On 8/10/07, Steve Lancaster <[EMAIL PROTECTED]> wrote:
>
> If you place two parallel wires in the trough surrounding the screw,
> parallel
> to the flight of the screw, such that you have a constant "volume" of
> chips over the sensor wires, then measure the conductivity you will have
> a rough idea of moisture content... (This will work better if the screw
> has a pitch better than 45 degrees, such that the area you pick will
> always
> be under wood and not the screw.)
>
> If you can electrically isolate two sections of screw, driven from
> opposite
> ends, you might also be able to measure the conductivity of the sample
> "between screws"..
>
> Or.. if you can meter a constant volume of material onto a "moving scale"
> you might be able to tell by weight... within a given species of
> wood.
Well, you could try that method. One of the "battery" chips (DS2438, DS246X
DS247X, DS278X) can measure voltage, current and temperature. Wouldn't that
work?
All are supported by OWFS.
Paul Alfille
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