Infrared Intruder Alert

Stop intruders from trespassing on your property with this infrared alarm system.

Step 1 What You Need

1. Garage Door Sensors like these
2. Wireless Doorbell Chime for $6
3. Photocell
4. Various components as shown in the schematic.
5. 5 Volt AC Adapter. You need a regulated supply so the voltage does not 'float'. A 1.0 Amp supply will typically be regulated.

Comments

[eneergcam]

now you know when the crazy man down the street has gone crazy and is planning to kill you with an axe!

[tech123456789]

I thought it is spelled ax not axe. Axe is a brand of hair products

[eneergcam]

 good observation! but no, its spelled axe.

[black hole]

It's spelled both ways.

[XWXAXDXEX]

isnt this a time consuming door chime, chimes already do that.....

[musick_08]

what if he goes around it though?

[matt_and_nick]

you would have to know it's there. or you could just jump over it

[eneergcam]

Yeaaahhh, i didnt think about that....know i only have one arm :(

[musick_08]

oh no! you better duct tape it back on! lol

maybe you could surround your house by building a few of these

[blueninja33]

(removed by author or community request)

[bowmaster]

M-16 with armor piercing ammo.

[cave man smash!!]

add a modified drill in the place of the door bell and use it to pull a string that pulls the trigger on a blanked off M-16.(detterant instead of excessive force security law suit

[tech123456789]

What about using a cannon

[bowmaster]

No, a nuke on a 10 second timer.

[bowmaster]

And then shoots a 10 round burst after 5 seconds.

[Thundertydus]

Why AP? And why an M-16? You just need a long shelled silenced .17, Leave the neighbours wondering

[J Moneyman]

exactly!

[bowmaster]

Or 1 gross tonne of C-4.

[XWXAXDXEX]

This is in the suburbs, most likely not to do but while in the woods thats a different story >:()

[Thundertydus]

30 gigaton payloaded warheads

[bowmaster]

Lolz, that's the same power I use to open cans.

[Thundertydus]

dont say lolz

[bowmaster]

*Lolz*

[james.mcglashan]

lolz hehe im board

[bowmaster]

Hire Chuck Norris to round house kick them.

[grimgroper]

 zero creativity here... you guys need to watch more SAW

[tomtortoise]

I suggest you have a pit in the ground filled with punji sticks and tigers

[bowmaster]

And ninjas.

[tomtortoise]

but ninjas don't need a pit for people to fall into they. work alone

[bowmaster]

True, but they'd want to keep the Tigers happy by petting their heads.

[eneergcam]

Now were thinking

[bowmaster]

Vulcan minigun.

[imkwl12345]

wtf you dont have to have a massive gun to kill someone... did it ever occur to you, you could just use a knife?

[bowmaster]

Exacto blade catapult.

[imkwl12345]

KNIFE!

[nobelium106]

check out the Ghurka Khukri knife. One of those in a good size would make the holder feel pretty safe

[bowmaster]

I *love* those.

[bowmaster]

Exacto knife blade catapult.

[Thundertydus]

Rechambered Vulcan minigun firing exacto blades

[Thundertydus]

And catapaults...