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'[PIC]: Project Idea :- Water Mixer Controller '
2001\05\01@201757 by Gennette, Bruce

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Project Idea :-  Water  Mixer  Controller  (Temperature)

A small, cheap, modular device to automatically adjust the mixing of hot and
cold water to produce a desired water temperature when a mixer valve is
opened.

Applications :-
Domestic - pre-set bath temperatures for babies, children and elderly,
pre-set dishwashing water temperature, pre-set washing machine
temperature(s), etc.
Industrial - car wash, process control, . . . actually lots and lots of auto
temperature applications, and not just for water (how about mixing hot and
cold fuel to the optimum injector temperature?).

Features :-
Powered by the temperature differential in the two input streams.
Controller easily replaced WITHOUT dismantling the tap (faucet for the
Americans)
Software to be fault tolerant, supply water temperature variation tolerant
and FAIL SAFE.

First Thoughts :-
* Powered by a thermopile (series of thermocouples) in the supply streams
feeding into a super cap. [Mounted semi-permanently in the tap]
* Input / Output monitoring by thermocouples.
* Output monitored by a small bellows which trips an over-ride spring if too
hot (re-set button required).
* Controls a solenoid by pwm through a H-bridge to drive it to any of
thousands of positions. The solenoid moves the middle plate in a ceramic
slide gate to control the mixing of the two streams. (Ceramic slide gates
have high friction, so will remain in place without needing the H-bridge to
hold the 'set' position) . [Mounted semi-permanently in the tap]
* PIC to monitor and control the whole system. [Mounted in a socket at the
rear of the tap]
* Long-life, rechargeable, low power battery built into PIC module.


Electronics Desired (whished for?) :-
A low voltage microcontroller with at least 2 analog inputs, 2 outputs
(operate the failsafe and to charge the battery) and a pwm H-bridge output.
Standby power source (battery), solenoid operating power source (thermopile)
and power storage device (super cap).


Any thoughts Piclisters ?

I can see a market for billions of these if it is possible to make them
cheaply enough.

Bye.

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2001\05\01@203415 by Brent Brown

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> I can see a market for billions of these if it is possible to make them
> cheaply enough.

Can I have 1 (one) please?

...Nah, just being smart. Lot's of good ideas in there, I'll think about
it. Have seen nice gas ones with LED display of temp, simple
keypad, mains power I'm sure though.

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2001\05\01@224710 by Bob Ammerman

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First idea:

Eliminate a lot of the electrical energy required by powering the mixing
actuator hydraulically using mechanical amplification.

Bob Ammerman
RAm Systems
(contract development of high performance, high function, low-level
software)

{Original Message removed}

2001\05\01@224728 by Bob Ammerman

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Second idea:

Have several presets on it, so that each family member can preset their
desired shower temperature independently.

Bob Ammerman
RAm Systems
(contract development of high performance, high function, low-level
software)

{Original Message removed}

2001\05\02@092443 by Russell McMahon

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> > I can see a market for billions of these if it is possible to make them
> > cheaply enough.
>
> Can I have 1 (one) please?
>
> ...Nah, just being smart. Lot's of good ideas in there, I'll think about
> it. Have seen nice gas ones with LED display of temp, simple
> keypad, mains power I'm sure though.

I've often wondered about the wisdom if this - does your gas powered hot
water stop working when you have an electric power failure :-) ?



Russell McMahon

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2001\05\02@172043 by Peter L. Peres

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Bimetal tongue or diaphragm valve. Been around for at least 100 years and
there must be at least 50 versions of this doing things from setting
mixture in small engines (automatic choke) to syrup and liquid food mixing
(including water etc). Some come with a knob so you can preset the desired
temperature. I think that some high end bathroom fixtures have this built
in. An Italian manufacturer comes to my mind (but I forget the name).

Peter

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2001\05\22@051637 by Alan B. Pearce

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>I've often wondered about the wisdom if this - does your gas powered hot
>water stop working when you have an electric power failure :-) ?

Yeah, mine does because it uses the mains power to drive the solenoids that
the timer and thermostat control!!!!!!!!!!! - just as well I do not live in
California, but then I guess I would not need the heating anyway.

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