1. Introduction
The Dioche 16-Key 4x4 Keyboard Module is a compact and versatile input device designed for integration with single-chip microcontrollers. This module provides 16 tactile buttons arranged in a 4x4 matrix, offering a straightforward interface for various embedded projects. Its small footprint and ease of connection make it an excellent choice for adding external keypad functionality to your microcontroller applications.
Figure 1: Front view of the Dioche 16-Key 4x4 Keyboard Module, showing the 16 buttons labeled 1-9, *, 0, #, and A-D.
2. Product Features
- Versatile 4x4 Design: Features a total of 16 keys, providing diverse input options for various applications.
- Compact and Space-Saving: Designed with a small footprint to occupy minimal space, ideal for integrated microcontroller setups.
- Ideal for MCU Projects: A suitable component for single-chip microcontroller applications, enhancing user interface and control.
- Seamless Connectivity: Ensures smooth and efficient connection with microcontrollers, allowing for quick setup and implementation.
- Robust Functionality: Carefully designed structure ensures all 16 keys are accessible and responsive for reliable operation.
3. Setup and Connection
The Dioche 16-Key 4x4 Keyboard Module connects to a microcontroller using its pin header. The 4x4 matrix design typically requires 8 pins for connection (4 rows and 4 columns).
3.1 Pinout Diagram
Refer to the image below for a visual representation of the module's connection pins. The pins are typically arranged as 4 row pins and 4 column pins.
Figure 2: Isometric view of the keyboard module, highlighting the green PCB with solder points for connecting to a microcontroller.
3.2 Connection Steps
- Identify Pins: Locate the 8 pins on the module. These will correspond to the 4 rows and 4 columns of the keypad matrix.
- Connect to Microcontroller: Connect the row and column pins of the keypad module to appropriate digital I/O pins on your microcontroller. Ensure proper wiring to avoid damage.
- Power Supply: The module typically draws power directly from the microcontroller's I/O pins during operation, requiring no separate power supply.
- Software Configuration: Implement a keypad scanning algorithm in your microcontroller's firmware to detect key presses. This usually involves setting row pins as outputs and column pins as inputs (or vice-versa) and scanning them sequentially.
4. Operating the Keyboard Module
Once connected and programmed, the keyboard module functions as a standard input device. Each key press can be detected by the microcontroller, allowing for various interactive applications.
4.1 Key Mapping
The 4x4 matrix typically maps keys as follows:
| Column 1 | Column 2 | Column 3 | Column 4 |
|---|---|---|---|
| 1 (Row 1) | 2 (Row 1) | 3 (Row 1) | A (Row 1) |
| 4 (Row 2) | 5 (Row 2) | 6 (Row 2) | B (Row 2) |
| 7 (Row 3) | 8 (Row 3) | 9 (Row 3) | C (Row 3) |
| * (Row 4) | 0 (Row 4) | # (Row 4) | D (Row 4) |
Your microcontroller code will read the state of the row and column pins to determine which key is pressed.
5. Specifications
| Feature | Detail |
|---|---|
| Brand | Dioche |
| Model Number | Dioche30to2nc6kf |
| Key Quantity | 16 (4x4 Matrix) |
| Material | ABS |
| Item Weight | 0.847 ounces |
| Package Dimensions | 2.76 x 2.76 x 0.39 inches |
| Manufacturer | Dioche |
6. Maintenance
The Dioche 16-Key 4x4 Keyboard Module is designed for durability and requires minimal maintenance.
- Cleaning: If necessary, gently wipe the surface of the keypad with a dry, soft cloth. Avoid using harsh chemicals or abrasive materials.
- Storage: Store the module in a dry environment, away from extreme temperatures and direct sunlight, when not in use.
- Handling: Avoid applying excessive force to the keys or bending the PCB to prevent damage to the internal components.
7. Troubleshooting
If you encounter issues with your keyboard module, consider the following troubleshooting steps:
- No Key Press Detected:
- Verify all connections between the module and the microcontroller are secure and correct.
- Check your microcontroller's code for errors in the keypad scanning logic.
- Ensure the microcontroller's I/O pins are configured correctly (input/output modes, pull-up resistors if needed).
- Incorrect Key Detected:
- Review your key mapping in the software to ensure it matches the physical layout and pin connections.
- Check for short circuits between adjacent pins or keys on the module.
- Intermittent Operation:
- Ensure stable power supply to the microcontroller.
- Check for loose connections or cold solder joints.
- Consider adding debounce logic in your software to handle mechanical key bounce.
8. Support
For further assistance or to explore other products, please visit the official Dioche store.