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Solenoids.
At 03:48 AM 12/13/98 -0500, Dennis noted:
> So far my only problem was when I tried to use a solenoid to shut it off
at night
>the one I used only reduced my flow and leaked. So I'm now running it
>24/7 until I solve the solenoid problem.
Right on, Dennis. This is a major problem with solenoids. There are two
solutions (as usual):
1. Spend the $$$. I am guessing a bullet-proof, never-fail,
works-perfectly-forever solenoid with a similar power supply is about $100.
Of course, that neglects the cost of the timer, pH sensor, or whatever.
And bullet-proof pH sensors do not exist in my experience.
2. Expect failure and build a failure-tolerant system. This is the idea
of the current project that 8 members of this list are helping me with. I
hope to come out with a $12 solenoid (includes power supply) soon. You
will need to add your own timer. I will not approach pH control, it isn't
worth it for plants.
--
Dave Gomberg, San Francisco mailto:gomberg at wcf_com
http://www.wcf.com/wcf
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