tk4100-rfid-reader
v1.0.0
Published
Read cards from a USB TK4100 / EM4100 card reader
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tk4100-rfid-reader
Read cards from a USB TK4100 / EM4100 card reader
Only tested on Raspberry PI but should work on any Linux OS. I personally used this reader from Amazon.
Usage
As a module
First, install the module
npm install tk4100-rfid-reader
Then use it like:
var RFIDReader = require('tk4100-rfid-reader');
var rr = new RFIDReader({
device: '/dev/input/event0', // input device to read
maxLength: 32 // max key length, defaults to 32, set to 0 to disable
});
rr.on('tag', function (tag) {
// tag as a hex string
// tag => "abcd1234"
});
rr.on('error', function (err) {
// error was encountered while reading
// currently this is only fired if the key is greater than maxLength
});
As a command line tool
The tk4100-rfid-reader
command will listen for new tags being read by the
reader, and then fork an external command for each new tag ran in order.
Install the tool globally
npm install -g tk4100-rfid-reader
Then create a JSON config file
{
"device": "/dev/input/event0",
"exec": {
"file": "./new-tag",
"options": {
"timeout": 30000,
"uid": 1000,
"gid": 1000
}
},
"log": {
"level": "debug",
"name": "rfid-reader"
}
}
device
: thedevice
passed to theRFIDReader
constructor to listen for eventsexec.file
: command to execute for each new tag detectedexec.options
: exec options - passed directly tochild_process.execFile
log
: passed directly to the bunyan constructor for logging
And finally create the ./new-tag
script - this will be executed whenever a
new tag is read.
#!/usr/bin/env bash
tag=$RFID_TAG_ID
echo "running command as $(whoami) for tag $tag"
This program will be executed with the environmental variable RFID_TAG_ID
set.
Example
# tk4100-rfid-reader config.json
[2018-07-16T21:03:06.269Z] INFO: rfid-reader/5970 on garage-pi.rapture.com: watching for events on /dev/input/event0
[2018-07-16T21:03:08.605Z] DEBUG: rfid-reader/5970 on garage-pi.rapture.com: read tag "abcd1234"
[2018-07-16T21:03:08.615Z] DEBUG: rfid-reader/5970 on garage-pi.rapture.com: executing "./new-tag"
opts: {
"env": {
"TERM": "xterm-256color",
"SSH_AUTH_SOCK": "/tmp/ssh-P0FEDWaaeL/agent.1566",
"PATH": "/opt/custom/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/home/dave/bin",
"TZ": "US/Eastern",
"HOME": "/home/dave",
"SHELL": "/bin/bash",
"MAIL": "/var/mail/root",
"LOGNAME": "root",
"USER": "root",
"USERNAME": "root",
"SUDO_COMMAND": "./tk4100-rfid-reader config.json",
"SUDO_USER": "dave",
"SUDO_UID": "1001",
"SUDO_GID": "1003",
"RFID_TAG_ID": "abcd1234"
},
"encoding": "utf8",
"timeout": 30000,
"uid": 1000,
"gid": 1000
}
[2018-07-16T21:03:08.658Z] DEBUG: rfid-reader/5970 on garage-pi.rapture.com: execution succeeded (stderr="")
stdout: running command as pi for tag abcd1234
License
MIT License