I have found the following link http://openenergymonitor.org/emon/node/3884, that will connect the raspberry Pi to EmonTx via serial.
What I want to find out is that is it possible to put the RFM12Pi board 10m away from the raspberry Pi through some sort of cable? (I know it sounds crazy, why would I want to do that it right? It's just for fun) How can I achieve that?
From the looks of it, I know one side of the cable has to be female(for the Pi), the order side is male(for the RF board). I am not too sure about the name of the cable, type of connection, max. length it can achieve and subjectivity to noise level.
Anybody can point me in some direction so I can understand more about it?
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Re: Connecting an RFM12Pi to raspberry pi via serial(just for education purposes)
Read up about the GPIO interface used on the Raspberry Pi, and its limitations - especially the bit about capacitive loading. Consider how 10 m of distributed capacitor and inductor will affect the data transmitted between the Pi and the RFM12Pi (because that's what a cable looks like to fast digital signals).
If you want to try, you'll probably need to make up a cable yourself, using a small pcb and header pins. I cannot remember ever seeing a cable-mounted IDC, or indeed any sort of cable-mounted male connector, which is what you need.
Re: Connecting an RFM12Pi to raspberry pi via serial(just for education purposes)
Thanks Robert Wall for the reply! That's really helpful. :)
I will see what I can learn from the web about capacitive loading.