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I am looking for a "water overflow pail detector".
It basically will make some sound (e.g. beeping) when the water in a pail was about to overflow.
The detector must also be water-proof otherwise the electrical source to this detector will be short-circuit.

I have a very slow running tap that I used to fill up pail to wash my car.
However, I don't want to sit down there watching that slow tap to fill up the pail and
I also don't want it to overflow if I just went to watch the TV.
Therefore, I need to put that detector on the pail somehow in order to detect if it is about to overflow

I am not looking for a detector to measure the level of the water in the pail or tank or something like in the link - Level of a water tank with a microcontroller

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  • \$\begingroup\$ See update answer re simple electronic circuit . \$\endgroup\$ – Russell McMahon Oct 3 '11 at 10:28
  • \$\begingroup\$ Changed your question to add your extra information. Change again if desired. \$\endgroup\$ – Russell McMahon Oct 3 '11 at 10:31
  • \$\begingroup\$ @RussellMcMahon, Liked the circuit design you provided but I was wondering if there are made-ready device in the market? \$\endgroup\$ – Larry Morries Oct 4 '11 at 1:04
  • \$\begingroup\$ go to the search page that I provided and look at the many images. Hover over images for more details. Some will be selling product. And try ebay, sparkfun, deal extreme, Jameco, ... and other electronic resellers. Which suits depends where you are located. Where are you? \$\endgroup\$ – Russell McMahon Oct 4 '11 at 2:28
  • \$\begingroup\$ If you search on ebay for water level alarm you will find many dozens of products, starting for about $5. \$\endgroup\$ – Russell McMahon Oct 4 '11 at 2:31
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LEVEL DETECTOR TO SOUND AN ALARM WHEN A SLOWLY FILLING PAIL OF ATE RIS ALMOST FULL

  • Google: water level detector circuit

  • Click on "images"

MANY water level detector circuits each with its own web page.

This should suit your need.

enter image description here


A slightly different way:

N1 can also be 74C14, 74HC14 or any "Schmitt trigger" CMOS gates.

enter image description here


This circuit and several others here

enter image description here


Float switches:

Have a look at these images "float switch" .
Each one of these images is hot linked to webpage.

These are probably even more likely to be apposite "float switch" bucket

From the above link:

enter image description here

enter image description here

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Using "float switch" low voltage

This looks about what you want. Discussion here

enter image description here

All these come, as you will have seen if you looked, by using a simple Google search with some obvious terms and then looking at "images". A very powerful tool. Well worth spending the time required to learn how to use it.

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  • \$\begingroup\$ Nice one. Your answer will be mark as the final answer. \$\endgroup\$ – Larry Morries Oct 3 '11 at 8:19
  • \$\begingroup\$ @Larry Morries - Hopefully some of those are useful to you. But, knowing more about what you were trying to achieve may help someone to give an answer that suited your need very specifically. \$\endgroup\$ – Russell McMahon Oct 3 '11 at 9:21
  • \$\begingroup\$ Actually I have a very slow running tap that I used to fill up pail to wash my car. However, I don't want to sit down there watching that slow tap to fill up the pail and I also don't want it to overflow if I just went to watch the TV. Therefore, I need to put that detector on the pail somehow in order to detect if it is about to overflow. \$\endgroup\$ – Larry Morries Oct 3 '11 at 9:28
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A float switch in series with a piezo buzzer and a battery will do what you need. Depending on whether it's ok to make permanent modifications to the bucket, you can either use a vertical float switch on a plank across the top of the bucket, or a horizontal float switch in the side of the bucket. Other techniques for detecting water (conductivity, ultrasound, capacitance, heat transfer) can work too, but they tend to be more complex and expensive than a simple float switch.

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  • \$\begingroup\$ Do you have illustration or pictures to show me that float switch? (It looks very interesting to me) \$\endgroup\$ – Larry Morries Oct 3 '11 at 7:46
  • \$\begingroup\$ More information will get better answers. \$\endgroup\$ – Russell McMahon Oct 3 '11 at 7:47
  • \$\begingroup\$ @RussellMcMahon, Theran answer is quite close to what I want but I need some pictures or illustration to shows me the float switch. \$\endgroup\$ – Larry Morries Oct 3 '11 at 7:54
  • \$\begingroup\$ @Larry Morries - That's what search engines are for. Use SE of your choice and then select IMAGES. If the SE of you choice does not have images, select one that has. A very powerful; tool. Well worth learning how to use it. \$\endgroup\$ – Russell McMahon Oct 3 '11 at 8:17
  • \$\begingroup\$ @Theran +1 as consolidation prize. \$\endgroup\$ – Larry Morries Oct 3 '11 at 8:20

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