How to pick up the signal using the 433MHz popular receiver? I use OpenHab and Raspberry Pi 2.
You need to find a library that runs on the Pi 2 that knows how to communicate with those chips. The library docs should tell you how to wire the to your GPIO pins. Then using that library you must create a program that uses that library to send/receive messages to both openHAB and the transceiver, sometimes called a gateway.
It might be easier to look into one of the transceivers supported by the RFXCOM binding instead.
Also see: