, making them ideal for work in more difficult conditions. The 4x4 membrane keyboard is also very lightweight, which further facilitates integration with other devices.

Features

• Length of connecting ribbon: 85 mm (including connector)
• Connector: 8-pin (2.54 mm), compatible with contact boards
• Self-adhesive keyboard - easy installation in various projects
• Maximum electrical parameters: 35 VDC, 100 mA
• Insulation: 100 MOhm, 100 V, 250 V RMS (60 Hz, 1 min)
• Contact vibration: <= 5 ms - fast response to pressing
• Lifespan: up to 1 million clicks
• Operating temperature: from -20 to +40 °C - suitable for various working environments
• Keyboard dimensions: 70 x 77 x 0.8 mm
• Weight: 8 g