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Sunday, March 12, 2017

New ROS book for Robotics Projects | Introduction to Robot Operating System | Programming robots using ROS | ROS Tutorials

Hi Everyone

I would like to announce my 3rd book, which is about Robotics Projects using Robot Operating System (ROS) which can be pre-order from following links

Here are the cover page and list of main projects included in the book

Here is a demo video of self-driving car project which is included in the book

Sunday, July 3, 2016

PyOverFlow : Automated solution searching for run time errors !!

Hi all

Here is one python package that i made for automating "stackoverflow-ing" when our code encounter run time errors. Using this package, we can retrieve top result from google and displayed on the web browser whenever an error comes.

We can also mention number of solutions we want, if any exceptions occurred. When an exception occurred, it will automatically search for the solution to fix the exception !!

Installing pyoverflow

The source code of the package is on the following link

  1. Extract the source code, and open a terminal in the extracted folder
  2. Use the following command to install this package, Note: Make sure that you have proper internet connection
  3. $ sudo python install
  4. Try the example code which is given below

Code 1

Thursday, December 31, 2015

Published my Second Book : "Mastering ROS for Robotics Programming"

Hi all

I am very glad to announce that my second book released and it is for teaching Robot Operating System. The title of the book "Mastering ROS for Robotics Programming". This is an advance book in ROS available on the market now.

The cover page of the book is given below

Mastering ROS for Robotics Programming
Mastering ROS for Robotics Programming

Buy book from Amazon Global :

Buy book from Amazon UK :

Buy book from Amazon India :

Book Website :

Saturday, May 30, 2015

Published a Book : "Learning Robotics using Python"

Hi all
     I couldn't blog in technolabz for one and half year, because i was busy with creating my Start up in Robotics called Qbotics Labs and writing my new book called "Learning Robotics using Python"
The cover page of the book is given below 

Learning Robotics using Python

About This Book

Design, simulate, build and program an interactive autonomous mobile robot

Program Robot Operating System using Python

Get a grip on the hands-on guide to robotics for learning various robotics concepts and build an advanced robot from scratch

Who This Book Is For

If you are an engineer, a researcher, or a hobbyist, and you are interested in robotics and want to build your own robot, this book is for you. Readers are assumed to be new to robotics but should have experience with Python.

What You Will Learn

  • Understand the core concepts and terminologies of robotics
  • Create 2D and 3D drawings of robots using freeware such as LibreCAD and Blender
  • Simulate your robot using ROS and Gazebo
  • Build robot hardware from the requirements
  • Explore a diverse range of actuators and its interfacing
  • Interface various robotic sensors to robots
  • Set up and program OpenCV, OpenNI, and PCL to process 2D/3D visual data
  • Learn speech processing and synthesis using Python
  • Apply artificial intelligence to robots using Python
  • Build a robot control GUI using Qt and Python
  • Calibration and testing of robot

In Detail

Learning about robotics will become an increasingly essential skill as it becomes a ubiquitous part of life. Even though robotics is a complex subject, several other tools along with Python can help you design a project to create an easy-to-use interface.

Learning Robotics Using Python is an essential guide for creating an autonomous mobile robot using popular robotic software frameworks such as ROS using Python. It also discusses various robot software frameworks and how to go about coding the robot using Python and its framework. It concludes with creating a GUI-based application to control the robot using buttons and slides.

By the end of this tutorial, you'll have a clear idea of how to integrate and assemble all things into a robot and how to bundle the software package.


Lentin Joseph

Lentin Joseph is an electronics engineer, robotics enthusiast, machine vision expert, embedded programmer, and the founder and CEO of Qbotics Labs ( in India. He got his bachelor's degree in electronics and communication engineering at the Federal Institute of Science and Technology (FISAT), Kerala. In his final year engineering project, he created a social robot, which can interact with people. The project was a huge success and got mentioned in visual and print media. The main feature of this robot was that it could communicate with people and reply intelligently. It also has some image-processing capabilities, such as face, motion, and color detection. The entire project was implemented using the Python programming language. His interest in robotics, image processing, and Python began this project.

After graduation, he worked at a start-up company based on robotics and image processing for 3 years. In the meantime, he learned famous robotic software platforms—such as Robot Operating system (ROS), V-REP, and Actin (a robotic simulation tool)—and image processing libraries, such as OpenCV, OpenNI, and PCL. He also knows about robot 3D designing, embedded programming on Arduino, and Stellaris Launchpad.

After 3 years of work experience, he started a new company called Qbotics Labs, which is mainly focused on research to build great products in domains such as wearable technology, robotics, machine vision, green technology, and online education. He maintains a personal website ( and a technology blog called technolabsz ( He publishes his works on his tech blog. He was a speaker at PyCon2013 India, and he spoke on the topic of learning robotics using Python.

Tuesday, September 3, 2013

Talk at PyCon2013 India : Slides and Codes

Hi all

     I have talked at PyCon2013 India about application of python in Robotics. Given below the slides and Sample Codes. I have demonstrated a ball tracking robot working on ROS and OpenCV. 

Wednesday, July 10, 2013

C++ Tips : Pointer to a Function

Program showing the usage of Function Pointer

 name : main.cpp  
 Calling a function using function pointer  
 #include <stdio.h>  
 int main()  
      int display();  
      int (*func_ptr)();        ///Declare function Pointer  
      func_ptr = display;        /// Assign address of function  
      printf("\n Address of function display is %u", func_ptr);      ///Printing Address of function  
      (*func_ptr)();          /// Invokes the function display  
      getchar();            ///Get char for seeing the output  
      return 0;  
 int display()  
      puts("\n Hello World !!\n");  
      return 1;  


Monday, July 8, 2013

Configuring XAMPP and Setting Wordpress , Drupal ,Joomla and sNews

Hi all

 I am giving the procedure for configuring XAMPP

1. I followed the procedure from the following link



Sunday, June 30, 2013

How to solve "openni_tracker [ERROR]: Find user generator failed" on ROS

Hi all

  When you install OpenNI library on ROS Fuerte/Groovy, you might be get the following error. I am using Ubuntu 12.04 64 bit.

openni_tracker [ERROR]: Find user generator failed

Here are some solution in which we can solve this issue

Solution 1: