Metal proximity detection
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Posts: 46,084
Hello all,
I'm trying to find out what sort of sensor I would need to use to
detect the proximity of a large metallic object (say, umm, a car...)
I am trying to design a new driveway monitor. The current one uses
a motion sensor which picks up everything from my dog to UPS trucks,
and everything in between...
I would love to make it metallic-sensitive so I could eliminate the
dogs, cats, deer, groundhogs, etc from setting it off.
Somewhere through my purposeless searches on the internet in years
past, I seem to remember there being a metallic object sensor... Some
sort of proximity sensor... that has a field of detection that is
fairly large(several feet)... Does such a device exist?
In the end, I would like to totally build a monitor system based on
a stamp to take care of this problem for me...
Thanks!
I'm trying to find out what sort of sensor I would need to use to
detect the proximity of a large metallic object (say, umm, a car...)
I am trying to design a new driveway monitor. The current one uses
a motion sensor which picks up everything from my dog to UPS trucks,
and everything in between...
I would love to make it metallic-sensitive so I could eliminate the
dogs, cats, deer, groundhogs, etc from setting it off.
Somewhere through my purposeless searches on the internet in years
past, I seem to remember there being a metallic object sensor... Some
sort of proximity sensor... that has a field of detection that is
fairly large(several feet)... Does such a device exist?
In the end, I would like to totally build a monitor system based on
a stamp to take care of this problem for me...
Thanks!
Comments
brad@g... writes:
> I am trying to design a new driveway monitor. The current one uses
> a motion sensor which picks up everything from my dog to UPS trucks,
> and everything in between...
>
> I would love to make it metallic-sensitive so I could eliminate the
> dogs, cats, deer, groundhogs, etc from setting it off.
>
Could you put a metal detector in the center of your drive way?
Sid
[noparse][[/noparse]Non-text portions of this message have been removed]
I just found a link that is sort of interesting:
http://www.smarthome.com/7170.html
It shows a sensor that appears to be contained in PVC piping... Not
sure exactly whats within the pipe, but I suspect its some sort of
large ferrite rod with a coil on it... My guess is that the control
unit senses the changes in inductance when a vehicle drives over it...
Unfortunantly, I'm not much for figuring out analog-ish circuits.
Digital is what I know. lol.
Anyway, I'm going to keep digging. Thanks!
> Could you put a metal detector in the center of your drive way?
>
> Sid