Chrono

LED Matrix with optional Battery

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Overview

Chrono is a wearable-friendly DUELink microcomputer built around a 5×5 LED matrix, two user buttons, and a power section that accepts both CR2032 coin cells and 3.7 V lithium batteries. Slots at the ends let it ride on a wristband or lanyard.

Code it in Python, JavaScript, .NET, Arduino, or C++, or run standalone with MicroBlocks.

Pick Chrono for wearable projects, name badges, scrolling-message demos, or any classroom activity where students want to take their work home.

Key features • 5x5 LED Matrix • 2x user buttons • 3V CR2032 Battery compatible • 3.7V Lithium Battery Compatible • Slotted ends for wristband or mounting • 31x37mm Overall Dimension

Resources 📄 Schematics 🔩 3D STEP file PID: 0x0C0004

🌿 Cables not included

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

Commands this module accepts. See Samples for runnable code in popular host languages.

tip

The commands below set the display up. To draw on it, use the engine's built-in Graphics library — the same drawing functions (Line, Text, Rect, Show, etc.) render to any display in the DUELink catalog, so the same drawing code works no matter which display you have connected.

Function	Description
GetW()	Get display width: 5.
GetH()	Get display height: 5.
IsColor()	Returns 0.
BtnA()	Returns 1 if button A is pressed.
BtnB()	Returns 1 if button B is pressed.
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.

Chrono Driver

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See full example on GitHub

Samples

Example code that calls this module's commands from popular host languages.

tip

New here? See Get Started to connect a module and send your first command.

Python

Python Sample

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See full example on GitHub

MicroPython

MicroPython Sample

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See full example on GitHub

JavaScript

JavaScript Sample

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See full example on GitHub

.NET

.NET Sample

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See full example on GitHub

Arduino

Arduino Sample

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See full example on GitHub

MicroBlocks

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 Link

On-Module Code

Code that runs directly on this module's MCU. See how On-Module Code allows modules to run standalone.

Script

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.

Standalone Script Sample

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See full example on GitHub

Arduino IDE

See Arduino IDE page for more info.

Standalone Arduino Sample

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See full example on GitHub

Ordering Info

Product	Part Number	Price
DUELink Chrono (Blue)	GDL-SPCHRONO-A-B	$5.95

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