KY-010 Broken Light Blocking Photo Interrupter Sensor Module AVR PIC DIY Starter Kit Photo interrupter module and a digital interface, built-in 13 LED build a simple circuit to produce.photo-interrupter warning lamp It comes with digital interfaces of the LED, the light blocking access number 3 sensor interfaces,sensing when the light interrupter Device senses a key signal, LED lights, otherwise off.
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Pack of one KY-010 Broken Light Blocking Photo Interrupter Sensor Module For Ardui AVR PIC DIY Starter