Thanks a lots for all your explanations!
Yesterday evening, i followed "youtube" video on SDR-Radio to look in the 433 Mhz area.
Now i understand what you called "waterflow".
I saw that people record a wav file with SDR and then used audacity to determine 0 and 1 bit.
My question, is now on the final step. If i know that my weather station speak on 433Mhz Channel 1, that is to say 433.075Mhz (following your wikipedia link)
How can i read this 433.075Mhz with a raspberry-pi or arduino ?
What kind of RFComponent do i have to wire on my arduino or raspberry ?
Is a 433Mhz cheap receiver (like the one i bought) is able to read from channel 1 (433.075Mhz) to channel 37 (433.975Mhz) ?
Thanks a lot
You mean "waterfall". Good that you are able to visually see what the SDR dongle and a PC can do.
The next step is to find a receiver that is DOCUMENTED to be centered on channel 1. Cheap receivers may be able to receiver over a broad range of channels. Receiving poorly on all of them. You want to find one that is centered on channel 1. Some receivers may have the ability to be slightly tuned manually to channel 1. You will have to be sure that is possible.
What you are doing is called "reverse engineering". It is much more difficult than engineering a product in the first place.
To make things more complicated, you will need to determine the modulation scheme of the weather station. That refers to how the digital weather information is added to the channel 1 RF signal. Called modulation. The SDR receiver video you saw may help you determine the modulation scheme.
The receiver you finally get will have a digital output that will connect to one of the digital input pins on your Arduino and then the software there will need to convert the bits to ASCII characters. Perhaps the Arduino serial input code will work.
Without seeing the documentation on your current receiver, there is no way to tell what it is able to receive.