I am working on a project using one of Analog Devices micromachined
accelerometers, and have found it very easy to use.  Its output can be
connected directly to a PIC analog input, so you could easily make a circuit
with programmable acceleration detection.

The +-2G parts are only a few dollars as they are made in large quantities
for airbag sensors.

> -----Original Message-----
> From: Jeff DeMaagd [mailto:jeff@DEMAAGD.COM]
> Sent: Friday, August 03, 2001 2:29 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [EE]: Accelerometer brakelight (was Modulating a
> headlight)
>
>
> ----- Original Message -----
> From: Short, Evan <eshort@FERRARI.IT>
> Subject: [EE]: Accelerometer brakelight (was Modulating a headlight)
>
>
> > Ironically, I had already modified my bike to make me more
> visible from
> > behind - I built a brakelight which activates a row of high
> intensity
> LEDs -
> > more LEDs for heavier deceleration. I've always thought
> that this was
> > important on a motorbike, as you can be decelerating quite
> heavily from
> > engine braking alone before you touch the brakes. Using an
> accelerometer,
> > the drivers behind get a warning before your main brake
> light comes on. I
> > used a PIC, naturally, a 12C series reading the digital output of an
> Analog
> > Devices surface mount accelerometer and controlling the lights.
> > I'd be interested in knowing if anyone else has done a
> similar project.
>
> An old classmate of mine built such a similar product, but
> rather than show
> you the acceleration it flashed.  He didn't say what was involved in
> designing it.  I haven't heard from him since last December though.
>
> Jeff
>
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