- Stock: Out Of Stock
- Model: Keypad 4X4
- Weight: 8.50g
- Dimensions: 160.00mm x 69.00mm x 2.50mm
- SKU: 1952
High-Performance 4x4 Matrix Human-Machine Interface
This 16-button membrane keypad serves as an intuitive, space-saving human-machine interface (HMI) for embedded systems and microcontroller development platforms. Featuring a standard 4x4 matrix arrangement consisting of 16 tactile keys (0-9, A-D, *, #), it allows users to input numerical data, navigate system menus, and execute commands efficiently while occupying minimal microcontroller I/O pins.
Technical Architecture and Scanning Logic
The keypad operates using a matrix circuit design that routes 16 momentary switches across 4 row lines and 4 column lines. This grid-based configuration reduces the required I/O pins from 16 discrete lines down to just 8 digital pins on your host controller (such as Arduino, Raspberry Pi, STM32, or ESP32). Multiplexed column-and-row scanning code identifies button presses through software debounce algorithms, guaranteeing precise input detection with ultra-low power consumption and contact resistance under 200 Ohms.
Durable Sealed Construction and Easy Mounting
Engineered with a multi-layer flexible PET membrane, this keypad features zero moving mechanical parts, offering exceptional resistance to dust, moisture, and wear. The integrated self-adhesive backing ensures effortless, flush mounting onto control panels, project enclosures, or clean flat surfaces. Connection to the system is established via an integrated flexible ribbon cable terminated with a standard 8-pin female Berg header featuring 0.1 inch (2.54 mm) pin spacing, making it directly compatible with standard headers and breadboard jumpers.
Deployment and Application Scenarios
Designed for versatile deployment in both prototype and production environments, this keypad is widely utilized in electronic access control systems, security code entry locks, custom POS hardware, and industrial automation interfaces. Additionally, its sealed, cleanable surface makes it an ideal user-input interface for commercial automated fluid dispensing systems, including water, milk, and fuel distribution ATMs.
