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Author Topic: how to control water capacitance?  (Read 1902 times)

Offline theorygame

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how to control water capacitance?
« on: March 25, 2008, 12:05:53 AM »
kasi sa water level detector project ko, hindi na magamit na conductor yung tubig dahil daw sa water capacitance.
paano po ba controlin yun?

nakakabit sa flip flop yung probes ko.
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how to control water capacitance?
« on: March 25, 2008, 12:05:53 AM »

Offline rdpzycho

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Re: how to control water capacitance?
« Reply #1 on: March 25, 2008, 01:17:39 AM »
DC ba pinapadaan mo?

use pulsating signals...
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Re: how to control water capacitance?
« Reply #1 on: March 25, 2008, 01:17:39 AM »

Offline theorygame

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Re: how to control water capacitance?
« Reply #2 on: March 25, 2008, 02:33:59 AM »
12 v dc supply.

kng minsan nga ramdam ko parang nakukuryente bibig ko. o baka feeling ko lng yun?
;))

~

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Re: how to control water capacitance?
« Reply #2 on: March 25, 2008, 02:33:59 AM »

Offline rdpzycho

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Re: how to control water capacitance?
« Reply #3 on: March 25, 2008, 09:52:23 AM »
gawin mo munang pulses yung 12V dc...at DC caps are open...

pwedeng 555 timer...

mahirap ata baguhin capacitance ng tubig kung hindi gagamit ng ibang substance na ihahalo sa tubig...
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‎"Divide each difficulty into as many parts as is feasible and necessary to resolve it."
- Rene Descartes

"For every difficult problem there is always a simple answer and most of them are wrong."
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Re: how to control water capacitance?
« Reply #3 on: March 25, 2008, 09:52:23 AM »

Offline Ganda692002

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Re: how to control water capacitance?
« Reply #4 on: March 25, 2008, 10:09:30 AM »
mas presice yata ang gumamit ng pressure gauge sensor as level dector.. o kaya pressure switch nalang..
sa freescale meron MPxxxx maliit na sensor lang sya.. pede kabit sa PCB tapos lagyan mo ng tapping hose papunta dun sa dedetect mo water depth.. may nakita ko nun noon sa alexan MPX10DP kayalang 1.45psi range diffrential sensor lang(pang venturi tuble lang yata to).. ang liit nun you need at least 16psi for 1 meter water depth range..

pag pressure based less affected yung accuracy nya by chemical\electrical characteristics ng water.. like salinity etc..
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Re: how to control water capacitance?
« Reply #4 on: March 25, 2008, 10:09:30 AM »

Offline rdpzycho

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Re: how to control water capacitance?
« Reply #5 on: March 25, 2008, 10:45:33 AM »
teka, ano ba yung exact paggagamitan ng project?  ;D
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Offline spidamang

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Re: how to control water capacitance?
« Reply #6 on: March 25, 2008, 10:52:00 AM »
water tank niya yata. kasama ko iyang si theorygame sa trabaho. :D
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Offline rdpzycho

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Re: how to control water capacitance?
« Reply #7 on: March 25, 2008, 11:21:27 AM »
eto isang circuit kung water level detection using multiple rods (yung common sa water tank)...

http://www.uoguelph.ca/~antoon/circ/sensor3.htm
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Offline theorygame

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Re: how to control water capacitance?
« Reply #8 on: March 25, 2008, 10:48:52 PM »
Quote from: rdpzycho on March 25, 2008, 11:21:27 AM
eto isang circuit kung water level detection using multiple rods (yung common sa water tank)...

http://www.uoguelph.ca/~antoon/circ/sensor3.htm

thanks to this. ito rin ang design ng isang group sa namin noon (ibang section sya).

pero pwede kaya gamitan ko nalng ng semi-permeable tubing ma may asin sa loob para maelimite yung water resistance?
(o kaya pvc pipe nlng na may butas sa ilalim)

design for elevated water tanks. para hindi na kelangan on/off ka sa water pump at bantayan na mapuno yung tanke.
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Offline rdpzycho

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Re: how to control water capacitance?
« Reply #9 on: March 26, 2008, 12:35:13 AM »
may gumagawa ng probes para dito...dati may nakikita ako sa bodega dito...ginagamit ata ng tatay ko sa ibang client niya...

merong isang itim na plastic (hexagon ata shape nun na kasing laki ng pwet ng bote ng 1.5 na coke) na merong 3 female thread...tapos merong 3 metal rod na magkakaiba ng haba...

yung pinakamahaba dun nag-originate yung signal...yung nasa malapit dun, indicator ng wala ng tubig...yung nasa taas indicator ng puno na...
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Offline ahlburuto

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Re: how to control water capacitance?
« Reply #10 on: March 30, 2008, 08:50:47 PM »
Quote from: theorygame on March 25, 2008, 10:48:52 PM
thanks to this. ito rin ang design ng isang group sa namin noon (ibang section sya).

pero pwede kaya gamitan ko nalng ng semi-permeable tubing ma may asin sa loob para maelimite yung water resistance?
(o kaya pvc pipe nlng na may butas sa ilalim)

design for elevated water tanks. para hindi na kelangan on/off ka sa water pump at bantayan na mapuno yung tanke.

hindi ba pwede yung floatless switch ang gamitin mo? tutal eh para lang naman mapuno yung tangke di ba? para di rin on and off yung motor. dun ka na lang mag adjust sa setting nung rod. pwede mong gawin eh 25% ng water level ang cut-in tapos 95% ang cut-off.
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Re: how to control water capacitance?
« Reply #11 on: March 30, 2008, 09:34:51 PM »
Di ba dapat dada-an muna sa op-amps as "amplifier" yong rod, para makalibret ang "gain" with relation to the values of resistance ng tubig at ang distance ng dalawang rod. (Note: U must have two rods at upper level ng tank at two rods sa lower level ng tank) tapos dada-an nanaman sa op-amps as comparator yong signal para maging malinis na "pulse" saka pa e input sa logic ckts.....one LM324 i think will do the job....
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Re: how to control water capacitance?
« Reply #11 on: March 30, 2008, 09:34:51 PM »
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