trigger if a continuous wire is cut
Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=117177
Printed Date: May 16, 2024 at 10:52 AM
Topic: trigger if a continuous wire is cut
Posted By: xxcur
Subject: trigger if a continuous wire is cut
Date Posted: October 23, 2009 at 12:43 AM
Sometimes I need to my kayak passes the night on my truck roof on the street, I'm looking the way to trigger my alarm if someone try to steal it. The idea is to put a loop wire which I can pass it through a hole in kayak, so if someone cut that wire activate the door pin and triggers the alarm. I though on making some simple (according wirh my electronics skills), so I though on a relay, that will be activated as soon I connected the loop wire to ground from one side and the other to the relay(86), then a capacitor (charging from + and negative loop wire ) will provide momentary ground to 30 when the 86 looses ground in case of curtting the wire loop and the 87a would be connected to negative Door Trigger. I don't like so much this idea because the relay will be activated all night long and I'm afraid of draining battery, just wainting to deactivate it in case of wire is cut. Any help would be appreciate it.
Replies:
Posted By: howie ll
Date Posted: October 23, 2009 at 1:47 AM
DEI make an adaptor for Ford door switches which will be right, i.e trigger as soon as circuit is broken, also some DEI alarms have a GREEN / WHITE wire for this function.
Posted By: installjunkie01
Date Posted: October 23, 2009 at 7:06 AM
12 volt relay applihttps://www.the12volt.com/relays/page2.asp#sk2cations Try this, You will need 12volts , ground ,& 2 wires for the trigger. Basically, when the relay loses ground, the trigger connects. Let me know how this works for u.If u need specific wiring info, let me know too!
Posted By: Ween
Date Posted: October 23, 2009 at 8:19 AM
hi, connect one end of your wire to ground and the other end to the positive door trigger of the alarm. then add a resistor (4700 ohms) to that wire and the other side to battery power. when the wire is cut, the alarm will see a change on the door trigger input, which should trigger the alarm. the value of resistor given will add less than 3mA drain to the battery. m
Posted By: xxcur
Date Posted: October 23, 2009 at 10:41 AM
installjunkie01 wrote:
12 volt relay applihttps://www.the12volt.com/relays/page2.asp#sk2cations Try this, You will need 12volts , ground ,& 2 wires for the trigger. Basically, when the relay loses ground, the trigger connects. Let me know how this works for u.If u need specific wiring info, let me know too!
That's basically what I want to avoid, the fact that the relay would activated and draining the battery Ween]c wrote:
nnect one end of your wire to ground and the other end to the positive door trigger of the alarm. then add a resistor (4700 ohms) to that wire and the other side to battery power. when the wire is cut, the alarm will see a change on the door trigger input, which should trigger the alarm. the value of resistor given will add less than 3mA drain to the battery.
Ween, that's very interesting and simple, just to clearify, is this the way I should to connect it? the resistor won't be overheat it? 
Posted By: Ween
Date Posted: October 23, 2009 at 2:16 PM
your picture is correct. the resistor will be fine...use 1/4 or 1/2 watt
Posted By: xxcur
Date Posted: October 23, 2009 at 3:29 PM
Thanks a lot Ween,. I will try it. Cheers,
Posted By: 91stt
Date Posted: October 23, 2009 at 4:46 PM
Try to find a DEI 502T, it is a closed loop sensor
Posted By: chadwa2003
Date Posted: October 24, 2009 at 8:34 AM
compustar has a closed loop trigger input on there alarm systems all you have to do is loop it
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