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RRDTool Graphs – refining Color Temperature Gradients

Monday, May 28th, 2012

So, what happens when you have a ‘hole’ in your RRD data source upon which you base a color gradient?   RRD Graph – gaps in data – attic-temps-Zone-Y   The first version of this graph used a gradient peak that was two points above the peak – but the holes were still there… The 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 →

Long 1-Wire (MicroLan) networks

Thursday, July 21st, 2011

Long is, of course, relative…  After much tinkering/testing with Arduino and 1-Wire networks I discovered what seem to be some limitations: using an Arduino Uno I reached a maximum of 54 sensors on a large bread board – add sensor #55 and the network stops working when using parasite power on my ‘real lan’, during Continue reading →

Radiant Barriers – do they work?

Tuesday, July 19th, 2011

I like data – in fact, I prefer data based decisions over any other approach; as a consumer, however, I tend to rely on vendors (probably what most of us do.)  Well, sometimes finding the right vendor for a particular problem is quite challenging – I had to resolve this one on my own over Continue reading →

Arduino + 1wire + multiple MicroLans?

Monday, July 11th, 2011

How many 1wire (one wire) networks can be connected to Arduino? I will guess that this is relatively simple – since Arduino has multiple ‘pins’ you could have one MicroLan per pin (with appropriate power levels, connecting circuits, etc.)  The good news – you only need one device per ‘network node’ to do a basic Continue reading →

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