Holes in the Bedroom Wall

I caught up my HA plans a bit this weekend. Apart from spending a day PIDing my Silvia, I also spent some time completing the half temporary main bedroom install.

The ceiling modules have already been experimentally fitted. The completion of this room required replacing the main light switch with a DRB-001 and fitting the door switch. The current wall box was one of those 12mm shallow types, the DRB requires 25mm at least, ideally more like 37mm to allow a bit of room to tuck wires away. So a bit of hammer and chisel was required. For hacking out into stone-built walls, my friendly electrician recommended one of these:

chisel.jpg

It's got a technical name that I can't recall, but the important thing is that it has a comb-like blade. These are really effective for chipping away at the stone without shaking the plaster off or splitting the entire stone. They do send small fragments of stone *everywhere*, so wear eye protection and close adjacent doors, cover stuff up, etc.

The door switch is a small reed relay unit, I use these ones from Rapid Electronics (they seem a bit better made than the Maplin ones):

door-switch.jpg

The part number is 78-0797. They fit a nominal 8mm bore, but that sometimes seems a bit tight. 8.5mm, of course, is then a little loose, but a turn of electrical tape sorts that out. It's tricky, but essential, to get the bore drilled square, otherwise the flange will not sit flush and looks a bit messy. When I remember, I counter-bore a 13mm hole before drilling the main hole, this allows the flange to recess a bit. I think I could fill and paint this and it will become practically invisible:

door-magnet.jpg

Of course, I had to be really careful about setting up the bedroom lighting. Usually I like to have the operating period start from around 7am and run through to past midnight. This includes the whole day to allow for cloudy days when the light level can sometimes drop to an uncomfotable level. However, it is essential to ensure that the bedroom lights are free of any anomalous illumination. The safest way is to set quite an aggressive operating period to ensure they won't come on automatically during any possible sleeping times (note the substantial lie-in allowance) :

light-behaviour.png

Later on I'll explore rather more sophisticated algorithms using macros to detect "getting up" behaviours and then allowing the light to come on earlier. This is going to be interesting, since Tamzin prefers the very gentle introduction of light into her waking day and between us we have quite variable getting-up times. I also think I'm going to add a couple of bedside light points with dimmer control. Originally I was planning on using a couple of X-10 lamp modules, but I think that, in this case, a more permanent installation will be fine.

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This page contains a single entry by David published on February 14, 2006 7:12 PM.

How Orange are Idratek Modules ? was the previous entry in this blog.

Permanently PIDing my Silvia is the next entry in this blog.

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