DIY Switches and others in open source

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(sorry for my English, buit I speak French)

I want to start a little project in automation, almost all in wireless,  
with some switches + lights, a presence detector, and some sensors  
(lights, temperature, ...)

I would like to do this in all open source and all DIY, and use a  
Raspberry Pi (2) and probably some micro controllers.

Do you know a website with a description of open sources protocols for  
home automation, and perhaps some schematics  ?


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