Originally posted by SarrissUK
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I use mrtg https://oss.oetiker.ch/mrtg/for the graphs. It is free software meant for graphing network traffic, errors and so on. But it only really graphs *numbers* and as I have said before I use a little computer to control heating cables and lights so that computer knows the temperature numbers. It's just a case of stitching to two together.
If you are interested in the details (hardware, programming language etc) I plan to write it all up for an article at some stage. Let me know and I will send you a draft when it's ready.
you'll be checking several times a day to check for any changes 

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