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'[OT] Low Power PIC instrumentation part 2'
1) thanks for all the help
2) Duh, When I said 1 amp relay, I meant 1 amp solendoid.
The solendoid is indeed energized momentarily.
3) The sensor is looking through beer (1/2 inch tube) and when it sees foam,
it triggers. Thus visible light emitter and sensor seemed best.
I am open to suggestions.
Y2K The biggest block party on the planet
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Gus Calabrese Lola Montes WFT Electronics
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|Gus Calabrese wrote:
> 1) thanks for all the help
> 2) Duh, When I said 1 amp relay, I meant 1 amp solendoid.
> The solendoid is indeed energized momentarily.
> 3) The sensor is looking through beer (1/2 inch tube) and when it sees foam,
> it triggers. Thus visible light emitter and sensor seemed best.
> I am open to suggestions.
It doesn't need to be visible light, anything will do it.
You can use physical electrical contact with the foam, using
two metalic pins crossing the tube, but it will make ionized
metal in contact with the beer, not that it will make it drunk,
but can change the beer taste anyhow.
The LED pulsing very breafly from time to time also works with
low power consume. But... the 1Amp solenoid power will come
from the little 3V battery???? If yes, forget about the LED
consume... and start to worry about the solenoid.
But, if you are trying to get the beer foam out of the tube
opening a valve or something like that when the sensor sees it,
there are some mechanical ways to do that, since foam floats
and can enter in some vent traps.
Enough for an out of topic, and as far as I know we can't
discuss alcoholic beverages in here, mainly how to produce it. :))
Wagner Lipnharski - UST Research Inc. - Orlando, Florida
Forum and microcontroller web site: http:/http://www.ustr.net
Microcontrollers Survey: http://www.ustr.net/tellme.htm
'[OT] Low Power PIC instrumentation part 2'
|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
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.)
Gus Calabrese wrote:
One other thought; Something like this could, I've thought, be
powered off a solar cell in the "Solar Racer" tradition - Has anyone
tried that? I'm pretty curious, just too busy to get to that idea yet.
I'd think that having a secondary cap after a diode (those in series,
paralleled with the main "dump" cap), running the LED off the PIC,
charging the capacitor up to max and every now & then the PIC wakes up,
and if the solenoid needs to fire, use the large "outermost" capacitor
to supply it's current (the diode would block all back EMF etc.)?
For Solar Racers, see:
oscillator that drives a motor when it's charged a Cap fully.)
Also BEAM robots:
http://www.solarbotics.com/ (there's a lotta goodies through their
Also, http://www.robotmag.com/links/links.html is interesting IMHO <G>
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