8051 and sonar (depth finder)

jentzd_at_gmail.com
Date: 12/29/04 

Date: 28 Dec 2004 16:10:03 -0800

Hi all,

Recently I am stuck on my first microcontroller project. I think I have
everything nailed down to the absolute last detail, but have not yet
been able to find a solution to this - after about 6 weeks of looking.

My 8051 microcontroller is trying to determine the ocean floor depth.
To do this, it sends out a ping, enables a timer, and counts how long
until the echo is returned. Simple enough - right?

My problem is not in the sending of the ping - or in counting the echo
return (I use timer0 and expect no overflows), it is simply in getting
back a consistant echo. Echos that I do recieve range in time from 500
ticks to 60000. When I turn off my labview echo simulator - I still get
the wildly varying and inconsistent results! Help!

I can provide schematics if necessery. For now I will keep it simple by
saying I detect echo signals generated from the comparator1 interrupt.
An active low indicates a echo.
Any help would be greatly greatly appreciated.
-David

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