The RPI-129BN is a reflective photosensor manufactured by Rohm Semiconductor. It integrates an infrared LED and a phototransistor in a single package. It detects the presence or absence of an object by measuring the amount of infrared light reflected back to the phototransistor.

Applications

• Object Detection: Detecting the presence or absence of objects in various applications.
• Line Following: Used in robotics for line following applications.
• Edge Detection: Detecting edges for counting or positioning purposes.
• Proximity Sensing: Sensing the proximity of an object.
• Automated Machinery: Used in automated machinery for position sensing and control.
• Gaming Devices: Employed in gaming devices for motion and object detection.

Features

• Reflective Photosensor: Detects reflected infrared light.
• Integrated IR LED and Phototransistor: Contains both the light source and detector.
• Compact Package: Small size for easy integration.
• High Sensitivity: Detects small changes in reflected light.
• Fast Response Time: Provides quick and accurate object detection.
• RoHS Compliant: Compliant with Restriction of Hazardous Substances directive.

Benefits

• Simple Object Detection: Provides a simple and reliable way to detect objects.
• Easy to Use: Easy to integrate into existing circuits and systems.
• Compact Design: Small size allows for use in space-constrained applications.
• Accurate Sensing: Provides accurate and reliable object detection.
• Cost Effective: Offers a cost-effective solution for object detection.

Additional Details

The RPI-129BN operates at a typical wavelength of 940nm. The phototransistor's collector current increases when infrared light is reflected back onto it. The output signal can be easily processed by a microcontroller or other electronic circuit. The typical operating voltage is around 5V. The sensing distance depends on the reflectivity of the object being detected. This sensor is commonly used in robotics, automation, and other applications requiring reliable object detection. The package is typically a leaded through-hole type, making it easy to prototype and experiment with.