Monday, 31 December 2012

KiddiePi: It's childs play!

Actually, strike out the word "play" from above.

By watching my own kids, and now my grand-children, I've come to the conclusion that very young children are pre-programmed to EXPLORE the world via touch, taste, smell and hearing, while play and learning are just by-products.

 

Children, especially under 3 year olds, just soak up information like a dry sponge in a shower.


This post presents some of my ideas on creating a simple computer based "toy" to engage very young children, which will hopefully develop as they do.

Thursday, 13 December 2012

External Drive Network Share on Linux

If you have a home server or just a box that is left on most of the time, you may want to add an external drive and share the contents over the network.


This post is written for Lubuntu using an attached memory stick, but you should be able to follow this procedure for other Linux distros.


Lubuntu is a light-weight Linux distro, so you may find there are packages missing which are required for proper network operation. Consequently, I suggest you set your Lubuntu box for networking using the method I've detailed here.

Saturday, 1 December 2012

Clonezilla, its not really that scary!

Whether you are running Linux or Windows, its a good idea to clone your system before upgrading your system software, or doing anything that may brick your system.

Its easy to create a clone of your current system which you can then use to re-image your computer, in the event of a problem.


However, it should go without saying that re-imaging is a destructive process. The whole computer hard drive is going to be re-written when you restore an image.

Wednesday, 21 November 2012

MakerBot Replicator: Print Quality #2

Having upgraded the Replicator's firmware, I was able to run a couple of test prints using acceleration.


This allowed me to print a TreeFrog in under 30 minutes.


Following on from my previous posts on the Replicator and Print Quality, I wanted to try a print with acceleration. But my first problem was locating the acceleration mode on the Replicator...
...it didn't have one.

Friday, 16 November 2012

MakerBot Replicator: Print Quality

What level of print quality can you expect from your new MakerBot Replicator?

 

Here are a few illustrations which I hope might help show the sort of results you can expect from this model of 3D printer.


...Or maybe you get better results, in which case, I have a problem!

Having levelled the Replicator platform and left all other settings at their default values (e.g. nozzle & platform temperatures) I selected the "whistle" from  the ReplicatorG software example list as a test piece.

Wednesday, 14 November 2012

The 3D Printer: Toy or Techno-Wonder?

I was lucky enough this week to get my sticky little hands on a 3D printer: the "MakerBot Replicator".  So what's all the fuss about?


First impressions are that this printer has been built using old parts from a flat-bed scanner, and housed in a primitive, makeshift, wooden chassis.


But on closer examination, the chassis is in fact a very sturdy structure, closed at the base and the back, but open on the other four sides.

Friday, 9 November 2012

Recovering Lost Files With Linux

Unfortunately data loss and corruption are common ailments in memory devices such as hard disk drives, solid state memory cards and USB sticks.


It doesn't matter if your faulty device is a memory card from your camera, or a hard drive from an Apple Mac or a Windows PC, all may not be lost if you can connect the device to a computer and use a couple of magical Linux tools.


The other day I was handed an SD card, which should have contained the record of a great holiday in Egypt. There were a few jpeg files listed in file manager, but they would not open, and many seemed to have a file size of 0 bytes.

The outlook was gloomy (as was my well-tanned friend) but in just a few minutes I was able to restore over 200 happy holiday snaps.

Wednesday, 7 November 2012

Gambas: Improving the PhotoViewer

By making the transition from Gambas 2 to Gambas 3, I've been able to increase the functionality of my Photo Viewer application, and make a few improvements along the way.

 

A new Gambas component has allowed me to add image histograms, rotation and normalisation to my project.


This new component is called gb.image.effect, and although it includes methods to despeckle, emboss, invert, oil-paint and solarize an image, I've only made use of a couple of the available methods.

Friday, 2 November 2012

When The Dishwasher Runs Dry

When your dishwasher stops washing dishes, you better fix it fast, or spend hours up to your arm-pits in soapy water, doing the washing up!

 

Our dishwasher started running "dry", a problem I had seen 3 years ago, so I knew just what to do.


Like most dishwashers, our Bosch LogiXX gets a lot of crap thrown at it. But the two most difficult substances for it to swallow are fruit pips and fat. The pips are usually from oranges and lemons. They whiz around the internal pipe-work until they get stuck in those rotating arms that are supposed to spray water over your crockery.

Friday, 26 October 2012

Gambas is no shrimp

It may mean "prawn" in Spanish, but in the world of computing, Gambas is a visual programming language for Linux.

 

The Gambas application is an integrated development environment (IDE) which not only allows you to create, edit, run and debug your software, but also create executables (programs) and package them for distribution and deployment to other Linux computers.

 

This post does not cover the Gambas language in any detail, its more of an over-view which takes you through the whole process of creating an application, from writing a very simple program to creating a deployment package.

Gambas is more than just a language, it is also a rapid application development system, making it an ideal starting point for those wishing to learn programming or for programmers taking their first steps with Linux...

Wednesday, 17 October 2012

Giving Your Computer A Voice

I've found it very helpful in a few cases to add audible alarms to monitoring functions. For example, if you work in a network support environment and a server goes down, you need to know about it straight away.......preferably before your phone goes into melt-down!

 

By using text-to-speech, you can monitor several aspects of your working environment without having to continually check display screens.


I recommend eSpeak, which is a compact, cross-platform, open source software, speech synthesiser. Although the sound is not as natural as that produced by a system based upon human recordings, its very small size makes it a good choice for small devices, the Raspberry Pi and for applications producing announcements.

Thursday, 11 October 2012

Networking: With Lubuntu, Win7 and the Raspberry Pi

Setting up a home peer-to-peer network can be challenging, and for machines with a variety of operating systems, can be even more tricky.

 

The three examples given may also help with other version of Linux & Windows.


Wednesday, 10 October 2012

Photography: #1 Exposure Explained

When you make the transition from "point and shoot" to SLR photography, there is one very important subject you really need to get to grips with:-

      ***   Exposure   ***

 

Using an SLR camera in "manual mode" puts you in total control, not only of composition and focus, but also exposure.


When you take a photo, you allow light into your camera. Assuming you are using a "digital" camera, the light reaches a "photo-sensitive sensor" which produces an electrical output, and ultimately this is processed into a picture. If this picture is correctly "exposed" it will not be too dark or too light.

"So what's the problem..." I hear you say,  "...if its too dark or light I can just use the Gimp or PaintShop Pro to adjust the brightness?"
The problem is that you will lose detail if your initial photo is too dark or too light. Adjusting the brightness will not recover that lost detail.

Sunday, 7 October 2012

How to diag Windows/computer problems with a LiveCD

You have a problem with your Windows computer and wonder whether its hardware or software. You've tried all the obvious stuff, so what do you do next?


Well before you invest in more RAM, a new hard disk, or take your computer to your local friendly repair man, there is one more thing you can try.


If you boot your computer from another operating system (OS), you effectively get a second opinion. You can do this by downloading a Linux distribution and creating a LiveCD from which you boot your computer.

Sunday, 30 September 2012

Gambas: #1 PhotoViewer

Does the world need yet another Photo Viewer application?

 

I doubt it. But I needed something which would help with my photographic work-flow, so I wrote my own.


With three keen SLR camera users in our house, I noticed that at least two of us were following a similar process. Once we had transferred our photos to our Linux powered laptops, we would:-
  1. Review each photo in turn
  2. Delete the "no-hope" pictures
  3. Rename any we wanted to keep that did not require edits
  4. Launch GIMP for those that did require edits
  5. Show our best efforts to long suffering friends & relatives
  6. Review camera settings when asked "How did you do that?"

So I set about making a new Photo Viewer application using my language of choice: Gambas









PhotoViewer running on Lubuntu


Saturday, 29 September 2012

Using a BirdBox Camera: #1 The Basics

Small surveillance cameras have never been cheaper, so why not spy on the great tits in your garden?

As the bird box season in southern England kicks off late February/early March, you need to start to plan NOW for the 2013 season!

 

Why do it?

Although you won't get the kind of quality pictures we see on BBC programs like Springwatch (http://www.bbc.co.uk/springwatch), installing a cheap camera in your garden bird box will give you a special insight into the lives of some of your little feathered friends. Following the process of nest building, egg laying, feeding the chicks and finally fledging, can be a rewarding experience for young and old alike.

Wednesday, 19 September 2012

Lubuntu: Making Friends With Terminal

If you have no interest in your Lubuntu computer beyond using it for regular tasks (e.g. email, web, photo-editing) then you can stick to using graphical user applications that you pick from the system menu. That's fine! There is really no point in making your life more difficult than it is already!

 

However, if you want to look a little deeper into the workings of your system, there is no better place to start than at the terminal.


Why on earth would you need to use low level commands like "cd", "ls" and "mv" if you have a very capable GUI file manager, such as PCManFM?

Well, most of the time you would try to steer clear of "the dark side" and use a GUI app. But what if your system is broke and it wont boot to the desktop? You might be able to edit files and bring the poor old dear back to life via the command line interface, if only you knew how!

Warning: A Raspberry Pi is not a Raspberry Pie!

I feel compelled to write a few lines about this, as a result of widespread confusion and the increasing number of accidents reported relating to this issue.


Much of the blame for this confusion, I believe, is due to two factors:-
  1. Many people now buy most of their kit and provisions from the inter-webbie.
  2. The level of literacy is at an all time low. The inter-webbie is littered with typographical errors, poor spelling and bad grammar.

"guysand that, dont evun like talk proppa, like whot they yous too indie ole dais!"

A Raspberry Pie is a cordless device which can be purchased ready made (you just have to apply some power) or can be constructed by a DIY enthusiast from RAM (readily available material).

Friday, 14 September 2012

What is Lubuntu and why would I use it?

You are probably reading this on a netbook or an iPad, or maybe a smart phone, or maybe one of dozens of other devices. All of these devices have 2 common attributes; they include "hardware" and "software".


The hardware is the bit you hit when it won't do what you want it to do. The software is the reason it won't do what you want it to do.

Software, of course, is invisible but you can see the effects of it on your hardware. For example; it lights up the display and responds when you click an icon (sometimes). So in order to get your cold hardware to do something, you need software.

Wednesday, 12 September 2012

The Marvelous Magimix

Disaster struck in the Bodgit house last week when Lady Bodgit announced that the Magimix had stopped mixing. I say "disaster" because without it, production of LB's delicious fruit cake came to a halt.

I'd noticed that the rotating blade had been difficult to remove the last few times that the Magimix had seen action, and had advised the use of Extra Virgin Olive Oil to free it from the rather misshaped motor spindle.

However, the spindle was now spinning, but the blade was not. So it was beginning to look like a new (and expensive) mixer was required.