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Author Topic: Starting my first project  (Read 3281 times)
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Water Solenoid Electric Valve - 12V DC 3/8" Normally Closed 2-Way for Air, Gas, Diesel Oil good to 80°C
http://www.virtualvillage.com/3-8-electric-solenoid-valve-for-water-gas-diesel-12v-dc-001540-031.html?utm_source=googlebase&utm_medium=shcomp
or
http://compare.ebay.com/like/300530254950?var=lv&ltyp=AllFixedPriceItemTypes&var=sbar&rvr_id=219285844334&crlp=1_263602_309572&UA=WVF%3F&GUID=c15d49fb12c0a03662039833ffdc1833&itemid=300530254950&ff4=263602_309572

I'm sure you can find others like the ones used in dishwashers and so on. Pexal won't bang like metal pipe and should take a sudden change. But if it is a problem you can use an arrester like these
http://www.google.com/products/catalog?q=water+hammer+arrester.&hl=en&client=firefox-a&hs=hHY&rls=org.mozilla:en-US:official&prmd=ivns&biw=1590&bih=855&bav=on.2,or.r_gc.r_pw.&um=1&ie=UTF-8&cid=4373672689626390701&sa=X&ei=O6iFTZ3KK8XPgAeypLHNCA&ved=0CGIQ8wIwAA#

To read the temp I would use a(ds1820b) lots of sample code and simple to use over cat5. I'm not an electrical engineer but I'm pretty sure you could control the valves using a relay or mosfet on the same cat5 line. The valve being powered at each radiator.

I am currently building a automotive hvac control that does pretty much what your looking to do. Most of the code is done and I'd be happy to share it with you.

For display I'm using 7segment leds and a max7219 to drive them. I bought the max7219's on ebay http://cgi.ebay.com/MAX7219-MAX7219CNG-8-Digit-LED-Display-Driver-IC-DIP-24-/260581860674?pt=LH_DefaultDomain_0&hash=item3cabe3a542 you will need 6 7segment leds to display 3 rooms this chip will handle 8 so you could also read outside temp. with 8 . The Arduino Uno will be more then enough to take care of your system. And for a few bucks you can replace the uno with a standalone atmega 328 and have you arduino for the next project.
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Forgot your displaying in °C  so your going to want 3 digits for each room to display the decimal. so you'll need 2 max7219's. I love this chip easy to hookup and easy to code.
3 digit 7segment displays like these with common cathode
http://cgi.ebay.com/10x-0-56-3-Digit-Red-LED-Display-Common-Cathode-12pins-/320537737104?pt=LH_DefaultDomain_0&hash=item4aa189b790
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I did a quick video of my project



Displays in °F or °C can adjust temp between 60°F and 90°F .
You'll notice the mode door that is activated via servo as temp is adjusted.
The led panel is temporary to represent actuators on the A/C unit.
Hope it helps

Mike
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