What can I do with piezo buzzers/sirens/beepers, switches, safety switchs, and other basic components?

I have some components I really like, but I don't know how to use them!!!
 (resistors, leds, 555 timers.. etc.)? relays even?

iceng6 years ago
You can get a head-ache.


You can get my favorite a smart tap-tap----tap type binary serial unlock code buried inside of a car door.

joeismydad6 years ago
go search online
Kiteman7 years ago
Browse the Technology section and you should be inspired.
frollard7 years ago
Search 'buzzer' and you'll find a tonne of ibles.