For my school project I will make a robotic arm that will draw an equation.
I will use RAMPS on top of DUE, what is the difference between RAMPS 1.4 and RAMPS-FD?
I'm not sure about the ramps-FD, but from what I have read you -cannot- use the ramps 1.4 on the due because it uses 5v instead of 3.3v. I however have been using a work around for driving my robot.
I pulled the pololu 4988 stepper drivers off of the ramps 1.4 board and put them on a breadboard. The wiring is relatively easy if you follow the diagrams online. The ramps 3.3v digital outputs are able to step the motors successfully via the pololu driver (assuming you are using stepper motors).
The only downside is that it is less compact and a little uglier. You also need to buy a 100uF capacitor to put across the power supply leads (i got mine at radio shack).
Better late than never with the response hopefully. PM me if you have any questions about it, I probably won't get a notification if you respond here.