get the mega and i would make sure it is a real one and not some knockoff from ebay as some are good but some will give you more trouble and it just isn't worth the hassle. i have one in the utility room next to the HS3 computer so i just used USB for it but the others are around the house so use Ethernet shields for them (keep in mind that they take several pins so with the Uno you don't have a ton of free pins with the Ethernet shield)
i use mine for lots of things
-most of the motion detectors in the house (bosch gen 2 quad)
-sensing the smoke alarms and sprinkler system
-controlling all the zone valves for the in floor heat
-controlling the blower and boiler
-it will also have all the one wire temp sensors for all the zones (haven't connected them yet)
-kitchen hood temp sensor to control exhaust fan speed
-electronic door strikes
-solder bench controls, exhaust fan and damper, solder iron, hot air, outlet strip etc.. i have one button to turn on/off each thing and a motion sensor that will shut them off if i forget
-plant watering valve
-sprinkler tank fill/overfill sensors
i am sure there are a lot i have forgotten but i love them
here are some things that i think are worth ordering as well
Prototype Screw/Terminal Block Shield Board Kit For Arduino MEGA-2560 R3. D269UC
they make things so much easier are are only $15
also these are well made and you can invert them with a jumper
12V 24V 8-Channel Relay Module with Optocoupler H/L Level Triger
http://www.ebay.com/itm/5V-9V-12V-24...item56688daf17
i use mine for lots of things
-most of the motion detectors in the house (bosch gen 2 quad)
-sensing the smoke alarms and sprinkler system
-controlling all the zone valves for the in floor heat
-controlling the blower and boiler
-it will also have all the one wire temp sensors for all the zones (haven't connected them yet)
-kitchen hood temp sensor to control exhaust fan speed
-electronic door strikes
-solder bench controls, exhaust fan and damper, solder iron, hot air, outlet strip etc.. i have one button to turn on/off each thing and a motion sensor that will shut them off if i forget
-plant watering valve
-sprinkler tank fill/overfill sensors
i am sure there are a lot i have forgotten but i love them
here are some things that i think are worth ordering as well
Prototype Screw/Terminal Block Shield Board Kit For Arduino MEGA-2560 R3. D269UC
they make things so much easier are are only $15
also these are well made and you can invert them with a jumper
12V 24V 8-Channel Relay Module with Optocoupler H/L Level Triger
http://www.ebay.com/itm/5V-9V-12V-24...item56688daf17
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