wiegand

Decoder for wiegand readers on GPIO.
Currently works on linux only, but can be tested on other platforms.

requirements

* Linux with GPIO
* node-gyp

installation

``bash
$ npm install --save wiegand
`

running

Make sure you export your GPIO pins according to the epoll docs:

`bash
#!/bin/sh
echo 17 > /sys/class/gpio/export
echo in > /sys/class/gpio/gpio17/direction
echo both > /sys/class/gpio/gpio17/edge
`

Note: If you are using the GPIO command to export, it does not automatically set the edge for you. You must do it separately:

`bash
$ gpio export 17 in
$ echo both > /sys/class/gpio/gpio17/edge
`

usage

`js
const wiegand = require('wiegand');

const w = wiegand();

w.begin({ d0: 17, d1: 18});

w.on('data', (length, data) => {
console.log('Got', length, 'bits from wiegand with data:' data);
});

w.on('keypad', (num) => {
console.log('Got', num, 'from the reader\'s keypad');
});

w.on('reader', (id) => {
console.log('Got', id, 'from RFID reader');
});

`

api

$3

inherits EventEmitter

#### method: begin([options], [callback])

default options:
`js
{
// RaspberryPI default
d0: 17,
d1: 18,
}
`

callback will fire on the ready event or if an error happens during the process. Errors will be emited on the error event.

#### method: stop([callback])

stop polling for changes to GPIO. Will callback when done and emit a stop` event.

#### event: 'ready'

#### event: 'data'

#### event: 'error'

#### event: 'reader'

#### event: 'keypad'

#### event: 'stop'

license

The MIT License