Home Security and Alarm Center

I made a hidden redstone circuit that not only opens metal double doors (which could be put at the entrance of a decoy vault) at the press of a button, but sets off an alarm seconds later. To trigger the alarm, the button powers a diagonal booster track, sending a minecart onto a detector track, which then powers the block, but is inverted, so the power to the note blocks is turned off, switching the power source to a rapid repulser, which will play the notes, sounding the alarm. This could be used to catch intruders in your house, and if your house is built properly, possibly out of obsidian, you could trap the intruder inside, so you could come see who it is, unlike most other traps, which usually kill the intruder.