the ADXL acceleromiters from AD are really nice
in terms of interface straight into the A/D converter
0-5v range, simple SW noise filter would suffice

use a smaller PIC with their digital PWM style output perhaps
PIC10F + acceleromiter (keep in mind you get to quote bulk prices in your
"final product")
+ siren (or use the horn and indicator lights) and link into the cars
existing door open warning system.
LM705 + decoupling caps internal RC osc
few logic level FET's
perhaps some gidgets?


> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu]On Behalf
> Of Jinx
> Sent: Friday, May 27, 2005 22:26
> To: Microcontroller discussion list - Public.
> Subject: Re: [EE]:Trembler/tilt switch was Maxim truck hijacked
>
>
> > Two axis accelerometer IC (ADXL202 and friends.)
> > $US15/1 Digikey.
>
> I've considered accelerometers. Given more time to develop
> the product and maybe a higher sale price (not likely) or lower
> component cost, they'd be worth looking at
>
> Aza's suggested something piezo
>
> Two bits of wire is attractive financially but there could be
> mechanical difficulties
>
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