Adafruit Reflective Ir Sensor With 470 And 10K Resistors

Black & dark colored stuff isn't detected Simple plastic casing with IR LED and an IR phototransistor Handy when you want to detect if something has passed by the sensor Works best for detecting a light-colored object approximately 5mm away Comes with a 470 ohm resistor (for biasing the IR LED) and a 10K resistor