RFID
RFID Tag and Card Reader
- Overview
- Commands
- Samples
- On-Module Code
An RFID reader that reports the unique ID of any RFID tag or access card placed in range. The module handles the RF protocol and tag interrogation — your host code receives the ID string with simple text commands over any supported interface.
A pack of starter tags is included; any standard RFID tag at the supported frequency should work.
Common uses: access control, attendance projects, library checkout systems, sorting and inventory automation, classroom intro-to-RFID labs.
Key features • RFID reader | Resources 📄 Schematics PID: 0x090005 |
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 |
|---|---|
isCard() | Returns 1 if a new card is detected. |
ReadCard(a1) | read the new card in a 16byte array. |
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 RFID | GDL-WLRFID-B | $19.95 |