One place to find it is

http://www.hobbyrobot.com/sensors/index.html

On Mon, 15 Nov 1999 14:34:56 +0000, Peter Keller wrote:

>A couple of weeks ago I read about an electronic compass module on this
>list.
>The module has 4 or 8 hallelements and gives a direction of 1 of 8 per
>360 degrees.
>Does anybody has a link to this page ?
>Has anybody experience with this module ?
>Peter Keller
>