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