RE: Checking whether a TV is not on

["Paul Gordon" <paul_gordon@xxxxxxx>]

I had one of these sensors on my TV for the last 4 years, and in all that
time, I could *never* get it to descriminate between fully on, and on in
standby, and even worse, it never actually detected the set being switched
off by its hard on/off button on the front panel...

The only thing it did detect was the set being switched off/unplugged at
the
wall socket....

I wouldn't recommend this device for this application...

I have heard mention before of various techniches for detecting the on
status of a TV, often involving using the headphone socket, or perhaps a
spare SCART socket... - presumably detecting the presence or otherwise of
an
audio or video signal, or maybe one of the SCART status pins... Keith D
will
know much more about what's possible with this approach....

Paul G.



>From: "Kevin Hawkins" <lists@xxxxxxx>
>Reply-To: ukha_d@xxxxxxx
>To: <ukha_d@xxxxxxx>
>Subject: RE: [ukha_d] Checking whether a TV is not on
>Date: Mon, 13 Oct 2003 13:12:17 +0100
>
>There are some current sensor type probes available that can tell you
via a
>'logic' type output whether any mains powered device is ON or OFF. LA I
>think do them as do the Comfort people - and I think maybe Xantech ??
>
>The mains cable needs dividing such that only one of the conductors
(live
>OR
>the neutral) passes through the sensor, which is a small current
>transformer
>- (looks like a large polo mint).
>
>The sensitivity of the ONOFF sensing can be adjusted by how many loops
of
>the mains wire are made around the current transformer (polo mint).  In
>your
>case of a device like a TV that always draws current (even in standby)
you
>will need to experiment such that it shows OFF in 'Standby' but 'ON' in
>use.
>I guess the sensors provide a spec as to what minimal current turns
them to
>the ON state (with a single wire pass through the sensor) - and you
could
>check this against the current drawn in standby by your TV, which must
be
>less than this or the device would show ON permanently.
>
>	Kevin
>
>
>
>    > -----Original Message-----
>    > From: Ian Tresman [mailto:ian@xxxxxxx]
>    > Sent: 13 October 2003 12:03
>    > To: AutomatedHome UK
>    > Subject: [ukha_d] Checking whether a TV is not on
>    >
>    > There are X10 devices that will tell me whether a device is on
or
>off.
>    >
>    > But is there anything that will tell me electronically whether
a TV
>is
>    > not
>    > on, ie. off, or on standby?
>    >
>    > And then is there anything that will allow the remote
switching of a
>TV
>    > (or
>    > other device) to stand-by mode?
>    >
>    > Regards,
>    > Ian Tresman
>    >
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