Looking for a 'tripwire' flashlight

Dave_H

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Nov 3, 2009
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589
Location
Ottawa Ont. Canada
In case anyone's interested I found a clearout at Ikea, a metal strip designed to mount inside large filing cabinet, so that two LEDs which come on when the door opens. Product is called OMLOPP (love those Swedish (?) names). https://www.ikea.com/ca/en/p/omlopp-led-light-strip-for-drawers-aluminium-colour-70435730/ It has two small SMT white LEDs, operates from 12-24v dc, PSU not supplied. It uses an IR LED+detector (not PIR) which senses door proximity; seems to work well. Put small opaque object or some tape loosely over detector and connect to the "trip" cord. Either that, or position so it comes on when a door opens. Form factor is long/thin and could be attached to wall, door or ceiling. Light consumes 130mA at 14v (1.8W) dropping to 60mA at 12v (0.7W). Downside is standby current ~4mA which is not bad for a larger 12v battery (7-9Ah gel cell), could be a problem for smaller ones. If the OP doesn't find this useful, someone else might. Dave
 
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Ken_McE

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Jun 16, 2003
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1,684
Turbodog, I know that you don't want to run line voltage through the wall of the shelter, that you see it as a safety hazard. What would you think about running 12 volts DC in through the wall? You could have a smart battery tender plugged into the garage somewhere and have a good sized 12 volt battery that lives inside the shelter and is always available to run things.
 

turbodog

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Jun 23, 2003
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5,335
Location
Southern USA
Turbodog, I know that you don't want to run line voltage through the wall of the shelter, that you see it as a safety hazard. What would you think about running 12 volts DC in through the wall? You could have a smart battery tender plugged into the garage somewhere and have a good sized 12 volt battery that lives inside the shelter and is always available to run things.

Would rather not have live a/c anywhere near the steel structure. I'm in good shape currently. The 'tripwire' light is in place along with 2 small spare lights, 2 small 'd' cell powered fans, some water, and spare batts for the fans.

We have a LOT of large tall trees around the house. They could come down and push live wires into areas that I would rather them NOT be in.
 

turbodog

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Jun 23, 2003
Messages
5,335
Location
Southern USA
After the new forum changes, it's much easier to post pictures.

Not my best work... but it's solid.

123 cell in a holder, reinforced with good old electrical tape.
12 gauge copper wire with 4 leds
microswitch
trip device tied to string that goes across doorway
held to steel wall with a couple of rare earth magnets

unit is in the far corner where you won't brush up against it


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