1/2/5PCS Slot Type IR Optocoupler Speed Sensor Module 3.3V-5V LM393 for Arduino
ab 1,12 €
Arduino Module. Module DO connected to the relay, composed of the limit switch functions can also be connected to the active buzzer module, composed of the alarm. Module slot unobstructed, receiver tube conduction module DO output low, shelter, DO output high.
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