trigger if a continuous wire is cut

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.

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

That's basically what I want to avoid, the fact that the relay would activated and draining 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?

Thanks a lot Ween,. I will try it.

Cheers,