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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 09:59:01 -0000
- Delivered-to: mailing list ukha_d@xxxxxxx
- Mailing-list: list ukha_d@xxxxxxx; contact
ukha_d-owner@xxxxxxx
- Reply-to: ukha_d@xxxxxxx
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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