hello. I would like to install a very simple alarm system. I've been reading a little about the professional models online and they have to many features and most have very poor documentation for a beginner.
I was thinking of something simple like magnetic contacts on all exterior doors wired to a piezo buzzer by my headboard.
I'm assuming I would use normally open contacts wired in parralell then wired in series with a piezo buzzer? Do I need resistors or anything else?
I realise the alarm would cease if the wires were cut or the door was shut but it would be enough to wake me up and hopefully startle the thief.
My other question is can those radio shack surface mount contacts be used on a steel door with foam core without using some kind of stand off? I've heard you can and cant so I dont know what I should do.
I appreciate any other ideas. im just learning about electronics so I want to keep it simple.