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Creating A Custom Hot to Cold Temperature Color Gradient for use with RRDTool

Wednesday, May 9th, 2012

It seemed like a simple idea – write a script to generate a color gradient (hot to cold, i.e. Violet -> Red -> Orange -> Yellow -> Green -> Blue) that I could just ‘plugin’ and use. After spending some time with this the solution is simple a custom choice.  I found that some gradients Continue reading →

Creating Color Gradients with RRDTOOL & Bash (using temperatures)

Thursday, May 3rd, 2012

You would think that it would be easy to locate just about any information on the Internet but that’s simply not true.  While I found many examples (using various approaches) of generating graphs with gradients using rrdtool I did not locate any dynamic solutions, i.e.: I have data in multiple RRDs, I need to extract Continue reading →

Reading DS18B20 Temperature sensors with DigiTemp

Wednesday, April 25th, 2012

Over the past several months I have collected quite a number of temperature readings from a custom sensor network.  I started with ~30 sensors and maxed out at ~42 sensors (due to limitations/quirks of 1-Wire protocol/networks.)  For background on this project visit the related posts. I am using Digitemp because it simply works – but Continue reading →

Getting git in 15 lines (more or less)

Thursday, December 8th, 2011

Figuring out how to use a new tool can be challenging – the notes below include some examples of my exploration with ‘git’. Note that Git is designed as a distributed version-ing system – you are the only one editing your LOCAL copy of the files and you share your changes when you ‘push’ them Continue reading →

Converting HTML to Markdown via Pandoc

Monday, November 28th, 2011

In the fall of 2011 the hosting for the Open Source Cobbler project (an automated system provisioning tool for bare metal or virtual machines) is transitioning to GitHub.Com from FedoraHosted.Org.    The (wiki) documentation for the project is available as HTML.  GitHub can support HTML but also provides support for Markdown (a ‘pure text’ means of providing Continue reading →

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