Outdoor sensor detecting people and not doors

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Old 12-05-11, 09:57 AM
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Outdoor sensor detecting people and not doors

Hi

I have an outdoor garage door that I consider to be a bit dangerous, specially for kids. It is iron built and it slides sideways.

I was thinking of installing an outdoor sensor that should trigger only when a person is close to the door, but obviously not when the door is moving.

Does anyone know if anything of this kind is commercially available?

Thanks for your help
 
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Old 12-05-11, 10:07 AM
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There are several things that may work. A infra red motion switch will detect anyone or a decent sized animal in the area. A photo eye across the opening is required with all garage door openers in the USA. You can also put a bumper switch on the leading edge of the door.
 
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Old 12-06-11, 01:37 AM
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Thanks for your answer
I also thought that PIR sensor would probably do the job, though i will probably have to install more an one to cover the dark spot caused by a pillar half way of the path of the door (i undrestand PIR needs direct vision to be triggered)
I have seen there are are some sensors used for alarms that combine both PIR and microwave. Would these be better for my purpose?
I believe the bumper switch would only cover the edge of the door, and i would like to cover it all, as the door is not solid, and a kid could put the hand through
Below is a drawing of the door mechanism
--| |--|
--| _________________________|--|.................................
(pillar). Door when closed. (pillar). Door when open

Door opens --->
door closes <-----
 
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Old 12-06-11, 04:46 AM
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Yes, the bumper switch only works if someone touches the switch.

I do not think a dual technology (IR, microwave) sensor would be good unless you have trouble with false alarms. Both sensors the IR and microwave must see the target before is says it sees something.
 
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Old 12-07-11, 01:10 AM
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I have order a PIR with some brain to avoid too many false alarms, as there are some trees nearby, and with reduced detection angle to try to limit the operation just to the area around the gate.
http://www.securitywarehouse.co.uk/c...ge-p-2477.html
Thanks for your help
 
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