Ketan's Home

November 29, 2015

Make a Fully Functional Hobby Rocket Out of Household Items

Filed under: Uncategorized — Tags: , — ketan @ 4:27 PM

If you’re looking for something fun to work on over the weekend, this homemade rocket build is made mostly from household items and is super cheap to put together.

Read more…

from Lifehacker

This VU Meter is Built Into the Speaker

Filed under: Uncategorized — Tags: , — ketan @ 10:39 AM

Depending on the music you’re listening to, watching a VU meter bounce to the music is always a good time. So why not integrate the VU meter right into the audio source? That’s what [Matikas] did, and it’s pretty fantastic.

He started with a pair of speakers he had and picked up some NeoPixel LED strips. Carefully wrapping the LED strips around the inside circumference of each speaker, the LEDs fit behind the speaker grills, giving it a cool effect when they’re on.

To control the LEDs, he’s using an Arduino Uno (Atmega328p) which measures the audio level in order …read more

from Hackaday

November 27, 2015

Control Your HTPC With Scavenged IR Parts

Filed under: Uncategorized — Tags: — ketan @ 8:26 AM

If you’ve built yourself a home theater PC, one of your highest priorities is probably coming up with a convenient control solution. The easiest way to do this is to simply use something like a wireless keyboard and mouse. But, that’s not very conducive to an enjoyable home theater experience, and it feels pretty clunky. However, if you’ve got the right components lying around, [Sebastian Goscik] has instructions and an Arduino sketch that will let you control your HTPC with any IR remote control.

There are a number of ways you could control your HTPC, and we’ve featured more than …read more

from Hackaday

November 26, 2015

Teach Your Kids to Code with One Hour of Minecraft Puzzles

Filed under: Uncategorized — Tags: , , — ketan @ 5:25 PM

winningHour of Code is a workshop-based learning experience meant to introduce kids to the joy of coding.

Read more on MAKE

The post Teach Your Kids to Code with One Hour of Minecraft Puzzles appeared first on Make: DIY Projects, How-Tos, Electronics, Crafts and Ideas for Makers.

from Make: DIY Projects, How-Tos, Electronics, Crafts and Ideas for Makers

November 15, 2015

Top 20 Core Java Interview Questions and Answers from Investment Banks

Filed under: Uncategorized — Tags: — ketan @ 11:46 AM

This is a new series of sharing core Java interview questions and answers on the Finance domain and mostly on big Investment banks. Many of these Java interview questions are asked on JP Morgan, Morgan Stanley, Barclays or Goldman Sachs. Banks mostly asked core Java interview questions from multi-threading, collection, serialization, coding and OOPS design …

from Java Code Geeks

Microservices: The Essential Practices

Filed under: Uncategorized — Tags: , — ketan @ 10:17 AM

Before we jump and try to explore the practices we must master in order to successfully implement microservices architecture, let us briefly refresh our understanding of monolithic applications. Monolithic Applications Monolithic application is built as a single unit that, with time, increases its size. While the increase in features is bound to result in increase …

from Java Code Geeks

JPA Many-to-Many association in SQL and NoSQL databases under Payara

Filed under: Uncategorized — Tags: — ketan @ 2:17 AM

1. Introduction In this article we will explore the JPA bidirectional @ManyToMany association in a SQL and NoSQL fashion. A @ManyToMany association occurs when multiple records in one table, each correspond to multiple records in a related table. If the records from the second table have an inverse association back to the first table, we …

from Java Code Geeks

November 7, 2015

Remote versus Co-located Work

Filed under: Uncategorized — Tags: , — ketan @ 2:13 AM

from Martin Fowler

November 3, 2015

Escape Cable Hell with an Audio I/O Multiplexer

Filed under: Uncategorized — Tags: , — ketan @ 7:27 AM

If you ever find yourself swapping between a mix of audio inputs and outputs and get tired of plugging cables all the time, check out [winslomb]’s audio multiplexer with integrated amplifier. The device can take any one of four audio inputs, pass the signal through an amplifier, and send it to any one of four outputs.

The audio amplifier has a volume control, and the inputs and outputs can be selected via button presses. An Arduino Pro Mini takes care of switching the relays based on the button presses. On the input side, you can plug in devices like a …read more

from Hackaday

November 2, 2015

Are You Telling Me You Built A Lexus…Out Of Cardboard?

Filed under: Uncategorized — Tags: — ketan @ 7:30 AM

So, you want a new Lexus? Well then download yourself a free car, and cut it out on a laser. Add some glue, and bingo, you have yourself a fancy new ride. We’ll, not really.

Sure, this promo video is just a publicity stunt from Toyota (News flash: Your fancy Lexus is actually a Toyota) but we have to hand it to them, it worked. It’s basically 1700 individually shaped, laser cut cardboard cross-sections that are painstakingly stacked and glued together. What we like about this is the technique – that is making a 3D object from 2D.

Using 2D …read more

from Hackaday

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