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16  Using Arduino / Interfacing w/ Software on the Computer / Re: Sniffing RAW wireless data (433MHz, 868MHz; FSK/ASK) on: February 09, 2013, 09:56:31 am
Have a look at the CC1101, lots of cheap modules available, supports 2FSK, GFSK, 4FSK, ASK, OOK and MSK modulations, FEC, data whitening, manchester encoding and data rates ranging 0.6 - 500Kbps. However most modules only work at around 433MHz. For FSK modulations you will also need to know the frequency deviation. Bandwidth will also effect things, too narrow and it won't be able to pick up the entire transmission, too wide and it may pick up multiple transmissions.
17  Topics / Home Automation and Networked Objects / Re: help code relay on: February 07, 2013, 01:33:47 pm
From what I understand you want the 220V mains to turn on a relay which will turn on a lamp via the arduino, in which case you only need a single relay - connect the coil to 220V (make sure the relay coil is meant for 220V AC) and the switch contacts to the lamp & power source of the lamp.

If that's not what you meant then a circuit diagram may help.
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