An opto-interrupter is like a tiny trip line, when something solid passes between the emitter and the receiver it is detectable as a change in the digital output. These are great for making very low cost rotary encoders and optical end stops.
To use this sensor simply connect the LED Anode to 5VDC and the Cathode to ground through a ~180 Ohm resistor. On the receiver side connect the Collector to 5VDC and the Emitter to a ~1K Ohm resistor (going to ground) as well as your Arduino or other microcontroller digital input.
BC Robotics Inc. is a supplier and manufacturer of electronic kits, components, and accessories based in Nanaimo BC, Canada. We stock a large selection of popular items from Arduino, BBC micro:bit, Raspberry Pi, Adafruit Industries, SparkFun Electronics, Pololu, Makey Makey, and many more!
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