The limit switch pairs go in the square loops in the diagram (one shown open circuit = triggered) D1, 2 and 3 are the internal opto-isolator leds, and the opto-isolator output transistors (not shown) ...

We’re used to thinking of limit switches as a mechanical device that cuts the motor connection before physical damage can occur. [Anthony] decided to try a different route with this project. He ...

You use limit switches to switch off a motor if it reaches one of its two end positions. Even if you build a microprocessor-based motor controller, you should switch off a motor with hardware by ...