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1  Topics / Home Automation and Networked Objects / Re: Bathroom automation and waterproofing devices on: April 22, 2014, 01:58:15 am
If you drill a hole in the pipe ... you will certainly have a leakage ... maybe not at the begining ... but it will leak due to the pressure inside the pipe, the temperature variations
I see, that makes sense.

If you don't know what a megapascal is, which I guess is very likely, ask your mother.
I'm getting a bit offended here. What is this "ask your mother/father" thing? Do I act in any way imposing that I am 5 year old?
2  Topics / Home Automation and Networked Objects / Re: Bathroom automation and waterproofing devices on: April 18, 2014, 06:30:41 am
Could you please elaborate why not? Is this about an insulation degradation from contact with water or something like interrupting the water flow in the pipe? My dad is not very good in plumbing, either smiley

I am still in the research phase, so I will consider getting readings from outside the pipes. It will be interesting experiment to see the differences between the two methods and I might do it.
3  Topics / Home Automation and Networked Objects / Re: Bathroom automation and waterproofing devices on: April 18, 2014, 02:07:06 am
Thank you! All of this has been very helpful and insightful.

What is thermostatic mixer? Huh, this is exactly what I am trying to re-invent smiley I didn't knew that thing existed and it seems like I am re-inventing the wheel... but anyway, I will try to do it. I have never seen those in our hardware stores. We have only static mixers.

I've got a bunch of DS18B20s from ebay for cheap. I am using those in other applications as well, and got them really cheap. $8 for a probe seems kinda too much, so I would try to waterproof them myself. First try with hot glue proved unsuccessful, so next step is bathroom-grade silicon.

Our pipes are copper + plastic. Plastic pipes are used a lot, so I thought I could drill a hole in one of those and stick a sensor inside. Then insulate the hole with hot glue or silicone. Like the thermowell concept. I think it would provide faster thermo response than if you stick the sensor outside the pipe. Plastic pipes are not very good thermal conductor.

you do not want to PWM a solenoid as you will very very quickly kill it. you want to use something like this:

This was my concern as well. But is this product variable valve? I read it is for on/off applications.
4  Topics / Home Automation and Networked Objects / Bathroom automation and waterproofing devices on: April 16, 2014, 05:21:48 am

I've searched the forum, but didn't found any relevant bathroom-related projects. I want to make a shower that keeps the user defined temperature and flow. My shower mixer is a mess when it comes to manually adjust the knobs - it has two states - arctic freeze and hellish hot.
I imagine this project to have 2 valves (1 on hot water, 1 on cold water) mixing the water, 2 DS18B20 temperature sensors (1 on hot water, 1 on the mixed output) and user controls for setting the desired temperature and flow power. There will also be a hall flow meter and a LCD. I have read on the topic of PID controlling and I am eager to try it.

There are couple of unknowns for me.

1. I will have to put a temperature sensor in the pipes. I don't know anything of pipes and water works. Of course everything will be tested properly on the bench before I'm going to ruin the actual shower smiley The question is can I waterproof the sensor with hot glue? Or should I use only bathroom-grade silicon?

2. Most of the solenoid valves I've seen have two states - open and closed, but I will need a flow control. Like 10% open or 50% open. I've read this can be accomplished with PWMing the valve. Is any valve suitable for this? Won't PWM drastically reduce the valve lifespan?

3. Housing for the mcu, display and wiring. I suppose any IP66-rated case will do the work? I am concerned of condense within the box.

4. Water resistant potentiometers for defining the temperature and desired flow. I have not seen any in the shops. Can you direct me to something? I think I'm getting the search terms wrong.
5  Forum 2005-2010 (read only) / Troubleshooting / Re: Sketches can not be called main Change of IDE 22 on: January 22, 2011, 10:57:32 am
It seems sketches named 'Tone' do not compile as well. Same errors.
Maybe the common rule is that the sketch name must not repeat any of the reserved words or function names...
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