node-red-contrib-acr122u_nfc
Version:
NFC acr122u card read node
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Markdown
A simple Node-RED node for working with **ACR122U NFC readers** using the [nfc-pcsc](https://www.npmjs.com/package/nfc-pcsc) library.
Before installing, you should have connected the reader at least once to the computer.
Install via the Node-RED palette manager or with `npm` in your Node-RED user directory (usually `~/.node-red`):
```bash
npm install node-red-contrib-acr122u
```
⚠️ This node depends on the nfc-pcsc library. It will be installed automatically as a dependency.
if not use:
```bash
npm install nfc-pcsc
```
🖧 Requirements
ACR122U or compatible NFC reader
PC/SC smart card service running (usually enabled by default on Windows/macOS)
📚 Usage
This node listens for NFC tags placed on the ACR122U reader and outputs the tag's UID and other relevant info.
Output Message (msg)
Card UID: 2467430b
Card removed: {
atr: <Buffer 2b 7f 80 01 80 4f 0c a0 01 00 03 06 03 00 01 00 00 00 00 6a>,
standard: 'TAG_ISO_14443_3',
type: 'TAG_ISO_14443_3',
uid: '2677460b'
}
Example Flow
You can wire this node into a debug node or a function node to handle tag scans:
[] → [function] → [debug]
⚙️ Configuration
This node requires no configuration — just drop it in your flow and it starts listening for cards.
💡 Notes
Only one NFC reader is supported at a time.
Multiple scans may be emitted depending on tag polling behavior.
On Linux, you may need to add your user to the pcscd or plugdev group and ensure the pcscd daemon is running.
🧪 Development
To test your custom node locally:
```bash
cd ~/.node-red
npm install /path/to/your/node-red-contrib-acr122u_nfc
```
Then restart Node-RED.
📝 License
MIT
© 2025 Itu developments. Contributions welcome!
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