Wiring two stepper motors on one stepper driver
I’ve had a couple of questions about whether its possible to drive two stepper motors with one driver, for instance to control a printer such as Prusa I3 or similar which uses two stepper motors on the Z-axis. The answer to that is yes. Just make sure the two stepper motors are equal. If the stepper motors are the same, the coil resistance should also be more or less the same and the power should distribute equally among them. You will then have to program the peak current to be double what you want for a single stepper motor.
Controlling a solenoid with Replicape
I’ve also been asked if it’s possible to control a solenoid with Replicape. And you can do that as well, using one of the free mosfets, either a high power mosfet or one of the low power ones. Solenoids are sometimes used on 3D-printers to extend a micro-switch below the print head nozzle for automatic bed leveling. Unfortunately I have thrown away my only solenoid, but a coil functions in much the same way by physically moving a piece of metal as a result of power being applied to the coil.
The low power mosfets have a maximum current of 1.3A giving a max power coil of 15W @12V which is more than most people would need for a bed leveling solenoid, but if you do need more power, the big mosfets go up to 32A which is 384W @12V. That will blow the 20A fuse, though.