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I thought this may be of interest to sowacs members.. it was posted on
Trickle-l (apologies for any cross-posting)
Bruce
At 22:36 3/05/98 +0100, you wrote:
>Am attempting to hook up a Theta probe (delta) to a tiny talk logger. This
>I have done OK. I would like to be able to use the logger's alarm facility
>to operate a relay for controlling a standard 2" 24v hardi valve. Am not an
>electronics expert so could anyone offer guidance or is there a kit around
>that already exists to do this job. Id like the relay to cut out the valve
>( i.e. override the controller's decoder) at a preset moisture content to
>prevent overwatering.
>
>The alarm signal on the logger is a small logic signal sufficient to switch
>on a tiny led this signal may possibly need amplification/ battery
>suppliment
>
>Regards
>
>David Wyant (Vegetable Grower Kent UK)
>
Fullpoint Probe Services in the UK work with the Theta probe on a
commercial basis and I'm sure they'll be able to help. Try Duncan Spencer:
Fullpoint Probe Services
168 Butley Road
Eyke
Suffolk IP12 2YR
Phone: (01473) 717810
Fax: (01473) 717863
Car: (0589) 189610
Regards
Michael Dawes
Tobacco Res. Board
Harare, Zimbabwe
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--
Bruce Metelerkamp
owner sowacs list and website: soil water content sensor discussion
sowacs@pobox.com http://www.sowacs.com/
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