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Way Of Detecting Humans? Answered

Is there ~~an easy way~~ a best way of detecting humans in the dark, or in a forest? Me and my friends play airsoft, usually in a forest, and it's hard to know where the enemy (other friends) are. I'm a sniper and I want an easy way to detect them. One way would be a thermo-camera, but those are expensive. Is there a better way?

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mlinguist
mlinguist

8 years ago

Yeah. Wild planet makes a toy night vision camera for $40. It's actually a viable night vision camera that sees near-visible infrared light. You would be able to see them, but they wouldn't be able to see you. I'm planning on taking mine apart and working them into either some kind of helmet or a pair of goggles. They also have a switch to go between visible light and infrared. You could use them in any scenarios involving dark buildings, or caves, or anything similar. The only issue is that you can only see as far as your IRLEDs shine, but they make some super bright you could get at radio shack that would peobably allow you to see pretty far.

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Peter.Steele
Peter.Steele

10 years ago

I want to say this came from one of the Evil Genius series of books, but I can't remember for sure.  There was a way to make a very basic thermal viewer that wouldn't break the bank, but it was extremely low refresh rate - something like 10 frames per MINUTE.

Looked workable, though, and pretty easy to build.

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tic tac man
tic tac man

11 years ago

you could scatter some ir led's (hooked up to power suplies) on the ground, use an ir camera and if something blocks the light from an led SHOOT! 

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KaydenST
KaydenST

11 years ago

Maybe something similar to RADAR or SONAR...

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Kaiouss
Kaiouss

11 years ago

"One way would be a thermo-camera, but those are expensive." Why don't you make a new post and see if anyone has ideas for a cheap thermal camera (preferably compact, in your case)? It's highly unlikely that an individual can make it for cheaper than a manufacturer, but there are plenty of 'ibles where that is not the case. Always worth a shot.

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guyfrom7up
guyfrom7up

Reply 11 years ago

most people just make IR cameras, not thermal. Thermal ones are reallllly expensive because the main component is difficult to manufactuerer flawlessly, plus there's not a huge demand for them

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Kaiouss
Kaiouss

Reply 11 years ago

Also, just an idea, but what if you had a camera with a coupled audio output what would emit a whine that is beyond the human range of hearing, but that could be detected by the "camera" and used to construct the night scene. A high pitch wouldn't be good for long distances, but might be better for detail (as in echolocation). I've seen prototype software on the newscientist youtube channel, so it would definitely require a lot of software engineering skillz, but there are lots of people who like a challenge.

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Punkguyta
Punkguyta

Reply 11 years ago

 Because camera sensors cannot see "noise" ??

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Kaiouss
Kaiouss

Reply 11 years ago

Yes. Audio input. Many cameras have it.

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Punkguyta
Punkguyta

Reply 11 years ago

 Lol... but that would only record onto the recording medium (tape/disk/memory stick) the audio that's inputed. The camera still would not be able to differentiate where different sounds were coming from.

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Kaiouss
Kaiouss

Reply 11 years ago

Not by default, but there are ways to do it. You would need more than one microphone on the camera and then based on the frequency of each wavelength (and this is only wavelengths around the frequency emitted by the camera which are out of range of the human ear) you would have something determining distance. This is possible and they already have equipment that does it, just not for this sort of thing.

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Kaiouss
Kaiouss

Reply 11 years ago

I have no doubt about that, just wasn't sure if someone else who might be an electrical engineer would have any ideas. As for the IR cameras, the ones I've seen on Instructables don't really do what I would consider an IR camera would be capable of doing. I would envision a good piece of IR equipment for this situation being compact, picking up and magnifying IR input like a lot of CCTV security cameras do, and other things like that. A lot of the IR cams I've seen don't really take the kind of IR input you would need. Maybe worth bringing up amongst the community.

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guyfrom7up
guyfrom7up

Reply 11 years ago

it sounds like a challenge indeed, but for echolocation to work wouldn't it take a bunch of microphones to "display" the image in reasonable resolution? I dunno, I'd have to read up on it. But it also sounds like a great deal of data for a common 8 bit microcontroller to handle. Maybe it's time to learn up on 32 bit...

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Kaiouss
Kaiouss

Reply 11 years ago

Indeed, you are correct, such an endeavor would be prohibitively expensive. Sad.

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Kiteman
Kiteman

11 years ago

Plant a noise-maker (say, a recording of somebody tripping up and going "ow") on a timer, position yourself a few yards away, possibly up a tree.

When the timer goes off, shoot at anything that shoots at the noise-maker.

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crapflinger
crapflinger

11 years ago

spread nails, thumbtacks, etc.. everywhere in the woods. shoot at anything that screams in pain

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airsoft1017
airsoft1017

11 years ago

try listing for noises with a noise detecting device works for me or just listen very carfully good luck

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Sandisk1duo
Sandisk1duo

11 years ago

i have an idea! get some IR leds form dealextreme, then attach them to an appropriate power supply, then hide the working leds on your friends' clothes. if you get a camera phone, (or any other device that has a camera and a screen) cameras can detect IR light which the human eye cannot detect so in essence, you can see them in the night

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guyfrom7up
guyfrom7up

Reply 11 years ago

i was thinking of doing that, but i think my friends would figure it out pretty fast, and so it'd only work for like 1 round and then never again :P

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Sandisk1duo
Sandisk1duo

Reply 11 years ago

get an led and a button cell that would be about the size of a quarter

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kelseymh
kelseymh

11 years ago

I think it's called a "dog." They have four legs, are covered with hair, and generally emit slobber from their mouths.

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guyfrom7up
guyfrom7up

Reply 11 years ago

yep, I'm going to take my dog where my friends are shooting, good plan

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kelseymh
kelseymh

Reply 11 years ago

You asked if there was an "easy way." You didn't ask for the "best way," or the "safest way," or anything else. I think you got an answer that was worth exactly what you paid for it :-)

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guyfrom7up
guyfrom7up

Reply 11 years ago

lol, now i must make a change xD

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Rock Soldier
Rock Soldier

11 years ago

One way would be a walkie talkie where you think they might go by, then you have a general idea. Of course the hidden walkie talkie would be to be taped down so you can hear it.

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guyfrom7up
guyfrom7up

Reply 11 years ago

yeah, at that point why don't i put tracking beacons on them :P

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Rock Soldier
Rock Soldier

Reply 11 years ago

Because a beep beep beep every second kinda ruins their purpose of being unseen.