[Vanhackspace] Arduino - Using sensors and analog inputs - Tuesday April 28, 2009. 7:00pm

[dan anderson]

I suspect that the humidity of small air pockets in soil would be hard
to get precise measurements from, and humidity of a solid isn't
practical. Humidity of air above the surface would be too prone to
atmospheric changes that aren't actually linked closely to how wet the
underlying earth is. Maybe take a tube of soil (akin to a core
sample), and attach a newton-meter? You could determine weights (or
more practically densities, since then you could change tube sizes)
for different soil conditions, though soil composition would matter a
lot and you'd need new samples if you redug large sections of garden,
or if you wanted to duplicate it in a different locale with different
base soil conditions, etc.

One advantage of that is that you could measure across whatever depth
of topsoil you care about. A big disadvantage would be that it'd be
prone to error from plants growing on it, animals stepping on it, etc.
Though it could be a funny burglar alarm, too.

-D

2009/4/27 Luke Closs <lukecloss at gmail.com>:
> I want some sensors to help me know when to water my garden.  Any ideas?
>
> Wetness sensors?
>
> Cheers,
> Luke
>
> On Mon, Apr 27, 2009 at 5:18 PM, Ryan Smith <bigryeguy at gmail.com> wrote:
>>
>> Hey everybody. VHS is running another Arduino night, Tuesday April 28,
>> 2009 at 7 pm at the Hackery.
>> This month we are looking at using sensors and analog inputs with the
>> Arduino. As with all of our events we are looking for people who want
>> to learn as well as people who want to share and teach. If you have an
>> Arduino, or even some cool sensor or input device you've used or would
>> like to try and use with the Arduino, then this is the place for you.
>>
>> For directions to the hackery please see
>> http://vancouver.hackspace.ca/doku.php?id=map
>>
>> Ryan
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