How to setup WebREPL to connect to Python prompt (REPL) of ESP8266 over WIFI network?

216 views
By Abhijit Ghosh on Feb 23, 2017 2:05:33 AM

WebREPL daemon auto-start is disabled by default in MycroPython on ESP8266 for security reason. Here, we'll enable the same, connect to the REPL over WIFI using locally installed WebREPL client and run a "Hello World" program remotely on the chip.

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How to flash MicroPython firmware onto an ESP8266 ESP-12E chip using esptool?

461 views
By Abhijit Ghosh on Feb 4, 2017 12:01:35 PM

By default, ESP8226 module comes with AT Firmware. In this post, we'll see how to flash MicroPython firmware onto an ESP8266 ESP-12E chip using esptool.

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How to uninstall OpenCV (Open Source Computer Vision) from Raspberry Pi - Raspbian Jessie?

5,119 views
By Abhijit Ghosh on Jul 10, 2016 4:05:12 PM

To uninstall OpenCV (Open Source Computer Vision) from Raspberry Pi (Raspbian Jessie), follow the steps mentioned below in this article.

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Troubleshooting for Hue-Solr Integration

4,840 views
By Soumen Chandra on Jun 18, 2015 12:14:48 AM

Troubleshooting: Cloudera Hue not able to access Solr collections through Search tab assuming both are set up with CDH4

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4 Effective Tips to Reduce Your WordPress Database Size

5,581 views
By Jenny Richards on Jun 13, 2015 3:00:09 PM

Are you serious about speeding up your WordPress-hosted website? If so, chances are high that you have shelled out money for clutter-free codes or designs that will reduce your site's loading time. If you are like most Webmasters, you have eagerly devoured webinars, eBooks, and worksheets that teach you how to increase your site's speed. However, as it turns out, you might not need to pony up some dough!

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NRT (Near Real Time) Indexing using Cloudera Search And Lily HBase Indexer

12,265 views
By Soumen Chandra on May 19, 2015 8:44:33 PM

You are not so strong with SQL or you are not good at programming? And you need to create distributed scalable search on a very large dataset stored in HBase? And you need to achieve NRT (Near Real Time) indexing? Cloudera search along with Lily Hbase Indexer is there to rescue you!

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Cloudera Hadoop (CDH 5.x) Installation Guide

15,029 views
By Soumen Chandra on May 10, 2015 2:04:25 PM

It is affectionately said that what Oracle is to Relational Database, Cloudera is to Hadoop. Most of the Hadoop aspirants, at the beginning of their Hadoop development learning curve, fiddle with the setting up of CDH, some able to do it smoothly (Cloudera has put up an incredibly exhaustive installation guide), some requires to really sweat it out (few finer details and prerequisites are either missing or not enough emphasized upon) and very few actually gives it up losing their way in the verbose and cover-all-cases installation guide(multiple way of set up and different set of instructions for different linux OS; sometimes too much of variations for impatient starters). So there is a target audience for one more set up document which is leaner, meaner and streamlined with only one (the most preferred) variation. Try it at home!!

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Hadoop Hands on - A POC Covering HDFS API, MapReduce, JSON and AVRO SerDe, HBase API With FuzzyRowFilter usage

7,526 views
By Soumen Chandra on Apr 13, 2015 12:27:43 AM

My learning phase with Hadoop is still continuing. During this phase what I found is a great lack of a comprehensive POC which covers at least a few prominent Hadoop technologies. My POC can fill up that void. After having set up CDH4.7 in my laptop, I completed implementation of this POC touching HDFS API, MapReduce, JSON and AVRO SerDe, HBase.

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Install and Configure Oracle Java ME Embedded on Raspberry Pi

8,894 views
By Abhijit Ghosh on Mar 17, 2015 10:14:14 PM

Raspberry Pi is a low cost, credit-card sized and fastest selling personal computer. In this article, we'll install and configure Oracle Java ME Embedded on a Raspberry Pi.

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Design - a start-up approach to adopt developers' language

4,697 views
By Deb Kumar Basu on Mar 12, 2015 1:15:41 AM

I have to observe lots of developers as part of my job description. I sit back and stare at what they do all the time, how they communicate to each other, how they express their ideas and how easily they get into a fight in a design discussion.

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About this 'Hello World' site

This site is mainly developed to share coding and technology learning experiences on java / j2ee based technologies.

Simple tutorials / codes have been shared to learn a new technology. Full source code is also available for download.