Re: metal fence alarm project
- From: John Fields <jfields@xxxxxxxxxxxxxxxxxxxxx>
- Date: Sat, 20 Oct 2007 10:42:14 -0500
On Mon, 15 Oct 2007 13:00:43 -0000, lerameur <lerameur@xxxxxxxxx>
wrote:
Hi,
I would like to install an alarm system on a metal fence (it is made
of 15 metal wires horizontal spaced about 5inches with vertical wires
attached every 5 inches. So it makes a grid) It is approximately 1
mile in length. I thought of measuring the resistance with a micro
controller and when some one cuts the fence at one place it will
increase the resistance and sound a horn. But after some test even if
I cut 1 or 14 wires, the resistance do not change. Anybody has an idea
on how to install an alarm system so when some cuts the wire the alarm
will go off?
I cannot electrify the fence by the way.
---
If the intent is to detect whether someone or something goes past
the fence, why not use a laser to build a beam-break detector?
--
JF
.
- References:
- metal fence alarm project
- From: lerameur
- metal fence alarm project
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