Small motion sensor triggered by projectile impact to play sound

[Dagata]

Hi,

I need some help trying to identify something, I personally don't know the term for it, but someone here should

basically I'm looking for a motion sensor device, that all it has to do is have it be set off, and it would trigger a sound effect(computer chip or some sort, help me out sorry) it would be a projectile object that would set it off(about the size of a nickel) so this sensor is really small something you could put in your pocket.

Thats about as best I can describe what I'm looking for, hopefully someone here will be able to catch on to what I'm trying to look for

~~Thanks

 

[ray b]

light beam? mirror set up, break the beam to the mirror sound a buzzer
fancy motion detectors use lasers but no need to get that hi-teck

or a micro wave [radar ] like auto door openers use in stores

garage doors have the light beam set up to prevent a kid geting hit
or motion sensors from a crime light [maybe the cheapest]

 

[Dagata]

yeah its basically the same idea as a garage door opener, except it would be really small, like it would fit in a water bottle, I just don't know what that would be called, or where to get them

 

[stewartcs]

Google "small motion sensor" and see what comes up.

 

[ghost02]

what would yuou be doing with this anyway.

 

[Dagata]

its just an idea that's being tossed around. But I need something that can be really cheap, it doesn't have to neccessarily a motion sensor, because the only ones I can find are over $50, the thing I need would fit in a water bottle, and would trigger when water went past it(to make a sound effect)

 

[out of whack]

Say what you want to do, half-hints are just confusing. If you want to make a sound when water enters or leaves a bottle, electrodes around the neck might do. If you want to do something else, say what it is. It's hard to help without knowing what the problem is.