Quote:
Originally Posted by Darwin
I doubt a limit switch would do any good...by the time that which you don't want to move does move, the damage has already been done.
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It depends on how precisely you place a limit switch.
And further.... There is an Arduino with a huge number of sensors that you can select and install: magnetic, ultrasonic, infrared and so on. There is remote control by wi-fi module. This is an endless field for creations.