im building a project with multiple X27 steppers datasheet and a controller that can not provide the needed current savely (I know it’s not a lot, but I have a lot of motors).
Does anybody have experience of using driver boards for the X27 stepper? I can not find a suitable board because most projects just connect them directly.
I am searching for a board that has a small footprint (because there will be multiple) and found the A4988 but the board is pretty much an overkill for such a small current motor.
Most current controlling drivers can't be set low enough for these 20mA motors.
I see no need for stepper drivers for these high impedance automotive steppers. They can be driven directly with a basic H- bridge. I would be inclined to drive them directly from an Arduino pin (4 pins per motor). Or with 74HC595 shift registers (one per two motors).
See this page..
Leo..
Edit: Note that an X27 stepper needs an unusual 6-step sequence, which most srepper software doesn't do. There are special libraries for this motor.
The is dedicated chip for the x27 that can operate 4 motors separately - you need to google ( I can’t recall it) .
It operates with out a library - one pin sets direction , another you send pulses .
But what's the point if you can drive the motor directly from an Arduino pin.
True, moving the step sequence to hardware could simplify the Arduino code and reduce thenumber of pins used. I guess the choice depends on the number of motors in the project and your coding skills.
Leo..
