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I'm really liking the YUN and will probably buy more of them, They're a lot easier to setup for reading sensors and using servos than Pi's in my opinion and I think Pi's are overkill on a lot of it. I have a crap load of Pi's and use them for all sorts of things - currently getting into telescope control rigs and astrophotography which is ideal for Pi.
You can SSH to the YUN, it has a micro sd slot - so for basic web reporting and whatnot it's ideal, at £60 is quite pricey - but I'm really liking them@hippy we've got two of these http://www.screwfix.com/p/lap-indoor-ceiling-flush-pir/47121 You can adjust them as well, we had to play with the timings a bit, for example the hall one turns off after about 10 seconds, as its generally just pass through traffic, whereas the toilet one stays on for 4 minutes, before it needs 're-activating'. The only problem we find is that the PIR in the bog is almost directly above the throne, and it seems to have a blind spot directly below, so sometimes some comedy waving ensues.
MOC has done all the wiring. They're basically just another light switch. I can probably get a wiring diagram off him if you want.
Interesting clefty. I am particularly interested in the YUN, not something that I have used. I am actually a bit torn between using very low-cost cut-down arduinos to do this, or going the whole way and using fully a fledged pi which in the grand scheme of things are still not overly expensive. It seems unlikely that we will go as far as zoning the heating, purely because of the amount of retro fitting that it would entail. We are adding a loft extension though, so potentially could add it there. How do you find the YUNs?