I want to connect second arduino nano so I can send logs there and store in SD card. I can't write to SD in my main arduino nano as I don't have enough free memory for buffer.
The issue I "may" have is that is I used all my A* pins and need to use D10-12 to connect some sensors, if sensors don't use SPI protocol, what will happen if I use SPI header pins and D10-12 simultaneously