And if you separate Z motor enable to one of the last free A pins, you could disable Z motors, because during printing Z is the only one that even can be disabled (because stepper hold its main step positions very well - micro stepping mode is not used if threaded rod is used).
But that is not necessary, only power saving is reason for this.
Has anyone tested, could it be possible to combine Z motor direction signal to any of the zy or extruder motor direction signal? From signal point of view that should be possible, because z motor is never stepped during x or y movement anyway - or is it?
And some information to my previous posts to this topic:
That very tiny PCB combination (33*32 mm sized Atmega2560 and same sized RAMPS) that I made a year ago was halted a one full year, because the company (to whom I made some other PCB layouts) halted the whole project. My tiny pieces were only a filling of empty PCB layout area.. well, that was the reason for their size too.. :)
But now a set of 75 boards are under SMD component placement, so good news are soon to be shown...
Only one working test unit was made, but I burned it when I connect 24V to motors and some spark destroyed first one Allegro motor controller and that flame burst also conducted via control lines to Atmega CPU and destroyed also that.
And back to this topic:
So, a good advice to all schematics designers: A suitable (470-1k) series resistors in all analog and control lines could be good for healthy life of any CPU.... Analog temperature measurement lines can accept even bigger resistors, maybe 5-10k.
But that is not necessary, only power saving is reason for this.
Has anyone tested, could it be possible to combine Z motor direction signal to any of the zy or extruder motor direction signal? From signal point of view that should be possible, because z motor is never stepped during x or y movement anyway - or is it?
And some information to my previous posts to this topic:
That very tiny PCB combination (33*32 mm sized Atmega2560 and same sized RAMPS) that I made a year ago was halted a one full year, because the company (to whom I made some other PCB layouts) halted the whole project. My tiny pieces were only a filling of empty PCB layout area.. well, that was the reason for their size too.. :)
But now a set of 75 boards are under SMD component placement, so good news are soon to be shown...
Only one working test unit was made, but I burned it when I connect 24V to motors and some spark destroyed first one Allegro motor controller and that flame burst also conducted via control lines to Atmega CPU and destroyed also that.
And back to this topic:
So, a good advice to all schematics designers: A suitable (470-1k) series resistors in all analog and control lines could be good for healthy life of any CPU.... Analog temperature measurement lines can accept even bigger resistors, maybe 5-10k.