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ANMBEST Relay Module with Optocoupler High/Low Level Trigger for Arduino (3, 3V Relay 1 Channel): Amazon.com: Industrial & Scientific
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JANDECCN 10pcs Micro Limit Switch SPDT 1NO 1NC Snap Action Button Type for Arduino V-15-1C25: Amazon.com: Industrial & Scientific
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ANMBEST Relay Module with Optocoupler High/Low Level Trigger for Arduino (3, 3V Relay 1 Channel): Amazon.com: Industrial & Scientific
Electronics-Salon Arduino Screw Terminal Block Breakout Module, for Arduino UNO R3.: Amazon.com: Industrial & Scientific