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WHO USED ALL THE HOT WATER!!! Need a simple temperature data logger ** UPDATE **
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AndyBeez:
What next, a shaft encoder to calculate how much toilet paper is being consumed and by whom?

Dedicate your resources to defining a heating system that meets the needs of the users, rather than farming data on people whose only crime is using soap.

This might be an interesting project, but are you involved in someone elses witch hunt?
Brumby:

--- Quote from: AndyBeez on August 21, 2023, 09:35:41 am ---What next, a shaft encoder to calculate how much toilet paper is being consumed and by whom?
--- End quote ---
That is another sore point in this household.  I'll say no more on that.


--- Quote ---Dedicate your resources to defining a heating system that meets the needs of the users, rather than farming data on people whose only crime is using soap.
--- End quote ---
So you consider the selfish use of all the hot water for the household and then deny any responsibility for it as an honourable activity?


--- Quote ---This might be an interesting project, but are you involved in someone elses witch hunt?

--- End quote ---
It's not a witch hunt.  The guilty party is well known, but they are bold and brazen in their denial.  I am looking to provide definitive evidence that they cannot deny.

There is far more detail to the background that is not appropriate to share here, but let me just say that anyone who wishes to criticise the exercise for social reasons is doing so out of ignorance.
AlbertL:
Here are some water meters with pulse outputs, that you could us together with a temperature sensor to make a BTU meter: https://www.ekmmetering.com/collections/water-meters
Kim Christensen:

--- Quote from: Brumby on August 21, 2023, 06:26:33 am ---
--- Quote from: Kim Christensen on August 21, 2023, 05:26:10 am ---So the householder knows who is in the bathroom and exactly when they enter and exit. Yet this same householder cannot tell if the water is running or not?
--- End quote ---
They have a security camera that covers a section of the hallway that must be traversed, so they can see who goes in and when. It does not listen for water.


--- Quote ---Good luck with your project, but I doubt it'll provide much useful data beyond what could be gleaned by some intelligent observation.

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So your criticism comes from the unrealistic expectation that someone is always waiting and watching every day over the whole time someone might just use the bathroom.  Geez - it's not like they might actually have other things to do, like going to work.
The combination of recorded image and data allows for post event review.  If someone complains, then pull up the temperature data and check the camera footage for the times indicated.
Please consider the practical aspects of addressing a problem before being so dismissive.

--- End quote ---

Kind of hard to do since this is the first time you've mentioned the camera. Now that we know this, your precise timestamping of pipe temperature makes more sense.
So another idea is a vibration sensor attached to the pipe listening for water flow. This will give a faster response than temperature. If the security cam has a microphone input, you could even feed this "audio" into it and have everything in one recording.

Zero999:

--- Quote from: Brumby on August 21, 2023, 01:01:04 am ---
--- Quote from: themadhippy on August 21, 2023, 12:56:21 am ---Just cut to the chase an fit a timed shower valve,whoevers hogging te hot water will soon get bored of pressing the button every 20 seconds

--- End quote ---
Yeah... nah.

That is going to piss off EVERYONE who uses the shower.  Revolt guaranteed.

--- End quote ---
Set the timer for something more realistic, say 5 minutes, with a 5 minute delay before it can be triggered again. A push-button, solenoid valve, a DC PSU, microcontroller and a push-button with an IP rating of 67 will do.
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