| http://www.w3.org/ns/prov#value | - You would want at a minimum limit switches at each end, so that if for some reason there is a problem or error, you do not over-travel in either direction - which could break the mechanism, motor, drive electronics, etc (if you didn't want switches, you might try monitoring motor current instead - though that is more complex, especially with a stepper, depending on your driver electronics).
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