UK switch using water

[tarphenry]

I want to use water to switch on a 12 volt buzzer in my car. A container with 2 contacts, when water is added the circuit is made and the buzzer sounds. Is this possible ,practical. Your help will be appreciated

 

[Pete999]

What is the exact purpose of this engineering project?
[automerge]1577724592[/automerge]
Got me baffled

 

[Lucien Nunes]

Water sensing circuits are available as product, from literally pennies for a hobby grade circuit, up to hundreds of pounds for an industrial unit e.g. for boiler water level control. Beware any uber-simplistic approach that puts DC across the electrodes as this causes electrolysis; all proper circuits use AC. Note that there are other ways to detect the liquid that don't pass a current through it, such as ultrasonics (e.g. Squing), optical, and the good old float switch.

Just search for water level sensor!

 

[Marvo]

It's unlikely just water will conduct electricity enough to complete the circuit. You'd be better making a small circuit with a transistor, a potentiometer and a couple of resistors.

 

[DPG]

I'll need to dig out my Bernard Babani's book of op-amp circuits!

 

[Pete999]

I'll need to dig out my Bernard Babani's book of op-amp circuits!

Never read that one

 

[DPG]

Never read that one

The Babani series of books are well known amongst electronics enthusiasts who were around in the 1980s.

Lucien and Marconi will know them, although they will be a bit basic for those guys!

 

[telectrix]

a float switch is the simpest solution.

 

[DPG]

Intrigued to know what this arrangement is for. Do you have a leaky roof and need to operate a bilge pump?

 

[littlespark]

Alarm to know when auto coffee machine has filled the cup?

 

[PEG]

I had a Rover SDI V8,which could have done with one,in the glove-box...

 

[FatAlan]

Learnt to drive in a 1968 MG Midget. Could always tell when it was raining due to the constant drip on my right leg.!