Whether you are camping or home alone, this low-tech perimeter alarm is guaranteed to startle intruders and alert you as soon as something goes awry.
How to Make a Perimeter Alarm for Your Home
Let’s be honest with ourselves. How many times have we woken up in the middle of the night “hearing things?” It could be a raccoon, the neighbor’s cat or just a simple rush of the wind. Even the refrigerator makes scary noises.
Well, we have a quick fix. This super simple warning system takes no time at all to set up, and it uses mostly items you already have around the house.
You can check out the full video tutorial here:
Below are the step by step instructions for building this nifty little security device. If you’re more of visual learner and you’d rather watch the instructional video we put together, please scroll to the bottom of the page. Otherwise, let’s dig in!
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What you’ll need to make your perimeter alarm:
- Air horn
- Duct tape
- Flat rock
- Cardboard Tube
- Tripwire (i.e. fishing line)
How to make your perimeter alarm:
Step 1: Create your perimeter alarm post.
Give your post a good wrap with tripwire (we used 6lb fishing line). Be sure to leave plenty of tripwire on the trailing end to ensure that you can reach your tie off point.
Tying off your post is one of the most important parts of your perimeter alarm. If your post isn’t securely wrapped it may never trigger the horn!
Step 2: Create the guide for your alarm.
Insert your air horn perimeter alarm into the cardboard tube and cut it to size.
This step ensures that you don’t have to dig a new hole every time your perimeter alarm needs to be replaced.
Step 3: Place your perimeter alarm.
Dig a small pit for your perimeter alarm in an out of the way location (make sure you have natural brush and debris that will cover the area and keep it from standing out to an intruder).
You’ll want to bury the alarm about halfway from the top and tightly pack the earth around it so that it doesn’t shift.
Step 4: Create your trigger.
Remove the air horn from the cardboard tube and attach a strip of duct tape to the side of the can. Roll a second piece of tape into a “button” about the size of a grape and place it on the air horns trigger.
Place the first strip of tape over the button and secure it to the other side of the can. Smooth it out to ensure the duct tape is securely attached to the can.
Step 5: Set your post and deadfall.
Insert your post a maximum of 1/3 of its length into the ground in front of your alarm pit. (any more than this and the post may not pull free when the tripwire is activated.
Carefully balance your deadfall (stone) on top of the post.
Add natural brush and debris around the deadfall to create a natural look that won’t stand out.
Step 6: Tie off your tripwire.
Tie off the loose end of your tripwire to a tree or other stationary object. Be sure to elevate the tripwire at least 3-5 inches off the ground (low enough to remain unnoticed, but high enough that it will still trigger).
You’ve now secured your home, campsite or bug out location!
This quick, simple, and easy to set up perimeter alarm will give you that last second heads up you need to prepare yourself when an intruder enters your campsite or bug out location.
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Check out more trip wires and booby traps here: