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10 Pcs Motor Speed Sensor with L393 Chip, IR Infrared Optocoupler Module by 5mm Slotted Interrupter Sensor for Motor Speed and for Arduino Encoders: Amazon.com: Industrial & Scientific
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Geekstory 5PCS 2 Channel 5V Relay Module 10A with Optocoupler Low Level Trigger Expansion Board for Arduino R3 MEGA 2560 1280 DSP ARM PIC AVR DSP Electronic STM32 Raspberry Pi - - Amazon.com
