Cheap?  Can you give a source for a cheap ultrasonic unit?  Most of the
ones I've seen are relatively expensive.

Thanks,

G



At 08:19 PM 4/11/2002 +0200, you wrote:
>Hi, Tim
>How about u ultrasonic distace measure unit ?
>It should be easy to detect say 2" to the lid or infinity when open.
>Parts are cheap. Mchip have an appnote abt it I think.
>
>
>----- Original Message -----
> > > From: Tim McDonough [mailto:tim@MCDONOUGH.NET]
> > > this time period. Cost of the sensor/switch is an issue.
> > > My first thought was a mercury type switch like those found in wall
> > > thermostats. Any idea who makes these?
> > > I'm open to other suggestions as well.
> > >
> > > Tim
>
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