Parallax sells quite a nice one with a three-wire interface:

http://www.parallax.com/detail.asp?product_id=28015

Hobby Engineering sells some excellent ones too, including the
Devantech SRF08 with 6m range and reporting of multiple echoes from
each ping. It has an I2C interface.

http://www.hobbyengineering.com/SectionS.html

Cheers,
Zik

On 02/06/06, Brent Brown <brent.brown@clear.net.nz> wrote:
> Hi,
>
> I remember seeing a link on the PIClist recently (last 2~3 months) to an intersting
> looking ultrasonic distance sensor module - but now I can't find it again! (spent ages
> searching my PIClist emails, browser history, google, etc). Probably mentioned in
> passing to some loosely related subject... from what I remember it was an approx 1"
> square PCB module with Ultrasonic transducer mounted on it. Range was 6" to
> 200" or similar and had analog output (maybe even SPI interface?), price on the
> web site was US$29.95. I can't remember exactly what was so appealing about this
> one to me, probably the combination of size/cost and ease of use.
>
> Hope someone's memory/filing system is better than mine. Thanks!
> --
> Brent Brown, Electronic Design Solutions
> 16 English Street, Hamilton 2001, New Zealand
> Ph: +64 7 849 0069
> Fax: +64 7 849 0071
> Cell/txt: 027 433 4069
> eMail:  brent.brown@clear.net.nz
>
>
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