Aren't you annoyed when people come in your room without permission. In this instructable you will learn how to stop people from entering in your room. The steps will tell you how can do it in different ways.

Step 1 and 2- How to detect the people that are trying to get into your room.
Step 3, 4 and 5-How to stop people from entering your room.
Step 6 and 7- Help for step 5

Step 1: Tripwire alarm

The first way to detect the people is a simple tripwire alarm. It is very cheap, requires very few items and is very easy to make. The things that you will need to make the tripwire alarm are

9v battery and clip
Piezo or any siren or any kind of buzzer
A plastic peg/clip
Some thick thread and a piece of plastic

This is someone else's idea and is also available as another instructable

Its just a simple circuit and instead of the switch we'll use the clip. On both the points of the clip we'll use some duct tape or foil paper to attach the wire. Now if we leave the clip it will conduct if if we press it from the other side it will stop the circuit. We will simply take a peice of plastic or any other non conductive thing and tie a thick thread to it. Now tie the other end to some where on the other side and put the plastic peice in the clip to stop the circuit. When the person comes, the thick thread will get pulled and the plastic will get removed and thus, the piezo siren will start up.The schematic and a photo of the alarm made is given in this step.
Step 3 is dangerous & illegal. You could kill someone !! Even a weak shock can cause death in someone with a heart condition. For that reason it is against the law to set "booby traps". Step 7 simple can't work. Your eyes cannot detect IR light & adding a blue & red filter in front on them simply means you now can't see blue & red, just green ... It's also illegal to use copyright material like the first picture without permission. Better do more research before you write... You have good ideas, just need to think them thru.
Actually I mis-stated about the filters , red filter passes only red, blocking blue & green , Blue filter passes blue & blocks red & green , so you'll have nothing...
Step 3 says it will shock them a little, not like a stun gun.
The point is you never know if someone has a heart condition or pace maker so even a little shock can be fatal. Why take the chance of killing someone over something so silly !
Stop having a spazm at someone for having a fantastic idea yeah maybe a little dangerous but no need to go crazy LECTRIC WIZARD <br> <br>Fantastic work jumper1111
Spasm ? go crazy ? Since when is it crazy to try to teach someone safe practices &amp; respect for electricity &amp; other people ?????
thanks harry park
No problem just defending what is correct

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