Computing stuff tied to the physical world

Ceiling mount – first step

In Hardware on Jan 25, 2010 at 00:01

As promised, the foam board construction – well, a first step anyway:


The “folds” are a bit ugly this way, I’ll hide them on the inside using V-cuts in the next version.

Room node and battery pack included for size comparison. You’d think they fit easily inside, but the battery pack is surprisingly tricky, given that the room node needs to stick through the slanted side facing outwards.

The “walls” are also a foam mockup I’m using to avoid having to use an actual ceiling corner :)


Here’s how I intend to to place everything inside:


The battery pack will be attached to the top, i.e. flat against the ceiling. The room node will be mounted such that the PIR sensor sits in the middle, sticking out.


  1. Hi

    Verry nice an interesting design idea. I would also add a loader plug, so you do not need to open it once the battery is empty.

    • NiMh/NiCd batteries often have a fairly high discharge rate (empty within a few weeks) – I wouldn’t recommend them in this context. Hopefully this unit will be pretty easy to open up – not there yet…

  2. Looks quite nice, actually. I like it. Probably not disturbing anyone or anything up there. Only thing what came into my mind that temperature may be a little bit higher close to the ceiling than on eye level. I’m actually not sure, just guessing. But if it is so, it can be taken into account in the readings.

    • Good point – temp & humidity readings will not be optimal. I may add one or two 1-wire sensors to one unit, down the wall, at eye and floor level perhaps, to get an indication of the temperature gradient.

  3. Maybe ditch the battery pack to save space, use clips or something? Since you’re making an enclosure — the ceiling mount — perhaps it’ll work out smoother if you’re not mounting enclosures w/in other enclosures?

    Looking forward to seeing this evolve!

    • I’m afraid clips won’t make enough of a difference, it’s just that rectangles are a very awkward fit inside triangles, especially slanted ones!

  4. Jcw: >NiMh/NiCd batteries often have a fairly high discharge rate >(empty within a few weeks)

    Did you try the newer “Ready to Go” batteries, like eneloop ? The claim to have a low self discharge rate.I already use them but I have no experiences in such a low power enviroment.

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