Ads 468x60px

Wednesday, October 26, 2011

OpenCV on android phones

Hi all

          Open Computer Vision (CV) library is compatible with android .We can download OpenCV for Android from following  link .

We will also get pre-compiled example apk files from  the following link

Take a look at this

Try it..

Tuesday, October 25, 2011

SSH for android

Hi all

       Here is an ssh client on android .Used to connect android phone and PC through SSH .

App name: ConnectBot

Give the ip of the Linux PC ,then it will connect to the terminal of Linux.

Take a look at this picture

Try it..

Bash for android

Hi all

       Here is the Terminal emulator on android phones .

Find Android terminal emulator on following link

Name of the app : Android Terminal emulator
Link :

Look at the picture

Try it...

Python for android :SL4A

Hi all

        I have seen a python intrepreter on android phones .Here is the link for this project 

SourceLair :A free Compiler collection app on for android phone

Hi all 

        I got an app for compiling C,CPP,Pascal and Fortran on android phones.The app is available in android market .App is named as SourceLair .

Try it...

Monday, October 24, 2011

DELL XCD 35 Review

Hi all
         Today i like to review Dell's smart phone called DELL XCD 35 .Recently i purchased this phone .
Here is the specs of this phone

Tech Specs

Operating System

    • Android 2.2 (Froyo)


  • ARM11, 600MHZ


  • GSM 900/1800/1900 MHz, UMTS 2100 MHz


  • 8.9cm(3.5 inch) 800*480 pixels WVGA resolution
    262K color (18 bit color) TFT
    Capacitive Touch screen


  • 3.2 MP Color CMOS with Auto focus


  • Flash: 512M
    Internal Memory: About 200 MB for user.
    Expandable with Micro SD memory card (up to 16GB)


  • Bluetooth™ with v2.1 with EDR
    Class 2 transmit power
    IEEE 802.11b/g compliant
    Internal WLAN antenna
    USB 2.0 with High Speed
    Micro-SD card access
    Support USB charging


  • 114mmx56mmx12.2mm

Advertised System Weight

  • 120g

Primary Battery

  • 1250mAh Li-ion

The phone will cost around RS:8000-10,500 .This is a very good phone for an intermediate user

Saturday, October 8, 2011

Mouse Controlling in Linux using Laser

Hi all

         Here is a code running on Ubuntu Linux which move the mouse cursor using laser point .The main library used for this code is XLib and Open CV.


#define SPACE XK_A        

#include <X11/Xlib.h>            
#include <X11/keysym.h> 

XKeyEvent createKeyEvent(Display *display, Window &win, Window &winRoot, bool press, int keycode, int modifiers)
   XKeyEvent event;
   event.display     = display;
   event.window      = win;
   event.root        = winRoot;
   event.subwindow   = None;
   event.time        = CurrentTime;
   event.x           = 1;
   event.y           = 1;
   event.x_root      = 1;
   event.y_root      = 1; 
   event.same_screen = True;
   event.keycode     = XKeysymToKeycode(display, keycode);
    event.state       = modifiers;
   return event;

CvCapture* VideoBuffer = cvCaptureFromCAM(CV_CAP_ANY);

uchar *Data;
int revert,Step,noPointerInterval = 0,i,j,k,XCordSum = 0,YCordSum = 0;
int RedPixelCount = 0,hold=0,noPointerFlag=0,blinkInterval=0,Width,Height;
  Display *display = XOpenDisplay(0);                           
  XKeyEvent event;                                       
  Window winRoot;                                        
  winRoot = XDefaultRootWindow(display);
  Window winFocus;                                       
  char num;
      printf("NO CAM FOUND!!!\n");
     IplImage* Frame=cvQueryFrame(VideoBuffer);

     Data=(uchar *)Frame->imageData;


                XWarpPointer(display, None, winRoot, 0, 0, 0, 0,(XCordSum/RedPixelCount)*2,(YCordSum/RedPixelCount)*2);

                XGetInputFocus(display, &winFocus, &revert);

           if(noPointerInterval<=10 && noPointerFlag!=0)


                                XGetInputFocus(display,        &winFocus, &revert);
                 event   =   createKeyEvent(display,   winFocus,   winRoot, true, SPACE, 0);
                 XSendEvent(event.display,   event.window,   True, KeyPressMask, (XEvent *)&event);  
                 event   =   createKeyEvent(display,   winFocus,   winRoot, false, SPACE, 0);
                 XSendEvent(event.display,   event.window,   True, KeyPressMask, (XEvent *)&event);



           if(noPointerInterval>10 && hold==0)
                  printf("\nNO pointer.");



Compiling Command

g++ `pkg-config opencv --cflags --libs` filename.cpp -o outputname



Saturday, October 1, 2011

LCD Clock using Arduino and Python

Hi all

         I made a simple LCD clock using Arduino .The code of Arduino and the Python for running the clock is given below .

Arduino Code

  LiquidCrystal Library - Serial Input
 Demonstrates the use a 16x2 LCD display.  The LiquidCrystal
 library works with all LCD displays that are compatible with the 
 Hitachi HD44780 driver. There are many of them out there,  and you  can usually tell them by the 16-pin interface.
 This sketch displays text sent over the serial port 
 (e.g. from the Serial Monitor) on an attached LCD.
 The circuit:
 * LCD RS pin to digital pin 12
 * LCD Enable pin to digital pin 11
 * LCD D4 pin to digital pin 5
 * LCD D5 pin to digital pin 4
 * LCD D6 pin to digital pin 3
 * LCD D7 pin to digital pin 2
 * LCD R/W pin to ground
 * 10K resistor:
 * ends to +5V and ground
 * wiper to LCD VO pin (pin 3)
 Library originally added 18 Apr 2008
 by David A. Mellis
 library modified 5 Jul 2009
 by Limor Fried (
 example added 9 Jul 2009
 by Tom Igoe 
 modified 22 Nov 2010
 by Tom Igoe
 This example code is in the public domain.
// include the library code:
#include <LiquidCrystal.h>
// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
void setup(){
    // set up the LCD's number of columns and rows: 
  lcd.begin(16, 2);
  // initialize the serial communications:
void loop()
  // when characters arrive over the serial port...
  if (Serial.available()) {
    // wait a bit for the entire message to arrive
    // clear the screen
    // read all the available characters
    while (Serial.available() > 0) {
      // display each character to the LCD
This program outputs the serial date to LCD .
The link of circuit diagram is given below
Python code 

import serial
import time
import datetime
#Opening serial port
while 1:
        tot_time="Time:"+hour+":"+minute+":"+second+"   Date: "+day+":"+month+":"+year

Thank you guys..:)

Sunday, September 25, 2011

Arduino and ROS

Hi all

      Here i interfacing ROS Electric with arduino .

ROS Electric Installation procedure in Ubuntu

After installing ROS Electric ,follow this procedure...
1)For Working with Arduino ,we have to load some programs  to Arduino .There is a library in ROS for arduino .After installation of ROS Electric you have to copy ros_lib from the ros folder to Arduino library folder.After that you have to load one sample program from the ros_lib.Here i upload a "hello world" program .

2)After uploading we have to load ROS commands
Thank you for watching......
For new arduino version > 1.0 ,we must edit ArduinoHardware.h inside roslib. Replace Wprogram.h into Arduino.h

How to Install ROS in Ubuntu

Hi all

ROS-Electric Installation procedure

Ubuntu 10.04 (Lucid)

  sudo sh -c 'echo "deb lucid  main" > /etc/apt/sources.list.d/ros-latest.list'

Ubuntu 10.10 (Maverick)

sudo sh -c 'echo "deb maverick  > main" > /etc/apt/sources.list.d/ros-latest.list'

Ubuntu 11.04 (Natty)

sudo sh -c 'echo "deb natty  main" >  /etc/apt/sources.list.d/ros-latest.list'

Set up your keys

wget -O - | sudo apt-key add -


Make sure you have re-indexed the server:

sudo apt-get update

There are many different libraries and tools in ROS. We provided four default configurations to get you started. You can also install ROS stacks individually.

Desktop-Full Install: (Recommended): ROS, rx, rviz, robot-generic libraries, 2D/3D simulators, navigation and 2D/3D perception

sudo apt-get install ros-electric-desktop-full

Desktop Install: ROS, rx, rviz, and robot-generic libraries

sudo apt-get install ros-electric-desktop

ROS-Base: (Bare Bones) ROS package, build, and communication libraries. No GUI tools.

sudo apt-get install ros-electric-ros-base

Individual Stack: You can also install a specific ROS stack (replace underscores with dashes of the stack name):

sudo apt-get install ros-electric-STACK

sudo apt-get install ros-electric-slam-gmapping

Environment setup

It's convenient if the ROS environment variables are automatically added to your bash session every time a new shell is launched:

echo "source /opt/ros/electric/setup.bash" >> ~/.bashrc
. ~/.bashrc

If you have more  than one ROS distribution installed, ~/.bashrc must only source the setup.bash for the version you are currently using.

If you just want to change the environment of your current shell, you can type:

source /opt/ros/electric/setup.bash

Check this link for more info

PyQT Tutorial:Introduction

Hi all

        PyQT is an easier way of creating User Interface .It has a power of both  Python and Qt.

What is Python
  • A high level Programming language 
  • An Object Oriented Programming Language
  • A scripting Language

  • Qt is a cross platform application framework for GUI Development
  • Qt stands for Qroll Tech.It is founded by Qroll Tech  now owned by Nokia

How PyQT Works

      Qt is used to make the User Interface file (.ui) .After making the user interface file(ui) ,converting it into equivalent python code .The code is generated using pyuic compiler .After modification some modification ,we can run the python code file ,

Requirements in Linux(Ubuntu )
  • Qt 4 Designer or  Qt4 Creator
  • python-qt4 : Python bindings for Qt4
  • pyqt-tools : pyuic and pylupdate for Qt3

Example demo 

1)Hello World Program using PyQt

Thank You for watching...

Wednesday, September 21, 2011

ROS and Urbi...

Hi all

      ROS and URBI are the two opensource platform Robotic libraries .
ROS =Robotic Operating System
URBI =Universal Real Time Interface


         ROS (Robot Operating System) provides libraries and tools to help software developers create robot applications. It provides hardware abstraction, device drivers, libraries, visualizers, message-passing, package management, and more.

Check this  link for more details


       Urbi is an open-source software platform to control robots or complex systems in general. It includes a C++ component library called UObject that comes with a robot standard API to describe motors, sensors and algorithms. Next to UObject, you can use the urbiscript orchestration script language to glue the components together and describe high level behaviors, a bit like python or LUA, but with embedded parallel and event-driven semantics to make the job easier.
The goal of Urbi is to help making robots compatible, and simplify the process of writing programs and behaviors for those robots. The range of potential applications of Urbi goes beyond robotics, since it has been successfully used in generic complex systems, where parallel and event-driven orchestration on multiple agents is the rule.
The latest versions of Urbi 2.x integrate support for Willow Garage's ROS. You can now use both systems together and benefit from the best of both worlds!
Urbi is open-source with an GNU AGPLv3 license. You can go to the Downloads section to get Urbi source code.
For more details check this link