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SOME THING THAT I KNOW FOR SURE...
You may already know, But not everyone!!!
FRIDAY, JULY 25, 2014
RASPBERRY PI SERVO MOTOR CONTROLLER USING NODE JS
This post is basically to support the below video, I have posted in Youtube
regarding one of my fun projects that I'm working on my Raspberry Pi.
Project - Raspberry Pi Servo Motor Controller using Node JS
Project is to build a small Node JS application that runs a web socket server in
my Raspberry Pi, which then enable my iPhone to connect to the web server using
an ordinary browser like Safari through Web Socket Protocol to send its
Gyroscope data back to Raspberry Pi. Then web server will use this data to send
PWM (Pulse Width Modulation) signals to it's selected GPIO pins connected to a
servo motor.
By doing this I'll be able to control the servo motor using my iPhone over a
LAN.
I know there are many ways you can achieve the same results, But I wanted use
these selected technologies, so I can learn them better (and have FUN of doing
it). I haven't used any Servo Controller Shields in this project either. Enjoy
the video below.
Here is the code :
Server : app.js
1: var express = require('express');
2: var app = express();
3: var server = require('http').createServer(app);
4: var fs = require('fs');
5: var WebSocketServer = require('websocket').server;
6: var piblaster = require("pi-blaster.js");
7:
8:
9: var clients = [ ];
10:
11: //Getting request from browser
12: //and send response back
13: app.get ('/', function(req, res){
14:
15: fs.readFile('ws.html', 'utf8', function(err, text){
16: res.send(text);
17: });
18: });
19:
20: //Listening to Port 1337 for incoming messages
21: server.listen(1337, function (){
22: console.log((new Date()) + " Server is listening on port 1337... ");
23: });
24:
25: websock = new WebSocketServer({
26: httpServer: server
27: });
28:
29: //WebSocket Server
30:
31: websock.on('request', function(request) {
32:
33: console.log((new Date()) + ' Connection from origin ' + request.origin + '.');
34:
35: var connection = request.accept(null, request.origin);
36:
37: console.log((new Date()) + ' Connection accepted.');
38:
39: //Incoming Data handling
40: connection.on('message', function(message) {
41:
42: console.log('Data: ' + message.utf8Data);
43:
44: var data = message.utf8Data;
45: data = data.slice(1,3);
46:
47: // If incoming data is > 2 send a signal to pin 17
48: // Set GPIO pin 17 to a PWM of 24%
49: // Truns the Servo to it's right
50: if (Number(data)>2){
51: piblaster.setPwm(17, 0.24);
52: }
53:
54: // If incoming data is > 2 send a signal to pin 17
55: // Set GPIO pin 17 to a PWM of 6%
56: // Truns the Servo to it's left
57: if (Number(data)<(-2)){
58: piblaster.setPwm(17, 0.06);
59: }
60:
61: // If incoming data is > 2 send a signal to pin 17
62: // Set GPIO pin 17 to a PWM of 15%
63: // Truns the Servo to it's center position
64: if (Number(data)==0){
65: piblaster.setPwm(17, 0.15);
66: }
67:
68: });
69:
70: connection.on('close', function (connection){
71: //close connection
72: piblaster.setPwm(17, 0);
73: });
74:
75: function closePin(){
76: piblaster.setPwm(17, 0);
77: }
78:
79: });
Client Page : ws.html
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>WebSockets - Simple chat</title>
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
</head>
<body>
<div id="content"></div>
<div>
<span id="status">Connecting...</span>
</div>
<script type="text/javascript">
$(function () {
// Position Variables
var x = 0;
var y = 0;
var z = 0;
// Speed - Velocity
var vx = 0;
var vy = 0;
var vz = 0;
// Acceleration
var ax = 0;
var ay = 0;
var az = 0;
var ai = 0;
var arAlpha = 0;
var arBeta = 0;
var arGamma = 0;
var delay = 200;
var vMultiplier = 0.01;
var alpha = 0;
var alpha = 0;
var beta = 0;
var gamma = 0;
var content = $('#content');
var status = $('#status');
// if user is running mozilla then use it's built-in WebSocket
window.WebSocket = window.WebSocket || window.MozWebSocket;
if (!window.WebSocket) {
content.html($('<p>', { text: 'Sorry, but your browser doesn\'t '
+ 'support WebSockets.'} ));
input.hide();
$('span').hide();
return;
}
var connection = new WebSocket('ws://'+document.domain+':1337');
connection.onopen = function () {
status.text('You are connected to ThanboPi Server.' +
'Move your device and Have Fun!!');
};
connection.onerror = function (error) {
content.html($('<p>', { text: 'Sorry, but there\'s some problem with your '
+ 'connection or the server is down.' } ));
};
if (window.DeviceMotionEvent!=undefined) {
window.ondevicemotion = function(event) {
ax = Math.round((event.accelerationIncludingGravity.x * 1));
ay = Math.round(Math.abs(event.accelerationIncludingGravity.y * 1));
az = Math.round(Math.abs(event.accelerationIncludingGravity.z * 1));
ai = Math.round(event.interval * 100) / 100;
rR = event.rotationRate;
if (rR != null) {
arAlpha = Math.round(rR.alpha);
arBeta = Math.round(rR.beta);
arGamma = Math.round(rR.gamma);
}
}
window.ondeviceorientation = function(event) {
alpha = Math.round(event.alpha);
beta = Math.round(event.beta);
gamma = Math.round(event.gamma);
}
setInterval(function() {
connection.send('x' + ax);
}, delay);
}
});
</script>
</body>
</html>
Schematic for this project is fairly simple on, but I'll post is anyway,
Components : RPI, Breadboard, a 1K resistor and a Basic Servo Motor
PS: If you need to know more details with regards to libraries, frameworks and
hardware I'm using in this project, please ask your questions in the comment
section. I would happily assist you.
Posted by Thanura Siribaddana at 5:57 PM 10 comments
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WEDNESDAY, JULY 04, 2012
MAGENTO - LOST CONNECTION TO MYSQL SERVER
I have been facing this issue for past few hours when I tried to do a bulk
insert from Magento database through a custom module to our DWH. Datawarehouse
is running MYSQL server on CentOS 6.2. I was doing a full dump of customers,
products and orders from our Magento store to the Datawarehouse for the first
time. But I couldn't even get more than 2k customers to the DWH database.
Magento module returns an error "Error 2013 : Lost connection to MySQL server".
After doing some reading on the internet I found that, this is nothing to do
with Magento or my custom module. It was just the way MYSQL server was
configured. Luckily it was a easy fix :). Just change the max_allowed_packet
parameter.
In CentOS go to /etc/my.cnf and add or edit the following under [mysqld] section
[mysqld]
max_allowed_packet= 16M
I had 16M to suit my particular situation, choose a value that suites you. This
should work, at least it worked for me ;), also recommend to have look at the
wait_timeout parameter as well since few people mentioned that as well.
Posted by Thanura Siribaddana at 10:17 AM 0 comments
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Labels: connection error, Magento, max_allowed_packet, MYSQL
TUESDAY, MAY 22, 2012
CATCH OF THE DAY FLASH SALE SCAM!!!
Catchoftheday.com.au has announced a "Flash Sale" that is "catch of the day" put
up a "Deal" every hour, and it went all day long today. They had attractive
"DEALS" such as Diablo 3 PC Game which is around $90, just for $20, An Apple TV
3rd Gen worth of $109 just for $39, and many more "DEALS" like that for an
unbelievable price. Unfortunately whole thing was a SCAM!!. First I have tried
to buy Diablo 3, I was at the checkout screen in 40 seconds, but they said "Item
is SOLD OUT". Then Amazon Kindle, same thing happen less than 90 seconds, Next I
tried to buy Apple TV, same thing happen again, I was in the checkout page less
than 50 seconds, SOLD OUT!!. Have a look at the screen shot this is even after I
came back to main page.
NEVER caught in to this CatchofTheDay.com.au's SCAMs!!!!
Posted by Thanura Siribaddana at 10:04 PM 3 comments
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SUNDAY, MAY 13, 2012
HOW TO CREATE AN EXTERNAL DATABASE CONNECTION FROM A MAGENTO MODULE
I reckon that many of you have already done this so many times, but as a
newcomer to Magento, it took me a while to figure this out. So this tutorial is
solely for newcomers like me, so they can save some time.
In this tutorial I'm going to show you how to connect to a external database
(other than Magento database) using a custom Magento module. I’ll be using a
Magento Basic Model and a Resource Model to connect to this external database.
I'll also be using an index controller action to show you that this really works
:).
This is what my custom module is going to do, Module name will be “Blog”, and it
will connect to a database called “externaldb”. This database will have a table
call “blog”. So my module will connect to this external database and read the
data from the blog table. Yep, it ‘s so simple! :D
First create an empty module in you Magento instance. (Hope you already know how
to do this, if not click here to learn how to do it)
Your Module structure will look like below,
CREATING THE CONFIG.XML FILE
Config.xml file plays a major part in Magento and it does the same in this case.
All connection details to the external database can be placed in config.xml of
your module (app/code/local/youmodulename/etc/config.xml), plus your read and
write adapter details will also go in here.
Your config.xml will looks like below,
0.1.0
Externaldb_Blog_Model
blog_resources
Externaldb_Blog_Model_Resource
blog
<![CDATA[localhost]]>
<![CDATA[someuser]]>
<![CDATA[somepassword]]>
<![CDATA[externaldb]]>
<![CDATA[mysql4]]>
<![CDATA[SET NAMES utf8]]>
<![CDATA[pdo_mysql]]>
1
blog_default
blog_default
standard
Externaldb_Blog
externaldb
The section that you really need to understand in above XML, (with regards to
the external database connection) is between "resources" tags. Because it
contains the externaldb connection details, read and write adapter
configurations.
You can see I have created a "blog_default" section with connection details of
the external database. Additionally, read and write adapter that uses
“blog_default” connection.
Note that "blog" in "blog_read" and "blog_write" are the module group name. You
cannot have anything else since I'm going to use the resource model to connect
to the database.
MODEL CLASS FOR BLOG MODULE
Following is the code for Blog Model
(app/code/local/Externaldb/Blog/Model/Blogpost.php),
/**
* Description of Externaldb_Blog_Model_Blogpost
*
* @author thanura
*/
class Externaldb_Blog_Model_Blogpost extends Mage_Core_Model_Abstract{
public function _construct() {
$this->_init('blog/blogpost');
}
public function readDataFromResource(){
return $this->getResource()->readDataFromTable();
}
}
RESOURCE MODEL CLASS ASSOCIATE WITH THE BLOG MODEL
Here is the code for Blog resource
model (app/code/local/Externaldb/Blog/Model/Resource/Blogpost.php),
/**
* Description of Externaldb_Blog_Model_Resource_Blogpost
*
* @author thanura
*/
class Externaldb_Blog_Model_Resource_Blogpost extends Mage_Core_Model_Resource_Db_Abstract{
public function _construct() {
$this->_init('blog/blogpost', 'blog_id');
}
//This function is to load the data using the Read Adapert
//to show you that I have connected to the external db
public function readDataFromTable(){
$readAdapter = $this->_getReadAdapter();
$select = $this->_getReadAdapter()->select()
->from($this->getMainTable());
$data = $readAdapter->fetchAll($select);
return($data);
}
}
INDEX CONTROLLER
Following simple controller will access the Blog Model call to connect to the
external database and retrieve data from blogpost table
/**
* Description of Index Controller for External DB Module
*
* @author thanura
*/
class Externaldb_Blog_IndexController extends Mage_Core_Controller_Front_Action{
public function indexAction(){
$model = Mage::getModel('blog/blogpost');
$results = $model->readDataFromResource();
var_dump($results);
}
}
So thats all about it, now you can connect to a different database using a
custom Magento Module. Hopefully this tutorial will help some of you guys out
there, and if you have any questions, feel free to ask me. I'll try my best to
answer them.
Enjoy!!
Posted by Thanura Siribaddana at 7:52 PM 4 comments
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Labels: Custom Magento Module, External Database, Magento
THURSDAY, JUNE 09, 2011
EASY WAY TO CONTROL YOUR ITUNES - MYTUNESCONTROLLER
MyTunesController allows you to have a simple control over your iTunes. It just
sits on you menu bar, which gives you easy access to the controls. It supports
Lyrics as well. But if you need more functionality other than the basic
Play/Pause/Skip Next or Previous , then you are looking at something like
YouControl. But for me MyTunesController do Job!!
Download MyTunesController for free.
Posted by Thanura Siribaddana at 5:19 PM 0 comments
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Labels: Apple Mac, iTuens, MyTunesController
FRIDAY, APRIL 01, 2011
A “LIKE” BUTTON FROM GOOGLE! - THE “GOOGLE +1 BUTTON”
Google has unveiled their spick-and-span feature to be, the Google +1 Button a
"tour guide" who will help people to discover more relevant content that is
recommended by their friends and contacts.
So in near future, having a Google +1 button on your web pages will let users
recommend your web content, so that their friends and contacts also see these
recommendations when they do a google search in similar context.
Posted by Thanura Siribaddana at 7:33 PM 0 comments
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Labels: +1 button, Google, Google +1 button, Google Search
FRIDAY, DECEMBER 03, 2010
BARCAMP APACHE SYDNEY 2010
Anyone interesting in BarCamps, The Apache BarCamp Sydney 2010 will be running
at University of Sydney on 11th December 2010. The event is free and open for
public. Details are available at http://barcamp.org/BarCampApacheSydney
See you there!
Posted by Thanura Siribaddana at 10:11 AM 0 comments
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Labels: Apache, Apache BarCamp, Sydney
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