Making an alarm for my door

[Pew446]

Well, I have a router that lays in my room, and when my brother gets mad cause the internet is slow, he'll come in and start swearing at me for doing whatever I didn't do. And usually this happens at night; he wakes me up.

I want to make an alarm so when he comes in my room to steal my laptop or.... whatever, I want a buzzer to sound. But I can't quite figure out how to make it sound when the door is opened... :/ Help would be nice.

 

[Resqueline]

Oh dear..
Sounds like you need a high-voltage zapper on the doorknob instead of a buzzer that will just wake you up anyway.

But you'll find many recipes if you just Google with these keywords: homemade door alarm buzzer.

 

[neon]

bad idea zapper some people are kill by heart attack go to harborfreight.com for $20 buy a silent chime your location alarm simple yes?