News of The Wolf

Random, hopefully interesting technical ramblings

Archive for the ‘Internet’ Category

Twitter Popularity Meter – Hardware

Posted by chemicaloliver on 07/10/2009

The hardware for the system discussed in my previous post consists of an arduino, arduino ethernet shield, 2x 595 shift registers and one 8×8 common anode LED Matrix from china via ebay. Basically the arduino requests the page containing the current popularity metric and then adds it to an array containing the states of the currently lit LEDs which is then pumped out to the shift registers to update the display. The circuit lights the correct LEDs.

The circuit design is based on a design featured on the arduino playground for lighting 8 LEDs but was slight adapted to deal with the matrix.
schematic

I have also attempted to form this into a new arduino shield so I can reuse the LED matrix circuit quickly for other projects, a PCB is currently with BatchPCB

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Twitter Popularity Meter – Code

Posted by chemicaloliver on 06/10/2009

Recently I’ve been working on a popularity meter which searches twitter and displays a bar graph of the popularity of the search term on an LED Matrix driven by an Arduino. It currently relies on a PHP script on my webserver to do the actual twitter search and the arduino reads the page via ethernet and then displays the number on it bar graph.

Arduino Twitter Meter

Arduino Twitter Meter


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Writing a GUI in Processing

Posted by chemicaloliver on 15/05/2009

When I first started looking into the Processing language it is quickly apparent that out of the box there is very little in the way of handling user input by way of GUIs. This has been rectified in a very nice way by the team who developed controlP5 this is in my opinion the easiest GUI library I’ve ever used enabling me to create sliders and knobs in a matter of minutes, having programmed very little in processing before. What I came up with is the start of the interface for my planned ardunio controlled synth system:

My controlP5 GUI example

My controlP5 GUI example

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Choosing a host…

Posted by chemicaloliver on 13/05/2009

So I decided I wanted to start a blog, I have a few interesting projects I believe other people in the community would be interested in reading about as I read many blogs of similar projects everyday and am inspired by new ideas presented by normal people. However that raises the question of how best to do it?

Being an ambitious currently unemployed  Computer Science graduate I felt I wanted somewhere to showcase my skills, instantly a paid for hosted site seemed like the obvious option. After many hours of research I came the conclusion it was too difficult to sift through to find the most reliable company, all cheap options seemed to have a large selection of terrible reviews except more expensive companies and the free ones like wordpress and blogger. WordPress and blogger and other similar systems don’t have the same vulnerabilities as shared hosting and I’m not paying for the privilege of being annoyed by bad service which seems ideal. When  decide I something worthy to show using a paid for site I will pay a bit more and have a decent service but for now viva la free blogs!

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