How do I implement shower time signalling in a cubicle with light and radio?

I was given a task from a friend - a shower cubicle with lights, radio, etc.
He wants it to somehow signal the length (time) of the shower being taken....

He has a large family - and wants to save money on water.

I understand that you would need to give some kind of flow sensor (what kind?),
some kind of controller and possibly a voice synthesiser...

Ideally, it would be possible to do it on EASY (Klockner-Moeller), as I have mastered this controller...
How about something simpler?

Any suggestions... ?

It can do this indirectly by measuring the humidity in the bathroom.

Or perhaps the easiest way is to set the alarm clock before taking a shower for, say, 5 minutes.

No, it has to be 'something' to show off to your friends....
No such medieval methods....

Every water meter has a magnet inside. Simply dismantle the measuring section and fit a reed switch or, for the ambitious, a Hall sensor. Perhaps you should measure hot and cold water separately. Then you take any woman and make her bathe for an hour. You count the pulses and have a starting point for the measurement.

Well, that's what I would like to have, some kind of ready-made sensor, typically available on the market.... With known parameters and typical applications e.g. central heating boilers.
Maybe there are some with relay output?

darekpawel wrote:

No, it has to be "something" you can show off to your friends...

So your friend should hire a bathroom eunuch who, in addition to preparing the bath, will count down the time by reciting stanzas of "Pan Tadeusz" and turning the hourglass at the appropriate moment.

Is the notification to cancel the turning off of the water for a moment?

Well, on the whole, yes, but some options will probably come out in practice.... So as not to turn off the water when a woman has shampoo on her head, and give her another three minutes to rinse it off....

P.S. With this eunuch it's O.K., but where to find one? Unless a colleague feels like changing his philosophy of life!

kortyleski wrote:

Every water meter has a magnet inside. Simply dismantle the measuring section and fit a reed switch, or for the ambitious a Hall sensor. Perhaps hot and cold water should be measured separately. Then you take any woman and make her bathe for an hour. You count the pulses and have a starting point for the measurement.

Water meter with pulse output. You already have a signal ready. 1L resolution.

eurotips wrote:

Well, yes, but a litre of cold is 4£ and a litre of heated is 24£ (That's how it is at my MPEC).

A cubic metre?

Gentlemen, I read this and I don't believe my eyes, I didn't know you could save money on your body cleanliness. Paranoia.

The best way to do this is to set a transparent bottle over your head, which is supposed to last for the whole bath. The gentleman can see how much he has left, etc. Alternatively, the same thing but electronically, e.g. after 3 litres an electro-valve nudges the water supply to the point where the shampoo can be washed off

Ryszard49 wrote:

Gentlemen, I'm reading and I don't believe my eyes, I didn't know that you can save money on the cleanliness of your body. Paranoia.

It's not about saving money
After all, it's not about saving money but, as the author wrote, about being able to show off. After all, the cost of the installations needed will be so large that it will not pay for itself in a reasonable time.
Maybe use something like this: http://gadzetomania.pl/37425,prysznic-na-pieniadze

Returning to the technical aspect, it is my opinion that the notification should be cancelled by switching off the light. This will solve two problems:
- detecting that a new person is using the bathroom (in most cases)
- do not allow someone who happens to be taking a shower to easily cancel the notification

TvWidget wrote:

Back to the technical aspect, in my opinion the notification should be cancelled by switching off the light.

Rather a blinking light. First 2-3 single and e.g. after a minute continuous. Turning it off permanently can cause panic in the bather.
The main disadvantage is that if a new person who knows nothing about the saving system uses it, it's a flop. A better idea is to gradually reduce the hot water supply or to "flash" the hot water. Short bursts of cold water alternating with warm water firm the skin and toughen the body

vodiczka wrote:

Rather a blinking light.

You misunderstood. I was referring to how to delete the notification. That is, when the timer used to determine that you have been showering for too long should start counting the time again.

I have just tracked down such a sensor: YF-S201


https://www.olimex.com/Products/Components/Se...201/resources/Water_flow_sensor_datasheet.pdf

The price is about 25.0zł; it is not exorbitant....