basham · May 1, 2024 12:56 · Oct 4, 2013 · Feb 2, 2011 · Feb 2, 2011 · Feb 2, 2011
diff --git a/nodejs-rfid.js b/nodejs-rfid.js
@@ -9,6 +9,10 @@ CODE REPOSITORY
 ---------------
 https://gist.github.com/806605
 
+VIDEO DEMO
+----------
+http://www.flickr.com/photos/chrisbasham/5408620216/
+
 CHANGE LOG
 ----------
 02/02/2011 - Refactored code and acknowledged contributors. Listening for other helpful stream Events.

diff --git a/nodejs-rfid.js b/nodejs-rfid.js
@@ -69,7 +69,7 @@ var ids = [];
 
 // ARGUMENT 2:
 // Simplifies restruction of stream if one bit comes at a time.
-// However, I don't know if or how it affects performance with this setting.
+// However, I don't know if or how this setting affects performance.
 fs.createReadStream('/dev/cu.usbserial-A600exqM', { bufferSize: 1 })
 
 .on('open', function(fd) {

diff --git a/nodejs-rfid.js b/nodejs-rfid.js
@@ -69,6 +69,7 @@ var ids = [];
 
 // ARGUMENT 2:
 // Simplifies restruction of stream if one bit comes at a time.
+// However, I don't know if or how it affects performance with this setting.
 fs.createReadStream('/dev/cu.usbserial-A600exqM', { bufferSize: 1 })
 
 .on('open', function(fd) {

diff --git a/nodejs-rfid.js b/nodejs-rfid.js
@@ -1,7 +1,7 @@
 /*
 
-ABOUT
------
+DESCRIPTION
+-----------
 Use NodeJS to read RFID ids through the USB serial stream. Code derived from this forum:
 http://groups.google.com/group/nodejs/browse_thread/thread/e2b071b6a70a6eb1/086ec7fcb5036699
 
@@ -58,6 +58,7 @@ var fs = require('fs');
 
 // Stores the RFID id as it reconstructs from the stream.
 var id = '';
+// List of all RFID ids read
 var ids = [];
 
 // ARGUMENT 1:

diff --git a/nodejs-rfid.js b/nodejs-rfid.js
@@ -5,12 +5,26 @@ ABOUT
 Use NodeJS to read RFID ids through the USB serial stream. Code derived from this forum:
 http://groups.google.com/group/nodejs/browse_thread/thread/e2b071b6a70a6eb1/086ec7fcb5036699
 
+CODE REPOSITORY
+---------------
+https://gist.github.com/806605
+
+CHANGE LOG
+----------
+02/02/2011 - Refactored code and acknowledged contributors. Listening for other helpful stream Events.
+02/01/2011 - Created initial code.
+
 AUTHOR
 ------
 Chris Basham
 @chrisbasham
 http://bash.am
-02/01/2011
+https://github.com/basham
+
+CONTRIBUTORS
+------------
+Elliott Cable
+https://github.com/elliottcable
 
 SOFTWARE
 --------
@@ -38,31 +52,49 @@ EXAMPLE RFID IDs
 
 */
 
+// NodeJS includes
 var sys = require('sys');
 var fs = require('fs');
 
-// This will be unique to your hardware.
+// Stores the RFID id as it reconstructs from the stream.
+var id = '';
+var ids = [];
+
+// ARGUMENT 1:
+// Stream path, unique to your hardware.
 // List your available USB serial streams via terminal and choose one:
 //   ls /dev | grep usb
 // Had trouble with TTY, so used CU.
-var serial = '/dev/cu.usbserial-A600exqM';
+
+// ARGUMENT 2:
 // Simplifies restruction of stream if one bit comes at a time.
-var f = fs.createReadStream(serial, { bufferSize: 1 }); 
-// Stores the RFID id as it reconstructs from the stream.
-var id = '';
+fs.createReadStream('/dev/cu.usbserial-A600exqM', { bufferSize: 1 })
+
+.on('open', function(fd) {
+	sys.puts('Begin scanning RFID tags.');
+})
+
+.on('end', function() {
+	sys.puts('End of data stream.');
+})
+
+.on('close', function() {
+	sys.puts('Closing stream.');
+})
 
-f.addListener('open', function(fd) {
-	sys.puts('SCAN RFID TAGS');
-	sys.puts('--------------');
-});
+.on('error', function(error) {
+	sys.debug(error);
+})
 
-f.addListener('data', function(chunk) {
-	var c = chunk.toString('ascii').match(/\w*/)[0]; // Only keep hex chars
-	if ( c == '' ) { // Found non-hex char
-		if ( id != '' ) // The ID isn't blank
-			sys.puts(id); // The complete ID is reconstructed
+.on('data', function(chunk) {
+	chunk = chunk.toString('ascii').match(/\w*/)[0]; // Only keep hex chars
+	if ( chunk.length == 0 ) { // Found non-hex char
+		if ( id.length > 0 ) { // The ID isn't blank
+			ids.push(id); // Store the completely reconstructed ID
+			sys.puts(id);
+		}
 		id = ''; // Prepare for the next ID read
 		return;
 	}
-	id += c; // Concat hex chars to the forming ID
+	id += chunk; // Concat hex chars to the forming ID
 });
diff --git a/nodejs-rfid.js b/nodejs-rfid.js
@@ -61,8 +61,8 @@ f.addListener('data', function(chunk) {
 	if ( c == '' ) { // Found non-hex char
 		if ( id != '' ) // The ID isn't blank
 			sys.puts(id); // The complete ID is reconstructed
-		id = ''; // Prepare for the next ID chunks
+		id = ''; // Prepare for the next ID read
 		return;
 	}
-	id += c; // Add to the ID
+	id += c; // Concat hex chars to the forming ID
 });
diff --git a/nodejs-rfid.js b/nodejs-rfid.js
@@ -28,6 +28,14 @@ http://www.sparkfun.com/products/8628
 EM4102 125 kHz RFID Tags
 http://www.trossenrobotics.com/store/p/3620-Blue-Key-Fob.aspx
 
+EXAMPLE RFID IDs
+----------------
+2800F7D85D5A
+3D00215B3671
+31007E05450F
+31007E195503
+2800F77C5BF8
+
 */
 
 var sys = require('sys');
@@ -40,25 +48,21 @@ var fs = require('fs');
 var serial = '/dev/cu.usbserial-A600exqM';
 // Simplifies restruction of stream if one bit comes at a time.
 var f = fs.createReadStream(serial, { bufferSize: 1 }); 
-
+// Stores the RFID id as it reconstructs from the stream.
 var id = '';
 
-f.addListener('open', function(fd) { 
+f.addListener('open', function(fd) {
 	sys.puts('SCAN RFID TAGS');
 	sys.puts('--------------');
 });
 
-f.addListener('data', function(chunk) { 
-
+f.addListener('data', function(chunk) {
 	var c = chunk.toString('ascii').match(/\w*/)[0]; // Only keep hex chars
-
 	if ( c == '' ) { // Found non-hex char
 		if ( id != '' ) // The ID isn't blank
-			sys.puts(id);
+			sys.puts(id); // The complete ID is reconstructed
 		id = ''; // Prepare for the next ID chunks
 		return;
 	}
-
 	id += c; // Add to the ID
-
 });
diff --git a/nodejs-rfid.js b/nodejs-rfid.js
@@ -32,15 +32,21 @@ http://www.trossenrobotics.com/store/p/3620-Blue-Key-Fob.aspx
 
 var sys = require('sys');
 var fs = require('fs');
+
+// This will be unique to your hardware.
+// List your available USB serial streams via terminal and choose one:
+//   ls /dev | grep usb
+// Had trouble with TTY, so used CU.
+var serial = '/dev/cu.usbserial-A600exqM';
 // Simplifies restruction of stream if one bit comes at a time.
-var f = fs.createReadStream('/dev/cu.usbserial-A600exqM', { bufferSize: 1 }); 
+var f = fs.createReadStream(serial, { bufferSize: 1 }); 
 
 var id = '';
 
 f.addListener('open', function(fd) { 
 	sys.puts('SCAN RFID TAGS');
 	sys.puts('--------------');
-})
+});
 
 f.addListener('data', function(chunk) { 
 

diff --git a/nodejs-rfid.js b/nodejs-rfid.js
@@ -0,0 +1,58 @@
+/*
+
+ABOUT
+-----
+Use NodeJS to read RFID ids through the USB serial stream. Code derived from this forum:
+http://groups.google.com/group/nodejs/browse_thread/thread/e2b071b6a70a6eb1/086ec7fcb5036699
+
+AUTHOR
+------
+Chris Basham
+@chrisbasham
+http://bash.am
+02/01/2011
+
+SOFTWARE
+--------
+NodeJS, version 0.2.6
+http://nodejs.org
+
+HARDWARE
+--------
+Sparkfun RFID USB Reader
+http://www.sparkfun.com/products/8852
+
+RFID Reader ID-20
+http://www.sparkfun.com/products/8628
+
+EM4102 125 kHz RFID Tags
+http://www.trossenrobotics.com/store/p/3620-Blue-Key-Fob.aspx
+
+*/
+
+var sys = require('sys');
+var fs = require('fs');
+// Simplifies restruction of stream if one bit comes at a time.
+var f = fs.createReadStream('/dev/cu.usbserial-A600exqM', { bufferSize: 1 }); 
+
+var id = '';
+
+f.addListener('open', function(fd) { 
+	sys.puts('SCAN RFID TAGS');
+	sys.puts('--------------');
+})
+
+f.addListener('data', function(chunk) { 
+
+	var c = chunk.toString('ascii').match(/\w*/)[0]; // Only keep hex chars
+
+	if ( c == '' ) { // Found non-hex char
+		if ( id != '' ) // The ID isn't blank
+			sys.puts(id);
+		id = ''; // Prepare for the next ID chunks
+		return;
+	}
+
+	id += c; // Add to the ID
+
+});