Hello!
I'm building a plotter with one of these grbl shields.
All works fine but when I wire up the limit switches they are behaving quite strangely.
When all is connected up they will trigger instantly if close to a powered motor. Things I've tried:
-
Testing the continuity of the switches and their cables with a multimeter - The switches do not appear to be conducting when not engaged.
-
Disconnecting motors - The switches do not trigger undesirably, but do work as expected if I manually press one
-
Disconnecting power to board but connecting motors (keeping usb power) - The switches do not trigger undesirably, but do work as expected if I manually press one
-
Removing switch from assembly and powering everything - The switch does not trigger until I move it close to the motors.
So it seems like proximity to powered motors is triggering the switches. Is this a thing?
Thanks!