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cnc - How best to connect two optical limit switches to share one I/O pin - Electrical Engineering Stack Exchange
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/i/16356/products/2018-07-29T20%3A00%3A27.543Z-IMG_20180723_165952_277.jpg?1606306133 "CNC Optical Limit Switch Isolator - GRBL from The Eccentric Workshop on Tindie")
CNC Optical Limit Switch Isolator - GRBL from The Eccentric Workshop on Tindie
Limit Switch Wiring · Issue #96 · gnea/grbl · GitHub
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Z axis limit switch problem - Easel - Inventables Community Forum
