Sorry, but a Newbie question … I’m setting up a Smoothie with separate 5V & 12V PS, a third 24V PS for steppers driven from external drivers. The 3 PS GNDs are tied together, but NOT tied to the Smoothie … only the 5/12V + and - are tied to the Smoothieboard.
The External Drivers I have require EN, STP, DIR and +5V … not Ground
I connected the +5V directly from the PS (same %v PS supplying the Smoothie) … and the STP, EN & DIR as directed in the FAQ … but nothing.
I Tried Inverting the EN … still nothing (Voltage at the EN pin on the external stepper indicates 3.3V)
If I disconnect the EN the driver works … but is jerky, not smooth.
Same if I force the EN High with a pullup resistor from the +5V … but both of these options force the driver to be enables always.
- Is there any danger in keeping the driver always enabled?
- Could the jerky stepper driver indicate that the STP needs to be inverted as well?
- Should I run a separate GND so the external driver & Smoothie have the same GND? Should I tie the PS GNDs to the Smoothie (either a separate GND pin or the -5V)?
Thanks in advance
Imported from wikidot