Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!bloom-beacon!mit-eddie!uw-beaver!uw-june!uw-entropy!quick!amc!pilchuck!ssc!markz
From: markz@ssc.UUCP (Mark Zenier)
Newsgroups: sci.electronics
Subject: Re: Light Duration Meter
Message-ID: <1896@ssc.UUCP>
Date: 10 Apr 89 02:42:55 GMT
References: <102@raider.MFEE.TN.US>
Organization: SSC, Inc., Seattle, WA
Lines: 22

In article <102@raider.MFEE.TN.US>, root@raider.MFEE.TN.US (Bob Reineri) writes:
> I've recently planted our first garden, and being the computer nut that I am,
> love to keep records. The rainfall and temperature are easy enough to get. The
> other item I would like to track is the amount of sunlight the garden gets on
> a daily basis. I am entering all this into a database so I'll have something
> to ponder over the next winter.
> 
> Does anyone have any ideas on what might be a suitable circuit for this applic-
> ation ? 

One neat thing was published in Whole Earth Review/ COevolution Quarterly.

A big Fresnel lens and a board.  The focused sunlight burned the board
showing the sunlight or lack of it.  A new board every day.

If that's not high tech enough, you could get a TV camera and a frame
grabber to read off the days board.


Mark Zenier    uunet!nwnexus!pilchuck!ssc!markz    markz@ssc.uucp
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