I am using the grblDuino UNO on a 3 axis CNC setup. I was able to set it up, home it, do some light jobs. I started getting false hard limit alarms ( Alarm 1), doesn’t specify the axis, stops the job and I have to reset. It’s gotten worse that now when I even turn on the spindle (ryobi tool- like a Dremmel) the alarm kicks off. I went with the grblDuino Uno Shield to eliminate issues I read about with limit switches. Do you have some suggestions to help me isolate the issue so I can get the unit back up working?
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