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[on:]

I have the following project to accomplish, I have to connect an air conditioned to the internet and then controll him through the internet, so I thought to use the arduino. But I do not know how to do it, could you help me?

[Reply #1 on:]

You need to get the schemtics for the AC unit, do some research on ethernet shields and temperature sensors.

[Reply #2 on:]

What kind of air conditioner? What kind of voltage/power are we talking about working with (not that you'll be working directly with the unit, hopefully - but it is something to know about)...?

[Reply #3 on:]

If the air conditioning unit has a remote control, you can program your Arduino to send the right IR commands to start/stop/adjust the unit.

[Reply #4 on:]

An arduino with an ethernet shield and a relay like below should give basic on/off control.

http://www.ebay.com/itm/SSR-25-DA-Solid-State-Relay-For-PID-Temperature-Controller-25A-Output-24V-380V-/180842481825?pt=LH_DefaultDomain_0&hash=item2a1b0d48a1

[Reply #5 on:]

Consider a wifi shield instead of ethernet if you don't want to run cable. They are more pricey though.