Human Detector
I'm trying to come up with a small, cheap, simple circuit that will detect a human. I plan to use a grid of luxeon rebel OLEDs and whatever detector I come up with embedded in my ceiling to light up only when you are under them. I've looked into passive infrared, but it's fairly expensive for the components I could find.
Any leads for circuits, ideas, or parts? I'd use parts from cheap security lights, but they tend to be around $10 each and I would probably need around12-18 ... kinda painful on the pocketbook.
Thanks in advance for any help!
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Kinda replying to all in one post here ... No pets or autonomous robots :) I've been thinking of ir beams for our outdoor sidewalks, but indoors I think that I would have to have a really tight grid or someone might get missed. Also, people may sit down or move tall furniture in the way. I've been thinking of some sort of IR, though. Why would I want to avoid PIR if I can find cheap enough components? $0.99 would probably fit the budget. I saw the goldmine-elec parts, too, but was wrried that I couldn't find a spec sheet for it. I'm very open to other ideas, though. I've been toying with the idea of antenna detectors like a theremin, but It seems you have to be pretty close to the wire for any detection.
Jan 30, 2008. 7:21 AMgmoon
says:
At .99, you could probably reverse engineer the detector (based on other PIR schematics), even if you bricked a couple.
One point--you could reduce the number of sensors by widen the detection area of each one. Detection response could be based on whether you're triggering 1,2, 3 or 4 sensors simultaneously.
More of an interconnected mesh, than individual autonomous sensors. More logic complexity and wiring, but probably cheaper...
One point--you could reduce the number of sensors by widen the detection area of each one. Detection response could be based on whether you're triggering 1,2, 3 or 4 sensors simultaneously.
More of an interconnected mesh, than individual autonomous sensors. More logic complexity and wiring, but probably cheaper...
That's a good point regarding a mesh-type grid. I wanted to do analog only, but a pic would probably be easier. I used to be quite a competent programmer in a past life, but my circuit-designing skills are pretty weak.
I have a basic stamp I dev board That I can usually get to do what I want. I could probably use 4 detectors to control maybe 9 lights.
like this, perhaps?
I have a basic stamp I dev board That I can usually get to do what I want. I could probably use 4 detectors to control maybe 9 lights.
like this, perhaps?
- = light
- * *
- * *
- * *
grr ... one more try
o = light
x = detector
o = light
x = detector
o o o x xo o o x xo o o
Jan 30, 2008. 10:39 AMgmoon
says:
Yeah. I'd tend to use a micro. But I bet you could do it with discrete gate logic, too. The devil would be in the details ;-). Sure would make an interesting exercise in logic, though...
I really like the discrete logic idea. I plan to use this i'ble to drive the OLEDs, so I think it would mostly be a matter of testing out the PIR detector for voltage/resistance/whatever, designing the logic, and then figuring out all of the values needed and sourcing the parts.
My big hangup is figuring all the component values. I lost my electronics book in a move (I'm moving again in a month and hope to find it again). But even with the book, I tend to guess values. I can usually fudge something together for a small/cheap circuit, but not something complex like this. Any links to sources to better educate myself?
My big hangup is figuring all the component values. I lost my electronics book in a move (I'm moving again in a month and hope to find it again). But even with the book, I tend to guess values. I can usually fudge something together for a small/cheap circuit, but not something complex like this. Any links to sources to better educate myself?
dangit! try this:
{{{x = detector}}}{{{* * *}}}{{{ x x}}}{{{* * *}}}{{{ x x}}}{{{* * *}}}
Jan 30, 2008. 7:24 AMthejrb
says:
You would probably want something that would beep or flash or something when it senses heat at the body temp. No clue how you would do it but a start.
Jan 30, 2008. 6:06 AMgmoon
says:
You don't want PIR, but I've seen the detectors and boards sold very cheaply, if you look around-- here's an example...
You probably already saw the PIR detectors for robotics 'ible posted here just days ago....
You probably already saw the PIR detectors for robotics 'ible posted here just days ago....
Jan 30, 2008. 3:47 AMschorhr
says:
A couple of IR-Beams across the hallway in shoulder-height might do it. If a beam is blocked, someone must be present. Dont use the sensors as coathangers though.
Jan 30, 2008. 1:25 AMPatrik
says:
Do you have any pets - or a roomba? If not, that simplifies things significantly!
To make the detection you have to detect what is unique about a human (as opposed to say, a bear, dog, deer, automobile, etc). There is size (but then we have bear and a few simians) warmth to separate out the non-living....what will be the method of determination / seperation?
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