ALLNET 4duino Light Barrier Infrared Diffuse Reflective Sensor Module (4duino_B18)

The ALLNET 4duino Light Barrier is an infrared diffuse-reflective photoelectric sensor module engineered for non-contact object detection in microcontroller projects. Its standout capability is adjustable detection from 1 cm to 30 cm, making it a versatile choice for automation, robotics, and interactive installations.

Advantages

Onboard sensitivity adjustment via potentiometer allows fine-tuning for different surfaces and distances. The module provides a clean digital output (TTL level) that connects directly to Arduino, Raspberry Pi, or any 3.3V–5V logic system. Two indicator LEDs give instant visual feedback: red for power, green for detection status. The LM393 comparator ensures stable switching and fast response under 10 ms. Compact design with two M3 mounting holes simplifies integration into enclosures or robot frames.

Suitable for

• Object detection and presence sensing in automation lines
• Line tracking and edge detection in mobile robots
• Obstacle avoidance for small autonomous vehicles
• Pulse counting and speed measurement on rotating parts
• Interactive art installations and educational STEM projects

Key specifications

• Sensor type: Infrared (IR) photoelectric sensor, diffuse-reflective
• Operating voltage: 3.3V – 5V DC
• Output: Digital (TTL level)
• Detection range: 1 cm – 30 cm (adjustable)
• Comparator chip: LM393
• Current consumption: < 20 mA
• Response time: < 10 ms
• Interface: 3-pin header (VCC, GND, OUT)
• Mounting holes: 2x M3
• Compatibility: Arduino, Raspberry Pi, microcontrollers

Recommendations

For best results, mount the sensor with a clear line of sight to the target and adjust the potentiometer until the green LED reliably toggles. Use a stable 5V supply when driving multiple sensors to avoid voltage drops.