How to Create a Trip-wire Alarm with a Few Simple Items

One man created a trip-wire alarm out of just a few items found in his junk drawer, and when triggered it can set stuff on fire!
Interesting Engineering

The internet is full of useful and fun DIY projects that you can do with just a few items from around your house. Having a trip-wire alarm would be great for when you are out camping or maybe just those times you need a warning if someone is coming your way. Regardless of what you plan on using it for, all you will need to create this little battery operated trip-wire alarm is an AA battery, some metal push pins, some wires and a string. The video below will take you into more detail of how to set everything up.

This trip-wire alarm works by completing a circuit when the string is pulled away. In the video, once the circuit is completed it sets fire to a flammable substance. If you don't have anything like that laying around, you could just wire up an LED, or maybe even hook up a buzzer circuit. If you really want to scare that intruder away, hook up the fuze to a bunch of firecrackers and they will go running.


The youtube behind this project does a lot of DIY videos about mini tools like this, and it is surprising how much you can make with just a little bit of ingenuity. He makes a tiny Dremel from an old motor along with tons of other stuff. Given a day and a drawer full of junk, you could probably make everything and have yourself a bunch of nifty little tools.

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