just in case your like me and usually only check out the bit in the preview
pane here is the link again

http://www.ness.com.au/catalogue/public/pages/Ness2003-4_catalogue_page_15.p
df

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Jonathan Johnson
Sent: Tuesday, 9 March 2004 10:52 AM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [EE:] Vibration sensor?


google for nessensor, it is a vibration sensor used in some alarm systems. I
cant remember what principle they work on but they are pretty cheap and
should be easily available wherever you are. If you have any probs getting
them give me a yell, I'm not far from the main sales office in sydney.

Cheers,

JJ

P.S save googling here is a link

http://www.ness.com.au/catalogue/public/pages/Ness2003-4_catalogue_page_15.p
df

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Denny Esterline
Sent: Monday, 8 March 2004 8:45 AM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [EE:] Vibration sensor?


> Can you define "bump" any better ?
>
> What frequency/repetition rate ?
>
> Can the sensor use anything else apart from its own state as
> a reference ?
>

We'll see if my ISP has fixed my delay problem yet (note the original
message took 3 days to get to the list).

I don't have any hard numbers for G force and duration on the bump, but
were talking about a ~2 lbs object being hit hard enough to move it 1/8
inch or so.

As to frequency, one impact will set off a led blink routine lasting 5-10
sec, then the system resets and waits for another. Ignoring any/all impacts
during that time.

It would be best if this could be self contained.

-Denny

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