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Shop optocoupler arduino

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$5.88
1Pc Green 1-Channel PC817 Optocoupler Isolation Module Optoelectronic Isolator Signal Isolation And Anti-Interference 3-5V 12V 24V Optocouplers
Amazon.com
$5.88
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DAOKAI 10PCS Comparator Speed Sensor Module LM393 Chip Motor Measuring Slot Type IR Optocoupler For Motor Speed Detection Also For MCU Arduino
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