DIY tripwire alarm

Being that harvest time is getting near its also the time I fear most... Being ripped off. So I set up these little trip wires around my yard to scare off any would be thieves. $1 each at the 'dollar tree'.


Open the package and place the batteries in the alarm.(make sure switch is set to off, Its loud). No need for the magnet.

What you'll want to do next is to first mark a spot on the cover. The mark should be in a spot where two of the batteries meet.

Now make some sort of a hole in the cover where you marked, It needs to be wide enough to place your trigger into.

Put the cover on and make sure you can see the spot where two of the batteries meet.

NOw you'll need to make a trip trigger. I used a plant name marker. Works perfect! But the point is you want to jam something in between the battery connection.

If its in correctly you should now be able to turn the unit on without sounding the alarm.

Unit armed...

Now put a hole in the end of the trigger so you can attach some fishing line to it.

Now place it in a spot that is out of the weather and out of sight.


TIPS:
-Just remember that you want the weakest link in your chain to be the trigger keeping the batteries separated.
-Make sure your trip line isn't going to be tripped by a tree or something moving around due to wind or growth.
-It will withstand wet weather conditions but if you'd like you can hide it better.

Peace, I hope this helps someone...

cool

These work good too. Vibration sets them off. I put wooden stakes in the ground with the alarm attached to it and then run 50lb test fishing line 18 inches off the ground to each stake. I can hear them through my baby monitor and the theives would theoretically run while im racing to the door. The wind can set them off so try to block it out near alarm

@NeWcS Awesome man. That is a very sweet idea.

That's some Macgyver shit right there! Right on!

This paintball mine is based (i.e. ripped-off) from a patent I found online. (US # 6,688,234 B2) Browsing patents online is a great way to come up with cool ideas for your own projects! The mine is a small canister that you bury in the ground, filled with liquid paint. A standard 12 gram CO2 cartridge is inserted upside down into the canister. A top with a plunger centered over the cartridge is screwed on. When someone steps on the plunger the cartridge is pierced, pressurizing the canister and expelling the paint. I feel the original patent has a simple, but serious design flaw. Look at Diagram #1 below. When the CO2 is released it follows the path of least resistance, and blasts directly out of the holes, carrying some, but not all, of the paint with it. It also tends to create more of a thin “aerosol spray” with the paint. Diagram #2 shows my design, which adds tubes/nozzles in the holes with a small gap beneath them. When the CO2 is released, it cannot travel down to the tubes, so instead it pressurizes the canister, forcing almost all of the paint out before it can escape out through the tubes. This results in more of the paint being expelled in a thicker and more forceful stream.
Symmetrical_paint_ball_land_mine.pdf(592x853) 266 KB
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http://www.instructables.com/id/Build-a-Paintball-Mine/


Try something like above but with a pepper compound , or with slight mod rock salt

TTT just for the hell of it. Still people waiting to harvest, somewhere I'm sure...

I like the simpler things ......

Driveway alarm is easy but if your not home your idea is better.

Personal security alarms are ideal for this, and basically what you made, just have to secure it and tie fishing line to the pull chain.


I can't vouch for this brand, I just snagged an example picture off Amazon. But a buddy of mine uses some like this that are so freaking loud I could feel my eardrums pulsating lol