Adafruit Reflective Ir Sensor With 470 And 10K Resistors

Key Features

• Simple plastic casing with IR LED and an IR phototransistor
• Black & dark colored stuff isn't detected
• 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

This Reflective IR Sensor is a simple plastic casing with two elements - an IR LED and an IR phototransistor. You can control the IR LED and turn it on to bounce IR off objects to determine their reflectivity. White & light colored stuff will bounce the light, so you can detect it. Black & dark colored stuff will absorb the IR light so that it isn't detected. Likewise, if something isn't in the way of the sensor, it won't trigger either.

These sensors are handy when you want to detect if something has passed by the sensor, or a very simple hand-detector. Also sometimes these are used as rotary encoder, if the encoder wheel has black and white stripes, the photo sensor is fast enough to tell you the RPM.

Comes with a 470 ohm resistor (for biasing the IR LED) and a 10K resistor which you can use as a pull-up resistor for the phototransistor. The sensor is breadboard friendly and easy to solder to.

This works best when detecting a light-colored object approximately 5mm away - 2mm to 10mm worked fairly well but your results may vary with the LED brightness, object shininess, etc.

Item Specifics
Size: 15mm x 18mm x 5mm / 0.6" x 0.7" x 0.2"
Weight: 1g