I am an undergrad student at electric and electronics engineering.I have a course project at analog electronics which is to make an electronic faucet with photo transistors.I have an idea how to operate while hands come close but i don't have an idea how to control the water. Any help will be grateful.Thanks anyway.
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Search your own house. Good chance you find a machine that somehow takes water, all automatically. Next step is to find some screwdrivers and explore the inside of the machine.
-- Thanks, Frank. (remove \'q\' and \'.invalid\' when replying by email)
Visit your local scrapyard and have a rummage around.
Take some old washing machines or dishwashers to bits - they have to switch the flow of water on and off, so they should be useful.
You will have to do some thinking to find how they work, but that should be educational or at least fun.
Junk washing machines water valves and lawn sprinkler control valves would probably be the inexpensive things to check.
It would be more interesting to make them more "linear", (i.e. regulating temperature). Digital is so obvious. ;-)
-- Keith
Make sure you use a grid leak detector before calling the plumber but after using the bit bucket.
Just get one of these and copy it :-)
They make regulating faucets, however they don't have any of your electronic gimcrackery and LED/LCD gewgaws. I think they use a bimetal to work the mixing valve. No electrical power required, in any case.
Best regards, Spehro Pefhany
-- "it\'s the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com
Probably a wax cartridge?
Anyway there are faucents that detect hands coming nearby. The interesting thing is the low power: they are battery operated. One claims a 1 year running time running on 4 AAA batteries and 4000 operations per month.
Thomas
My wall switch timer for electric lights uses a tiny electric motor and a gear train and cam to operate a microswitch. A single AAA alkaline battery powers it for something like a year. It will switch
120, 240 or whatever, the microcontroller and all runs from the single cell, so the microswitch is the only thing that needs to be connected to the outside world. The circuitry wouldn't even have to be hot if they didn't use the NC contact of the microswitch to tell the micro the switch state.It also turns the lights on at a calculated dusk time based on the calendar and approximate latitude. Not bad for $35 US.
Best regards, Spehro Pefhany
-- "it\'s the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com
They're installing proximity sensors on the toilets/urinals at work. I was wondering if this was a ploy by the plumbers' union. ;-)
-- Keith
The electronics is only 1% of it, the rest is manufacturing, regulatory, and practical ( such as single IR beam does not work too well on detecting hands with too much pigment). Some context background:
Forgive me for being brutally honest, but has anyone actually used an electronic faucet? They're horrible! They're very unreliable. They often are either slow to react, or they don't turn on at all, or they stay on after you've left and waste a lot of water. The sensor design sucks big time.
To improve reliability may require a far IR (motion) sensor, as apposed to a near IR sensor. It also instead of trying to sense the hand in the sink and having to deal with water and dirt, it might be easier to sense the person's body or arm or the area around the sink. Failing that, a better choice might be a non-optical sensor, like ultrasound, or a capacitve sensor, or an electric field sensor, which as I understand it, senses capacitance to ground by driving an antenna with a 100 kHz sine wave.
But what is an electronic faucet supposed to achieve anyway? It seems like an aweful lot of trouble just to save one twist of the wrist, and they're probably more expensive than a standard faucet. Any engineering school worth a damn ought to teach how to ask these critical questions about design!
Why not just use a normal faucet, or maybe use one that can be operated with a foot pedal?
good luck. Sincerely, M
The link that FBloggs posted indicated a quick ROI (6 months) and continuing savings on water and water heating costs. People don't (can't) leave the taps on, they can't easily fill the sink with water and shave, they can't pick how hot the water should be, overshoot and have to waste all kinds of hot water.
I suspect a button which gives you an ADA-compliant 10.01 seconds of dribbling lukewarm water would do as well or better. Just have to make the actuator wheelchair accessible and they can eliminate those long paddle handles on the taps.
Best regards, Spehro Pefhany
-- "it\'s the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com
Don't be silly! Its the toilet scrubber's union who's behind this scam. ;-)
-- Service to my country? Been there, Done that, and I\'ve got my DD214 to prove it. Member of DAV #85. Michael A. Terrell Central Florida
Nah- it means they're tired of dealing with your sh_t.
That would be way too practical. Like the stick shift in a car (I'd never buy anything else...).
Regards, Joerg
Hello Kryten,
Fridges with ice and cold water dispensers are easier. They have two valves as a paired assembly and those are right on the back. Takes about
30 seconds or so to remove. Been there, done that after ours quit working and a neighbor had to pay almost $150 for that repair. Cost me $43 plus tax for the part and considering the cheesy plastic construction I thought even that was outrageous.Regards, Joerg
You don't have to drive in bumper-to-bumper traffic.
...Jim Thompson
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