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Posted to uk.d-i-y
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Two PIR sensors to actuate one device
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.
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