wha our group did that last term, stupid teamwork. basically they bought a firealarm and lit a fire under it..
hmm what sort of alarm?
my idea is lieka circuit with one of those sound boxed or LEDs attached. anyhows the switch is a metallic pendulum which is inside a metal ring.
and when the base its on moves in any angle too mcuh the 'alarm' sounds.
well hope you understand that