LED S404
0.40" 4-Digit 7-Segment Display
- Overview
- Commands
- Samples
- On-Module Code
A 4-digit 7-segment display at 0.40" digit height — available as a counter with decimal point or a timer with colon between the middle digits, in red or green. Drive it with simple text commands over any supported interface; segment timing and digit multiplexing are handled on the module.
Common uses: countdown timers, score displays, sports clocks, lab instrument readouts, retro digital-clock builds where digits need to read from across a room.
For smaller digits, see LED S284 (0.28"). For larger, see LED S564 (0.56").
Key features • 4 Digit 7 segment LEDs | Resources 📄 Schematics PID: 0x050008 |
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 |
|---|---|
Init() | Initialize the module. Automatically called on power up. |
Digit(n) | Draw n number to LEDs. |
Seg7(i, s) | Draw a single s digit (0 to 9) on i digit. |
Dot(i, v) | Draw a dot at i index with v value (0 off 1 on) on count-type LED. |
Colon(n) | Show colon on time-type LED. |
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
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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Ordering Info
| Product | Part Number | Price |
|---|---|---|
| DUELink LED S404 (Timer Red) | GDL-LDLEDS404-A-TR | $12.95 |