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RE: Swish K400 control
- To: <ukha_d@xxxxxxx>
- Subject: RE: Swish K400 control
- From: "Phil Harris" <phillip.harris1@xxxxxxx>
- Date: Sat, 16 Feb 2002 19:19:48 -0000
- Delivered-to: mailing list ukha_d@xxxxxxx
- Mailing-list: list ukha_d@xxxxxxx; contact
ukha_d-owner@xxxxxxx
- Reply-to: ukha_d@xxxxxxx
Title: Message
Wouldn't you rather have something that closed when you sent it
an X10 "on" and opened on an "off" and didn't need all this pratting
about
with appliance modules and 240v relays?
Phil
Answered my own Question... the LDR drops from a good 800 ohms down
to about 100 ohms in daylight, and about 60 ohms with a fook off
spotlight glaring on it, so it's a pretty safe bet I would say that the
circuitry is designed to maintain a steady state of 60-100
ohms..
Just
tested the gubbins with a 90ohm resistor, and the switching works just
perfect.
:)
Now,
off to Craplins....
Hmmm, in that case, a low value resister in line with the relay
could
provide an extra degree of protection, if there was any issue... time to
pull apart my light sensor (unused) and figure out what the lowest value of
the LDR is in bright light.. that should give an idea of the designed
level...
Ian.
Just had another thougt on this. When the light sensor (LDR)
is in use <QUOTE>...the resistance falls as the light becomes
brighter...</QUOTE> therefor during the day the
resistance between control lines would be fairly low anyway, maybe not
quite dead short, but till low enough for the circuit to have to be able
to cope with the condition.
Stuart
Having more of a delve
here, there's still the potential for getting the
curtains caught in an
unknown condition...
If you send a "close" whilst an open is in
progress, or vice versa, it
stops.
This strikes me as exactly
what could happen if someone inadvertently issues
a web command, then
does an "oh-shit" and clicks the opposite... rather than
undoing the
mistake, it would leave the curtains "hung"
The document says
however, if the signal condition is maintained, then the
operation will
happen anyway..
It's all down to the electrics I suppose.. does a
perpetual "open" signal
stress some component, or does it behave well
when presented with a
"maintained for a loooooong time"
signal?
Time for some testing I suppose, although I find myself not
very inclined to
risk blowing one of these guys, given the unlikelihood
of getting it
replaced easily.
Stuart, did you notice whether
the curtains opened/closed on the drop or
rise of the 0V
pulse?
Ian.
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