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Connecting a photo interrupter/optoisolator to an Arduino | Martyn Currey
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Patent US6246558 - Circuit interrupting device with reverse wiring
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encoder - Adding indicator LED to optointerruptor circuit? - Electrical
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PC817 Optocoupler Pinout, Working, Applications, Example with Arduino
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encoder - Adding indicator LED to optointerruptor circuit? - Electrical
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photointerrupter schematic details - heliosoph
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Connecting a photo interrupter/optoisolator to an Arduino | Martyn Currey
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Linear opto isolator circuits – Electronic projects circuits | Basic
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opto isolator - Optocoupler input protection - Electrical Engineering