nodeacr122u

Lightweight LibNFC glue for Node.js (intended for reading Mifare Classic RFIDs via ACR122U)

Example

#!/usr/bin/env node
 
var Acr122U = require('nodeacr122u');
 
var dev = Acr122U.create();
dev.open( 'acr122_usb:', function(obj, err) {
    if( err ) {
        console.log("Acr122U: Failed to open device: "+err);
        return false;
    }
    dev['data'] = function(data) {
        console.log("Acr122U event: "+JSON.stringify(data, null, 2));
    };
});
 
// Hack to prevent Node.js from exiting, sorry.
var http = require('http');
var httpServer = http.createServer(function(){});
httpServer.listen(8084);
console.log("Listening for keyboard input...");

Methods

Factory

Acr122u::create()

Returns an initialised Acr122u object.

• Returns: An initialised Acr122u object.

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Acr122u object

Acr122uObject::open( path, callback( acr122uObject, error ) )

Open an Acr122u device, associate it to this object, and fire the provided callback upon completion.

The parameters passed to the provided callback function are Acr122uObject which is a reference to the Acr122u object, and error which will be an error string in the case of an error, or undefined on success.

• Returns: A reference to itself.

Acr122uObject::data( Acr122uEvent )

A virtual method of the Acr122uObject. Reimplement it to handle Acr122uEvents. It can be ignored, but if you ignore it, you might as well not use this module at all.

Acr122uObject::closed( Acr122uObject )

A virtual method of the Acr122uObject. Reimplement it to react to the device being closed. Otherwise it can be ignored.