I am currently busy with a university project where i will have an experimental setup on the roof of a building at the university, and a PC in a laboratory downstairs(Cable distance approximately 15m). I am using am planning on using an arduino Leonardo and ethernet shield(only have that to my disposal), and wish to send data from the arduino to the PC, already connected to the local network via ethernet. Connecting the arduino via ethernet to the local network via the server is not an option.
What other options do i have to link the arduino and PC(sources say max US cable length is 5m??)
Can i write to an SD card on ethernet shield?
Or if i use a laptop instead, connected to internet through wifi, can i connect arduino directly to laptop via ehternet using cross over connection?