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.

Technical Specification:

• Weight: 1g
• Size: 15mm x 18mm x 5mm / (0.6" x 0.7" x 0.2")
• Best working range: 2mm to 10mm

Features:

• Reflective IR sensor
• Breadboard friendly sensor
• Easy to handle
• Highly sensitive and reliable
• Easy to solder

Pin Description:

• Pin 1 and 2 are connected to LED
• Pin 3 and 4 are connected to the phototransistor.

Applications:

• Assembly line automation
• Machine automation
•  Machine safety
•  End of travel sensor
•  Door sensor
•  Thermal Paper Mark