I'd love to be the first to take you up on that, but I'm probably not
(I'm offline just now <G>)
I'd think that a pressure sensor should be able to detect a change in
pressure head (4 feet of foam has very little pressure, if you change
from detecting -foam-, to detecting low pressure in the tube, it might
be an equivalent way to handle this - I assume this is beer decanting or
something.
Also, could some other light source be used? (They make these solar
patio lamps, make something similar with a solar-powered LED with
battery backup, you could run this entire circuit off that & have power
left for the solenoid or Solid State Relay, I'd think?) Or use a
"skylight" during the day, or fiber optic in the light from some 'always
on' light source? Also, a solar cell might work for a light sensor.
(Not saying these are better solutions than an identical LED and/or
phototransistor - those're GOOD answers! But trying to show the "Think
devious" mentality, "how can I get what I want for free", basically.)
Nice Lead-Acid deep cycle batteries are available at Costco etc. (Golf
Cart batteries), should run this circuit for about a year or so, charge
monthly? <G> Yeah, I know, those's a brute force solution, but if
you're making enough beer for everyone on THIS list, you must be making
a REALLY LARGE beermakery <VBG>
(Don't know, with beer, if you want light streaming through it, OTOH;
My dad's good at brewing, I know we've always stored it pretty much in
the dark in the past.)
Mark
Gus Calabrese wrote:
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