Wiring Limit Switches - location of capacitor in optocoupler circuit · Issue #1030 · gnea/grbl · GitHub
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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")
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Limit Switch Wiring · Issue #96 · gnea/grbl · GitHub
