The TCRT5000 IR Sensor Module with LM393 Comparator is a reflective infrared sensor designed for short-range object detection and line tracking applications. It integrates the reliable TCRT5000L reflective sensor and an LM393 voltage comparator chip to provide a stable and accurate digital output. Ideal for use in robotics, automation systems, and proximity-based detection projects, this module is compact, efficient, and highly customizable via an onboard sensitivity adjustment potentiometer.

Features:

• Operating voltage range: 3.5V to 5V DC

• Low current consumption: approximately 15mA

• Built-in TCRT5000L reflective infrared sensor

• Equipped with LM393 dual voltage comparator chip

• Adjustable sensitivity using onboard potentiometer

• Digital output signal for easy interfacing with microcontrollers

• Integrated detection status LED for real-time feedback

• Optimal detection range: 3 mm to 30 mm depending on surface reflectivity

Technical Highlights:

• Sensor type: Infrared reflective (TCRT5000L)

• Output type: Digital (HIGH or LOW depending on obstacle presence)

• Output goes LOW when an object is detected (logic may vary based on version)

• Onboard potentiometer allows fine-tuning of detection sensitivity

• Signal processing handled by LM393 comparator for stable output

Pin Configuration:

• VCC: Power supply input (3.5V to 5V)

• GND: Ground

• DO: Digital Output (connects to microcontroller GPIO)

Working Principle:

The TCRT5000 sensor emits infrared light that reflects off nearby objects. When a surface is within the detection range, the reflected light is captured by the phototransistor inside the sensor. The LM393 comparator processes this signal and sends a digital output to indicate the presence or absence of an obstacle. The module also lights up the onboard LED when an object is detected.

Applications:

• Line-following robots

• Obstacle-avoiding robotic systems

• Proximity-based triggering mechanisms

• Industrial automation for object detection or alignment

• DIY electronics and Arduino-based projects

• Anti-collision detection in smart cars or toys

Advantages:

• Simple to use with digital signal output

• Adjustable detection range via potentiometer

• Works reliably in varying lighting conditions (within limits)

• Compatible with Arduino, Raspberry Pi, and other development boards

• Compact and durable design for embedded or mobile use

Important Notes:

• Best results occur with reflective, light-colored surfaces

• Avoid pointing directly at sunlight or bright ambient light

• Mount securely to prevent changes in sensor angle or distance

• Ensure correct polarity and supply voltage to avoid damage

Datasheet and Resources:

• TCRT5000 Official Datasheet (Vishay)

• TCRT5000 Arduino Tutorial (Instructables)