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Iot4.eu
Interesting but moneygun.gif
That'd be close to 300EUR for what I want to do (and not much cheaper if I didn't worry about humidity). I like the idea of monitoring barometric pressure too, will add one of those to my list for the outside monitor.
Humidity sensors aside, I was planning on spending about 30EUR on the lot (already have a spare RPi to act as the 1-wire host). A bunch of DS18B20's, a 100m reel of 3 core cable, some heatshrink, zipties and a lot of swearing. Also means I don't use up a power socket or two in each room I want to monitor anything in. For now I was just going to isolate and remove the existing alarm system (we've long since disabled it) as it has a bunch of 3-core cables going to various most corners of the flat.
If we ever get this flat rewired then apart from Cat 6 everywhere I'd also spec out a proper 1-wire architecture at the same time, that would simplify things a lot if the cables were already in the walls all going back to a central point.
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Greenbank
Stonehedge
I'd really recommend going down the Iot4.eu route for this. Buy 4 or 5 of their wifi temp sensors, and they will do all the logging for you automatically to thingspeak including graphing and csv extracts of your data.
The IOT4 sensors use DS18B20 as their thermocouple.