I am working on a printer with a new type of extruder that doesn't feed material as a linear string but instead
pushes on a spray can, and to have accurate pressure, I am going to use a load cell with its amplifier .
I am using a Smoothieboard and will eventually have to add additional modules to the firmware to
- read pressure information
- adapt extruder position based on the pressure and timing (instead of using simple stepper motor distance)
What pins do you suggest I use for that? I read that I should use GPIO pins, but which ones are these?
There seems to be many (more than 13) free pins around the board, so I am confused as to
which pins are the free GPIO pins.
Thanks for any clarifications and/or hints.
 SparkFun Load Cell Amplifier - HX711 (as new user, I cannot post links yet, it's on sparkfun's website, product 13230)