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[DPRG] Accelerometer Questions

Subject: [DPRG] Accelerometer Questions
From: Dan Miner miner at centtech.com
Date: Wed Nov 20 18:41:00 CST 2002

Pressure is the right way to go.  At the rates you're
accelerating under water, the noise from the sensor will
be bigger than the real signal.  

Get a pressure sensor.

				- Dan Miner

> -----Original Message-----
> From: Frank & Gail Elia [mailto:elia_frank at hotmail.com]
> Sent: Wednesday, November 20, 2002 6:11 PM
> To: dprglist at dprg.org
> Subject: [DPRG] Accelerometer Questions
> Has anyone worked with the ADXL105 or similar from Analog Devices?
> I need to find a way to tell if I am moving underwater.This 
> past weekend I 
> found myself diving in Lake Travis. At the bottom of the Lake 
> it was so dark 
> even powerful lights didn't help. The problem was having no 
> reference, I 
> could not tell if I was ascending/descending without 
> constantly monitoring 
> my dive computer. What I want is a simple device that will 
> tell my if I'm 
> going up or down via a simple audio tone.
> You could monitor changes in pressure, but it seems an 
> accelerometer would 
> do the job more simply, but I'm open to suggestions.
> Frank
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