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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 10:18:38 -0000
  • Delivered-to: mailing list ukha_d@xxxxxxx
  • Mailing-list: list ukha_d@xxxxxxx; contact ukha_d-owner@xxxxxxx
  • Reply-to: ukha_d@xxxxxxx

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....
-----Original Message-----
From: Ian Lowe [mailto:ian@xxxxxxx]
Sent: 16 February 2002 09:59
To: ukha_d@xxxxxxxSubject: RE: [ukha_d] Swish K400 control

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.
-----Original Message-----
From: Stuart Whyte [mailto:lists@xxxxxxx]
Sent: 16 February 2002 09:55
To: ukha_d@xxxxxxxSubject: RE: [ukha_d] Swish K400 control

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
-----Original Message-----
From: Ian Lowe [mailto:ian@xxxxxxx]
Sent: 16 February 2002 01:51
To: ukha_d@xxxxxxxSubject: RE: [ukha_d] Swish K400 control


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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