Keypad
Button Keypad
- Overview
- Commands
- Samples
- On-Module Code
A 4×4 numerical keypad with 16 soft tactile buttons in a grid. The module scans the matrix internally and reports which key was pressed with simple text commands over any supported interface — no row-column scanning code in your host.
Common uses: PIN entry pads, calculator-style projects, classroom keypad-scanning lessons, room-access prototypes, and any project that needs digit entry without a touch screen.
Key features • 4x4 numerical keypad | Resources 📄 Schematics PID: 0x04000C |
Modules ship without cables to reduce waste. Some specialty boards include a USB cable; for the rest, see Cables to add cables to your order.
Commands this module accepts. See Samples for runnable code in popular host languages.
| Function | Description |
|---|---|
IsKeyChange() | Returns true if a a change happened, press or unpress. |
RdKey() | Read the current key state, in ASCII. Zero for no press. |
DVer() | This driver version. |
Peek under the hood
The script below is this module's driver — it teaches the hardware how to respond to the commands listed above. It ships pre-loaded from the factory; most users never need to open it.
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Example code that calls this module's commands from popular host languages.
New here? See Get Started to connect a module and send your first command.
- Python
- MicroPython
- JavaScript
- .NET
- Arduino
- MicroBlocks
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This sample runs in MicroBlocks on a any host board that's connected/tethered to this module, or a chain of modules. This module keeps its official DUELink firmware and module driver and responds to commands from the connected MicroBlocks-running host. New here? See the MicroBlocks page.
There are two ways to use it:
Open the full sample — the complete project (the module's library plus a ready-to-run example) opens directly on the MicroBlocks website.
Add just the libraries to your own project — copy the link, then in your MicroBlocks project click Add Library → Cloud and paste it. This loads this module's libraries into your project without replacing your current work.
Copy Library LinkCode that runs directly on this module's MCU. See how On-Module Code allows modules to run standalone.
- Script
- Arduino IDE
This example runs using the default DUELink Internal Engine using its Scripting Language, and it expects the module's driver to be loaded first, see the Commands Tab.
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See Arduino IDE page for more info.
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Ordering Info
| Product | Part Number | Price |
|---|---|---|
| DUELink Keypad (4x4) | GDL-HIKEYP-B-44 | $14.95 |