from email@example.com contains these words:
the pneumatic ones, which have a very limited timing range with any
degree of reliablility, are not at all reliable in terms of longevity.
Expensive and unreliable. But I haven't found a less-bad answer to the
problem of a 20 minute timing requirement.
How about a shorter time?
The house I'm in now had an external push delay switch to light the
garden floods when coming in from the garage (at the far end of the
garden, and round a corner).
The switch has died and the rubber seal over the top has perished
(probably linked...) so I want to replace it. I can't easily use a PIR as
it would need to cover a narrow path over a distance, and be sensitive to
people walking directly towards or away from it, which they generally
I found a direct replacement (basically an indoor hydraulic switch with a
rubber cover and seal for the switch->surface box join in the 'exterior
fitting' kit) but that was almost £40 (!)
Any other ideas for a simple exterior push-on, delay-off switch with a
couple of minutes delay that can handle maybe 1000W of mains lighting?
from PCPaul contains these words:
My experience is that the pneumatic ones are much more reliable than
the electronic ones. The Elkay models of the old Columbus time delay
switch (Elkay 400) are OK in the middle of their setting range (around
5 minutes) and have a shroud available, but with the shroud you'll
probably end up paying around £30.
Why does the switch need to be OUTSIDE the garage?
And if it does have to be OUTSIDE, why don't you build a waterproof
housing for it -- simple box with a lift-up cover with magnetic flap to
hold it closed?
Because the lights are for the path from the back gate to the house,
which runs alongside the garage. You don't need to open the garage to be
using the path...
I could do but even getting a small plastic universal box and adding
flap, hinge, catch etc. to it will add up to the cost of the
weatherproofing kit bit.
It just seems like even the cheapest PIRs have a time delay switch built
in, so it's odd that there's no cheap outdoor proof switch (or even touch
switch - no mechanicals) with the same electronics in. Maybe I should
just build one... I'd do it with a 555 and a relay but stepping the mains
down to something useful in that application isn't cheap either.