G'day,
Can you get a copy of the Circuit Cellar Ink Magazine #85 August 1997?
On page 76 Jeff Bachiochi has a project using ultrasonics for his robot.
It uses a PicStic and he has all the code in the article.

Cliff Rogers   (Computer Technician)  email  cliffrogers@usa.net
http://www.geocities.com/SiliconValley/Peaks/9176/
Absolute Computers Pty. Ltd. Cairns, Queensland, Australia.

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> From: Octavio Nogueira <nogueira@MANDIC.COM.BR>
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Distance measurement
> Date: Wednesday, 22 October 1997 23:09
>
> Hi to All,
>
> I'm trying to do a ultrasound distance measurement with PIC, I don't want
> to use the Polaroid module. Does anyone has some experience to share?
> I know how to generate the transmition pulse but I need help in the
> receiver part.
> The range will be from 20 to 200 inches.
>
> Best regards,
>
> Octavio
> ======================================================
> Octavio Nogueira  - e-mail:   nogueira@mandic.com.br
> http://www.geocities.com/~oct_nogueira
> "ProPic" Production PIC Programmer Windows under US$20
> ======================================================