Ever wanted to make your own DIY alarm security system? Believe it or not, you can make your own wireless DIY home security for only $10 with a few simple hacks to a prepaid cell phone. You can easily catch intruders who set off the tripwire because this neat little gadget calls your cell phone right when it happens.

Well, I’m going to show you how to make a cellular alarm system, and all it’s going to take are a few common tools, a couple of hours, and a $10 Tracfone from Target.

DIY Alarm  Security System: How to Make Your Own At Home

Home-made Alarm System

Follow these simple steps and you will soon have an awesome little gadget that alerts you to any unwanted intruders.

DIY Alarm System alerts you on your cell phone when a paper or string trigger activates it. You will immediately get a call on your phone alerting you that your tripwire has been activated.

Supplies and Tools You Will Need

Supplies and Tools You Will Need | $10 DIY Alarm System That Calls Your Cellphone | Home Security Systems | cellular alarm system

How to Make a DIY Alarm System

Step 1: Activate the Phone

Begin by following the instructions in the manual to activate the phone. We went online to activate ours, but if you don’t have an internet connection there’s a number you can call as well. All of this information can be found in the phone’s box.

Step 2: Program the Phone’s Speed Dial Function

 Select cell number 8 then select your name from the contacts list.

Next, we need to program the phone’s speed dial function to call your phone number when the number 8 key is held down.

First, enter your phone number into the phone by going to Menu >> Contacts >> Add New Contact

Once you’ve added yourself to the phone’s contact list, pair your number with the phone’s number 8 key by going to Menu >> Contacts >> Speed Dial List

Step 3: Disassemble the Phone

Remove the screws from the back plate and disassemble the phone. There are five screws in total.

Disassemble the Phone | $10 DIY Alarm System That Calls Your Cellphone | Home Security Systems | alarm system

Use a small Phillips head screwdriver to remove the screws.

Step 4: Separate the Phone Into Three Pieces

Once the screws are out, you can use your box cutter to pry the back plate from the front plate. It takes a bit of force and will make a loud snapping sound as it separates, so don’t worry about breaking it because you won’t. Once you’ve created some space with the box cutter, you can use your fingers to do the rest of the work.
When you’ve pried it apart, it will be in three pieces.

Step 5: Work With the Middle Piece

Locate the button corresponding to the number 8 on the keypad by cross-referencing it with the rubber keypad on the front plate. Each foil circle is a button and you’ll notice that the layouts match up.

The number 8 button on our phone is the second one from the bottom of the middle row. Once you’ve found it, cut the metal foil from it with a box cutter.

Work With the Middle Piece | $10 DIY Alarm System That Calls Your Cellphone | Home Security Systems | best self monitored home security system

This will expose a copper ring with a copper circle in the middle of it. We need to solder a wire to each of them without crossing them.
Important Note: You need to know the soldering basics.
If you screw the next step up, the phone will be ruined and you’ll have to buy another.
Don’t worry. It’s not that hard but you’ll probably want to practice on a circuit board before proceeding.

Tip: You can buy circuit boards like this from Radio Shack for $5. They also sell wire, solder, and soldering irons.
$10 DIY Alarm System That Calls Your Cellphone | Home Security Systems | ring alarm system
Once you can solder wires this close without having the solder touch, you’re ready to move on to the real deal.

Step 6: Solder the Wire

With a soldering iron, place a small amount of solder on the tip of a wire. Don’t go overboard.

Solder the Wire | $10 DIY Alarm System That Calls Your Cellphone | Home Security Systems | best diy home security system

Now, solder the wire to the copper circle in the middle of the copper ring. The solder cannot touch the gold ring around it or the button will be ruined. This is why you practiced first. 😉

Step 7: Solder the Outer Ring

Repeat the same steps with another wire, this time soldering it to the outer ring. Again, make sure the ring stays separated from the circle.

Step 8: Test Your Soldering

Test your soldering by touching the two wires together.

Test Your Soldering | $10 DIY Alarm System That Calls Your Cellphone | Home Security Systems | diy home security camera

The phone should work normally as if you were pressing the number 8 key on the keypad. If you screwed it up, nothing will happen.

Step 9: Cut Number 8

Use the box cutter to cut the number 8 from the keypad.

Step 10: Thread Through the Keypad

Thread the two wires through the keypad and then reassemble the phone. Once the phone is assembled, drip glue from a hot glue gun into the hole to keep the wires secure.

Step 11: Prepare the Aluminum Foil, Clothespin, and Hot Glue

Now, take a strip of aluminum foil and fold it over the end of one of the wires.
Using your fingers, bend the end of the wire back to its original form.
Wrap the aluminum foil around the wire to secure the fitting.
Use a clothespin to clamp the end of the wire.
Fold the aluminum foil over the top of the clothespin and secure it into place with the hot glue gun.
Secure the wire onto the body of the clothespin with hot glue.

Step 12: Repeat Step 11 to the Other Wire

Repeat these steps with the other wire and fasten it to the other half of the clothespin.

Step 13: Braid the Wires

Braid the two wires together by twirling the clothespin.

Step 14: Attach the Clothespin

Attach the Clothespin | $10 DIY Alarm System That Calls Your Cellphone | Home Security Systems | ring protect security system
Fasten the clothespin to the back of the phone with hot glue. And your tripwire is complete!

How to Set Up and Activate Your Tripwire

1. The clothespin holds the number 8 key down on the phone and so you need to separate the two halves with a thin piece of paper. Receipts work great for this.
2. When the paper is removed, the contacts on the clothespin touch and the phone will speed dial your number.

3. You’re probably going to need to exit out of the door that you’re booby-trapping—I mean trip wiring—and so you’ll need to set it up like this:
4. Tape your tripwire device to the wall and drape the string over the doorknob.

5. Run the string under the door and make sure to give yourself enough slack to get outside.
6. Slowly close the door while pulling the string under the door toward you. Don’t pull it tight, but remove all the slack until you feel it tugging against the doorknob on the other side.
7. Just before you shut the door, tape the string to the threshold.

8. Now, cut it and shut the door.

9. You won’t be able to see it because you’ll be outside, but this is what your beautiful craftsmanship will look like from the inside.

Watch this video by Mr. Llega for an amazing homemade burglar alarm tutorial:

You’re suspicious that someone is entering your shed when you aren’t there. Your birdseed definitely isn’t where you put it. Tools are missing. You never forget to latch your toolbox, yet there it is, unlatched. If only there was a way to know for sure that someone has been groping your tools behind your back. If only you had a trip wire device that called your cell phone as it was happening. This way you could catch the villain in the act and make him repay you all the birdseed he practically stole right out of your gentle hands. This DIY alarm system will help you do just that!
What do you think about this affordable DIY alarm system? Share your thoughts in the comments section below!
Up Next: DIY Remote Controlled Home Security Camera

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Editor’s Note: This post was originally published on April 18, 2014, and has been updated for quality and relevancy.

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