Home Skills & Knowledge Prepper Skills Improvised Perimeter Alarms

Improvised Perimeter Alarms

What if it’s dark, or you’re asleep and someone is creeping up to your house? This won’t happen if you have some improvised perimeter alarms

Improvised Perimeter Alarms

In the woods, you can rig up some fishing line to your cooking gear or cans and fashion a trip wire alarm. For home security this doesn’t translate well, who really wants fishing line running around their yard and pots and pans in their yard?

A simple solution for this can be using driveway alarms as improvised perimeter alarms or an electronic tripwire!

If you aren’t familiar with driveway alarms, they consist of a tiny box that causes a remote chime to sound when something breaks it’s beam.


Benefits to these driveway alarms:

  • Inexpensive
  • Works up to 200 feet away
  • Wireless installation
  • Weather resistant
  • Receiver chimes when sensor is crossed

One caveat to remember, if you want to cover multiple approaches, verify you can change channels on the sensors and the alerts they trigger. If not then try to get units from different vendors. Otherwise you’ll end up with a single sound for all your regions, triggering all chimes (same frequencies) and will leave you unsure if the alert originated from the front of your property, the sides or or to the rear of your property. This can be mitigated if the units have multiple frequencies and multiple alert chimes.driveway alarm-1

In direct sunlight these can be unpredictable. Also make sure to put them high enough that dogs, cats or woodland creatures don’t set them off and avoid aiming these units towards vegetation that can be moved by wind.

For an economic Improvised perimeter alarm (electronic tripwire), find yourself some driveway alarms, but make sure to read the reviews from other buyers to ensure that they will provide the quality you need and serve your purposes!


  1. check out Dakota alerts. basically a murs radio that tells you there is movement. i also read about a diy solar powered motion sensor. the guy took a cheep motion sensor and wired in a red led in place of the buzzer. wired in two solar cells from a solar yard light. he put them around with the led pointed at the house( he also used a black painted straw as a light shield ) my thinking is that the Dakota alerts would alert you to a general area and the leds would pinpoint the threat.

  2. We have the Bunker Hill unit featured on this page. The only drawback is it burns through batteries quickly, especially in cold weather.

    • Batteries: They do have a power adapter port, and you can also use rechargeables. My biggest concern with them is long-term durability. How is it?

  3. I prefer 12 gauge trip alarms over electrical, if it’s an animal it’ll scare it away, if it isn’t he’s going to think twice on if that was a warning shot or not. Prices range from $20-30 and last forever if you have the ability to reload your own rounds.

    Example(s): https://www.hitechammotogo.com/html/perimeter_alarm_systems___acce.html

    And yes, there are .308 (compatible with 30.06 and .45 APC) versions around: https://www.spokaneairsoft.com/archives/viewtopic.php?t=4983&sid=fa1ae1374afeb8a5dc2c86c141deb56e

    How best to use these? Depends on where you are and what’s more valuable. Ideal to set up a dummy target away from you where you can move to higher ground/call for support while they track down where the shot came from.


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