Hi.
I'm pretty sure that what I want to do is fine, but might someone with knowledge/experience of such matters please help by confirming?
I want to rig up an outdoor device actuated by PIR sensors. There will only be one device, but I'd like to have it respond to either of two sensors, to get broad area coverage. Is it as simple as wiring both sensor power outputs to the supply terminals of the device? Clearly, the device will only draw the power that it wants to draw, regardless of whether one, other, or both PIRs are activated. However, I'm not 100% sure whether standard outdoor PIRs (e.g. from Toolstation) might be designed such that the output terminals becoming live in the absence of PIR sensor activation would be a problem. This circumstance would occur if only one PIR is activated, since both outputs would be connected via the supply terminals on the device.

Cheers. Terry.

On 09/09/2015 08:42, wrote:
Hi. I'm pretty sure that what I want to do is fine, but might someone
with knowledge/experience of such matters please help by confirming?
I want to rig up an outdoor device actuated by PIR sensors. There
will only be one device, but I'd like to have it respond to either of
two sensors, to get broad area coverage. Is it as simple as wiring
both sensor power outputs to the supply terminals of the device?
Clearly, the device will only draw the power that it wants to draw,
regardless of whether one, other, or both PIRs are activated.
However, I'm not 100% sure whether standard outdoor PIRs (e.g. from
Toolstation) might be designed such that the output terminals
becoming live in the absence of PIR sensor activation would be a
problem. This circumstance would occur if only one PIR is activated,
since both outputs would be connected via the supply terminals on the
device.

Cheers. Terry.


You can parallel as many pirs as you like provided they are of the relay
type which most are. The toolstation ones I bought had relays.

The ones with solid state switches will also work if you can wire a
manual override switch to them as they can take mains on the output as
provided by the manual override switch.

dennis@home wrote:
On 09/09/2015 08:42, wrote:
Hi. I'm pretty sure that what I want to do is fine, but might someone
with knowledge/experience of such matters please help by confirming?
I want to rig up an outdoor device actuated by PIR sensors. There
will only be one device, but I'd like to have it respond to either of
two sensors, to get broad area coverage. Is it as simple as wiring
both sensor power outputs to the supply terminals of the device?
Clearly, the device will only draw the power that it wants to draw,
regardless of whether one, other, or both PIRs are activated.
However, I'm not 100% sure whether standard outdoor PIRs (e.g. from
Toolstation) might be designed such that the output terminals
becoming live in the absence of PIR sensor activation would be a
problem. This circumstance would occur if only one PIR is activated,
since both outputs would be connected via the supply terminals on the
device.

Cheers. Terry.


You can parallel as many pirs as you like provided they are of the relay
type which most are. The toolstation ones I bought had relays.

The ones with solid state switches will also work if you can wire a
manual override switch to them as they can take mains on the output as
provided by the manual override switch.
Virtually all have relays in now as it removes any issues with triacs
not liking certain types of load.

On Wed, 09 Sep 2015 13:31:49 +0100, Bob Minchin wrote:

dennis@home wrote:
On 09/09/2015 08:42, wrote:
Hi. I'm pretty sure that what I want to do is fine, but might someone
with knowledge/experience of such matters please help by confirming?
I want to rig up an outdoor device actuated by PIR sensors. There
will only be one device, but I'd like to have it respond to either of
two sensors, to get broad area coverage. Is it as simple as wiring
both sensor power outputs to the supply terminals of the device?
Clearly, the device will only draw the power that it wants to draw,
regardless of whether one, other, or both PIRs are activated.
However, I'm not 100% sure whether standard outdoor PIRs (e.g. from
Toolstation) might be designed such that the output terminals
becoming live in the absence of PIR sensor activation would be a
problem. This circumstance would occur if only one PIR is activated,
since both outputs would be connected via the supply terminals on the
device.

Cheers. Terry.


You can parallel as many pirs as you like provided they are of the relay
type which most are. The toolstation ones I bought had relays.

The ones with solid state switches will also work if you can wire a
manual override switch to them as they can take mains on the output as
provided by the manual override switch.
Virtually all have relays in now as it removes any issues with triacs
not liking certain types of load.

Triacs are ****ing useless. You can't use LEDs or anything under three CFLs.

--
For men, the conversation happens in addition to driving
whereas for women the driving is something that happens in addition to the conversation.

Hi.
Thanks for all the replies.
Yes, the PIRs will be fed from the same circuit. The plan is to wire a photosensor trigger, whose output goes live in darkness, to a relay, such that I get a "on" switch in daylight only. The two PIRs will both be supplied by the same output of that relay so that they are active in daylight only (which is what I need). Both PIR outputs will be connected to the same power terminals of the single device that I intend to have them control, which, in turn, ought to keep herons away from my pond! Lol.

Cheers. Terry.

On 11/09/2015 15:38, wrote:
Hi. Thanks for all the replies. Yes, the PIRs will be fed from the
same circuit. The plan is to wire a photosensor trigger, whose output
goes live in darkness, to a relay, such that I get a "on" switch in
daylight only. The two PIRs will both be supplied by the same output
of that relay so that they are active in daylight only (which is what
I need). Both PIR outputs will be connected to the same power
terminals of the single device that I intend to have them control,
which, in turn, ought to keep herons away from my pond! Lol.

Cheers. Terry.


The toolstation PIRs have built in photocells.
They only operate in the dark once you set the brightness knob to low.

wrote in message
...
Hi.
I'm pretty sure that what I want to do is fine, but might someone with
knowledge/experience of such matters please help by confirming?
I want to rig up an outdoor device actuated by PIR sensors. There will only
be one device, but I'd like to have it respond to either of two sensors, to
get broad area coverage. Is it as simple as wiring both sensor power outputs
to the supply terminals of the device? Clearly, the device will only draw
the power that it wants to draw, regardless of whether one, other, or both
PIRs are activated. However, I'm not 100% sure whether standard outdoor PIRs
(e.g. from Toolstation) might be designed such that the output terminals
becoming live in the absence of PIR sensor activation would be a problem.
This circumstance would occur if only one PIR is activated, since both
outputs would be connected via the supply terminals on the device.

Cheers. Terry.


Are the PIRs powered by a common source?

ie are they fed from the same circuit

--
Adam

On Wed, 09 Sep 2015 19:34:28 +0100, ARW wrote:

wrote in message
...
Hi.
I'm pretty sure that what I want to do is fine, but might someone with
knowledge/experience of such matters please help by confirming?
I want to rig up an outdoor device actuated by PIR sensors. There will only
be one device, but I'd like to have it respond to either of two sensors, to
get broad area coverage. Is it as simple as wiring both sensor power outputs
to the supply terminals of the device? Clearly, the device will only draw
the power that it wants to draw, regardless of whether one, other, or both
PIRs are activated. However, I'm not 100% sure whether standard outdoor PIRs
(e.g. from Toolstation) might be designed such that the output terminals
becoming live in the absence of PIR sensor activation would be a problem.
This circumstance would occur if only one PIR is activated, since both
outputs would be connected via the supply terminals on the device.

Cheers. Terry.


Are the PIRs powered by a common source?

ie are they fed from the same circuit

No, one is fed from his house, the other from a battery, and the other from the streetlights circuit he hotwired into. WTF?

--
A waiter brings the customer the steak he ordered with his thumb over the meat.
"Are you crazy?" yelled the customer, "with your hand on my steak?"
"What" answers the waiter, "You want it to fall on the floor again?"

"Tough Guy no. 1265" wrote in message
news
On Wed, 09 Sep 2015 19:34:28 +0100, ARW
wrote:

wrote in message
...
Hi.
I'm pretty sure that what I want to do is fine, but might someone with
knowledge/experience of such matters please help by confirming?
I want to rig up an outdoor device actuated by PIR sensors. There will
only
be one device, but I'd like to have it respond to either of two sensors,
to
get broad area coverage. Is it as simple as wiring both sensor power
outputs
to the supply terminals of the device? Clearly, the device will only draw
the power that it wants to draw, regardless of whether one, other, or
both
PIRs are activated. However, I'm not 100% sure whether standard outdoor
PIRs
(e.g. from Toolstation) might be designed such that the output terminals
becoming live in the absence of PIR sensor activation would be a
problem.
This circumstance would occur if only one PIR is activated, since both
outputs would be connected via the supply terminals on the device.

Cheers. Terry.


Are the PIRs powered by a common source?

ie are they fed from the same circuit

No, one is fed from his house, the other from a battery, and the other
from the streetlights circuit he hotwired into. WTF?


That is different "supply" not "circuit".

--
Adam

On Wed, 09 Sep 2015 21:46:55 +0100, ARW wrote:

"Tough Guy no. 1265" wrote in message
news
On Wed, 09 Sep 2015 19:34:28 +0100, ARW
wrote:

wrote in message
...
Hi.
I'm pretty sure that what I want to do is fine, but might someone with
knowledge/experience of such matters please help by confirming?
I want to rig up an outdoor device actuated by PIR sensors. There will
only
be one device, but I'd like to have it respond to either of two sensors,
to
get broad area coverage. Is it as simple as wiring both sensor power
outputs
to the supply terminals of the device? Clearly, the device will only draw
the power that it wants to draw, regardless of whether one, other, or
both
PIRs are activated. However, I'm not 100% sure whether standard outdoor
PIRs
(e.g. from Toolstation) might be designed such that the output terminals
becoming live in the absence of PIR sensor activation would be a
problem.
This circumstance would occur if only one PIR is activated, since both
outputs would be connected via the supply terminals on the device.

Cheers. Terry.

Are the PIRs powered by a common source?

ie are they fed from the same circuit

No, one is fed from his house, the other from a battery, and the other
from the streetlights circuit he hotwired into. WTF?

That is different "supply" not "circuit".

A different circuit wouldn't matter. Same voltage, same phase, etc.

--
Why do MPs drive Volvos?
Because they have safe seats.

"Tough Guy no. 1265" wrote in message
news
On Wed, 09 Sep 2015 21:46:55 +0100, ARW
wrote:

That is different "supply" not "circuit".

A different circuit wouldn't matter. Same voltage, same phase, etc.


But you know exactly why they should not be off different circuits.

--
Adam

On 09/09/2015 21:56, Tough Guy no. 1265 wrote:
On Wed, 09 Sep 2015 21:46:55 +0100, ARW
wrote:

"Tough Guy no. 1265" wrote in message
news
On Wed, 09 Sep 2015 19:34:28 +0100, ARW
wrote:

wrote in message
...
Hi.
I'm pretty sure that what I want to do is fine, but might someone with
knowledge/experience of such matters please help by confirming?
I want to rig up an outdoor device actuated by PIR sensors. There will
only
be one device, but I'd like to have it respond to either of two
sensors,
to
get broad area coverage. Is it as simple as wiring both sensor power
outputs
to the supply terminals of the device? Clearly, the device will only
draw
the power that it wants to draw, regardless of whether one, other, or
both
PIRs are activated. However, I'm not 100% sure whether standard outdoor
PIRs
(e.g. from Toolstation) might be designed such that the output
terminals
becoming live in the absence of PIR sensor activation would be a
problem.
This circumstance would occur if only one PIR is activated, since both
outputs would be connected via the supply terminals on the device.

Cheers. Terry.

Are the PIRs powered by a common source?

ie are they fed from the same circuit

No, one is fed from his house, the other from a battery, and the other
from the streetlights circuit he hotwired into. WTF?

That is different "supply" not "circuit".

A different circuit wouldn't matter. Same voltage, same phase, etc.

A different circuit *would* matter. Think about it.


--
Cheers,

John.

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On 09/09/2015 08:42, wrote:

Hi. I'm pretty sure that what I want to do is fine, but might someone
with knowledge/experience of such matters please help by confirming?
I want to rig up an outdoor device actuated by PIR sensors. There
will only be one device, but I'd like to have it respond to either of
two sensors, to get broad area coverage. Is it as simple as wiring
both sensor power outputs to the supply terminals of the device?

Yup you can do:

http://wiki.diyfaq.org.uk/index.php?...ng_ with_PIRs

With most PIRs and have no problem.

Make sure they are all fed form the same circuit though.


--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/