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Author Topic: water level meter  (Read 2414 times)
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veli
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« on: April 16, 2009, 06:33:20 18:33 »

pls help me to build water level meter.the one i made uses 4 probes for empty,quarter,half and full.Now a want a better design.
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oldvan
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« Reply #1 on: April 16, 2009, 11:30:38 23:30 »

Can we have more insight into the dimensions of the water vessel to be measured?

Do you want to go with a simple expansion to 8 probes, or would a float and potentiometer be appropriate?

Perhaps ultrasonic rangefinder to detect depth to water?

Probe that changes capacitence as the water level increases?

At the extreme,  a lovely woman with a tape measure.  Pleasant to look at and voice output.

Many ways to approach this, but we need to know more details of the application first.
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HeliEye
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« Reply #2 on: April 17, 2009, 09:32:05 09:32 »

I recently designed a simple water level detector for air conditioner water drip trays in computer rooms. 
It uses stainless steel contacts, a simple mosfet detector driving another mosfet and relay combo.  I feed 12V to one of the contacts, via a 10K resistor, the other contact, when water is present, turns on the mosfet, fires the relay, giving an alarm. I see no reason why the same circuit couldn't be applied to multiple level/trigger points.

Steve
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lillbear
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« Reply #3 on: April 20, 2009, 08:00:19 08:00 »

Can we have more insight into the dimensions of the water vessel to be measured?

At the extreme,  a lovely woman with a tape measure.  Pleasant to look at and voice output.

Ahh what a wonderful way to know...um the watering needs.

yours
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tAhm1D
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« Reply #4 on: April 21, 2009, 03:47:59 15:47 »

Hi veli,
The attached circuit is self-explanatory. You can adjust this circuit according to your requirement.
« Last Edit: April 21, 2009, 04:10:38 16:10 by tAhm1D » Logged
Virre
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« Reply #5 on: April 22, 2009, 01:32:16 13:32 »

A capacitive sensor will do the job.  There are many ways to do it, here is one.

http://www.discovercircuits.com/DJ-Circuits/capgage.htm
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nawab
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« Reply #6 on: April 23, 2009, 07:17:21 07:17 »

Well I made one for diesel tank. Nothing fancy but used a fuel gauge float from a car (Indian Maruti Suzuki). Interfaced the resistor to A/D input of 16F72 and had a nice bargraph display made of LEDs.
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