On 05/04/2013 12:25 PM, Steve Smith wrote:
> Time signature for sure its the most accurate clock that's free..
> Steve
>
> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf =
Of
> John Gardner
> Sent: 04 May 2013 15:47
> To: Microcontroller discussion list - Public.
> Subject: Re: [OT] Greenhouse misting
>
> Also, presumably big plants need more water than little plants.
>
> Bound to be a way to work GPS into this...   :)
Worked at a greenhouse years ago that had a device that looked fly=20
swatter sticking out of a box. It was balanced and had a mercury switch=20
on the part in the box. The outside part was a fine mesh screen.
When the screen was dry the switch was closed and the mister was on. The=20
weight of the water tipped the rod and the switch opened.

As the water on the screen dried the rod would rise and turn on the mister.
store
We used in our cutting beds and never lost a plant due to insufficient=20
moisture. We purchased it at a greenhouse supply store.

--=20
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