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/****************************************************************************
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 Title  :   SRF08 RANGING MODULE FUNCTIONS library 
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 Author:    Chris Efstathiou hendrix@otenet.gr
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 Date:      13/Jul/2002
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 Software:  AVR-GCC with AVR-AS
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 Target:    any AVR device
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 Info:      This code is FREE. There are no copyright issues with this code.
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*****************************************************************************/
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I use it to drive the SRF08 ultrasonic ranging module
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for use with Free Fall night parachute landing 
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where i MUST know the distance from ground in order to land safely.
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Infrared goggles gives you an idea about the drop zone
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but you cannot judje the precise distance from the ground due to
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optics distortion.
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For programming example see the SRF08 module code.
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CAUTION: THIS IS A TEST PROGRAM. DO NOT USE IT FOR PARACHUTE LANDING!!!
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         There are too many thing missing from the code like
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         audio and visual alerts, height averaging, variable gain, 
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         variable range settings and many other safety features
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         needed to make it suitable for this task!
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         I can experiment because it is my life! 
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         Its only purpose is to give an idea of how to use the driver code.
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I hope it can help someone.
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Chris.