moving sensor

[gatoulisss]

hello guys,
what is the best sensor to monitor a movement? for example if something moves then a buzzer sounds if it stops then silent.
i was thinking a tilt sensor like SW-520D but under specific situations then it doesnt work.
is an accelerometer sensor good for this work?

thanks a lot!

[Paul Moir]

Geeze, they're so cheap maybe?

How about a car alarm shock sensor?

[gatoulisss]

so what would make the job? an vibration sensor or a sensor like Sw520 was doing fine but after i realize that in some angles arent working thats why im searching for something more accurate