GRBL Spindle Control Easy Driver

Hi Open Builds community,

I am building a 3d printer from scrap and am looking to use the spindle control within GRBL to drive an a4988 (Easy Driver) controller to run a stepper motor.

I have un-commented USE_SPINDLE_DIR_AS_ENABLE_PIN in config.h and have experimented with different settings for SPINDLE_MAX_RPM.

I have PIN 13 going to DIR and PIN 11 to STEP on the Driver.

I am able to get the motor to make a high pitched noise by sending a M3 S100 command, if I disconnect PIN 11 the...

GRBL Spindle Control Easy Driver