This is so common on the web, why would you want to pay for it?
Unless it was homework.

http://www.cs.umd.edu/users/musliner/sonar/notes

http://www.epemag.wimborne.co.uk/projects1998.html
November 1998 PIC Ultrasonic Tape Measure

and a few dozen other hits.

And you haven't given any details on the tranducers.
You DO realize that you'll need to do some analog
design as well.

Robert



Sara XXXX wrote:

> hi, i was wondering if anyoone can write me a code for an ultrasonic 
> tape measure. pic16f84  has to creat a 40khz signal and then has to 
> count how long iit will take for the sigal to come back, and must from 
> there calculate its distance and send the data to LCD.
> 
> I will pay for anyhelp provided
> 
> 
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