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Find A Lever Or Switch In The Dark


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#1 Mmm786

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Posted 09 December 2019 - 06:43 PM

Hi I am stuck writing a novel. The protagonist is stuck outside a building being chased by the bad guys. He already tried to get into the building during the day but there was no way in. There are no doors windows or anything. My idea was he sees a lever or switch using a uv torch he is carrying but is this scientifically possible? Can anyone think of a better solution? The important thing is they are able to get in because it's night if that makes sense. Any help would be much appreciated. Max

#2 GAHD

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Posted 09 December 2019 - 07:35 PM

lots of things do glow under UV light. So, sure, why not.

https://geology.com/...scent-minerals/

WHY the lever would glow needs some contrivance; weather it's because it was used by someone covered in some fluorescent dust before and they left a hand-print, or contains some of the right impurities in the concrete or stucco or whatever.



#3 Mmm786

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Posted 10 December 2019 - 02:13 AM

Great thanks for the response. What other things glow under UV lights?

#4 GAHD

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Posted 10 December 2019 - 02:54 AM

That's a good question!



#5 Mmm786

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Posted 10 December 2019 - 08:38 AM

The fluroscent mineral idea sounds good. One of the bricks could be made out of such mineral. Although it looks the same as the other bricks to the naked eye it's a different colour under a UV torch? Is that plausible?

#6 sanctus

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Posted 11 December 2019 - 04:26 AM

What about instead of UV torch, a heat sensor (infrared?) and the switch having a current and hight resistance is actually warmer?



#7 Flummoxed

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Posted 11 December 2019 - 04:54 AM

Why not have the door open automatically at night time due to movement or heat. Your protagonist ie I assume is a mammal and therefore hot, a sensor could detect him/her/it when close enough, and the door would open automatically. If the bad guys/things/whatevers are reptiles the door would not open. Alternatively just have a movement sensor near to the door, that is only activated at night time. Or why not have your protagonist have an electronic pass card to hand, or chip inserted in the skin, to activate a coded gate. OR the gate could be sound activated, sing a song or something in the right key, which might not work if your protagonist is tone deaf, a tuning fork might help the tone deaf, or not. 



#8 Mmm786

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Posted 11 December 2019 - 03:28 PM

The building is in the middle of a desert so I think heat sensor is probably out the question. So I'm thinking the UV torch shows up a slight difference in one of the bricks and they find it's a hidden control panel to gain entry. How's that sound?

#9 sanctus

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Posted 12 December 2019 - 03:15 AM

Why? Deserts are freaking cold at night, so heat sensor would work like a charm



#10 Mmm786

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Posted 12 December 2019 - 05:43 AM

What is an infra red heat sensor? I want it so it can't be detected by the naked eye. Does make sense though its colder in the night so could work if it's plausible the protagonist would carry a heat sensor. What u guys think?