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RE: Swish K400 control
- To: <ukha_d@xxxxxxx>
- Subject: RE: Swish K400 control
- From: "Ian Lowe" <ian@xxxxxxx>
- Date: Sat, 16 Feb 2002 20:54:20 -0000
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Title: Message
Well yes, but...
"are not intended "for
public consumption" but for his/my own particular needs"
"At the moment I don't want to speculate
what the
cost will be - and that's assuming it takes off!"
"The circuit isn't cheap to build and
the
boards won't be cheap to have made in limited quantities so the board will
not
be cheap
either"
availability of bodgeomatic relay solution:
now
cost of dodgy
relay
solution: £2.96 for relay, 1:50 for plug, £1 for bits, £0
for existing
AM10
Phil, I'm always
glad
to see something cool, but if this does what I need for very small amounts
of
cash, right here, right now,
then I'd be daft
not
too.
Ian.
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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