My RAMPS, steppers, and Pololu's were sold in one package as a kit. Should I be worried that the steppers I was sent are rated at 2.8V? It looks to me like the RAMPS schematic is saying they will be runnig off of 12V.
you need to calcule the vref setup drivers amps are important to take note of too most common drivers are rated 2a mine are rated at 3v but only sending them at the moment 0.800mv