I am using my own PCB with a Amega32u4, I would like to add a 7 segment display in place of my current 4x neo pixel that uses a single pin (d4) and cant find a display to work in the same way. Looks like my only option is to use a shift register. I have every last pin used up and already have PCB made up so trying not to swap a bunch of pins around and make major changes as my code and PCB design works perfect. The problem is I have a MCP2515 that currently uses SCLK, MOSI, MISO and INT1(d2). How would I go about hooking this up on the Amega32u4 side and what other pins could I use?
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