The TCRT5000 IR Infrared Reflective Sensor Module is an essential component for short-range object detection and surface sensing. At Electrapac, we highly recommend this module for students and hobbyists in Bangladesh who are building line-following robots, optical encoders, or non-contact limit switches with Arduino and Raspberry Pi.

The module combines an infrared (IR) emitting diode and an NPN phototransistor in a single package. It works by emitting an invisible beam of infrared light; if an object is in front of the sensor, the light reflects back to the phototransistor, triggering a signal. Because different colors reflect IR light differently (black absorbs it while white reflects it), this sensor is the industry standard for Line Following Robots.

Key Features for Electrapac Customers

• Dual Signal Output: * Digital (D0): Provides a simple HIGH or LOW signal based on a preset threshold—perfect for fast-moving line followers.

  • Analog (A0): Provides a variable voltage based on the distance or reflectivity of the object, allowing for more nuanced sensing.

• On-Board Potentiometer: Allows you to manually adjust the sensitivity and detection range to suit your specific project environment.

• Anti-Interference Design: The physical casing of the TCRT5000 sensor helps block ambient visible light, ensuring the sensor only responds to its own infrared frequency.

• Status LEDs: Features a power indicator and a signal indicator LED that lights up when an object is detected, making calibration a breeze.

• Compact & Lightweight: Easily mounts to the bottom of robot chassis or inside small enclosures using the pre-drilled M3 mounting hole.

Setting up the Electrapac TCRT5000 module is straightforward for any DIY enthusiast:

1. VCC: Connect to 3.3V or 5V.

2. GND: Connect to Ground.

3. D0 / A0: Connect to your desired microcontroller pins.

4. Calibration: Place the sensor over a white surface. Rotate the potentiometer until the "Signal LED" turns on. Then, move it over a black surface; the LED should turn off. If it doesn't, fine-tune the potentiometer until you get a clear distinction.

Pro-Tip: When building a Line Follower, place the sensor roughly 5mm to 10mm above the track. If the sensor is too high, the IR light will scatter; if it is too low, it may "blind" the phototransistor with too much reflection.

• Line Following Robots: Detecting black lines on white surfaces (or vice versa) for autonomous navigation.

• Optical Encoders: Counting the rotations of a wheel by detecting a black stripe on a motor shaft.

• Paper Sensing: Detecting the presence of paper in DIY printers or automated feeders.

• Limit Switches: Using a non-contact method to tell a CNC machine or 3D printer it has reached its home position.

• Water Meter Pulse Counting: Detecting the rotation of reflective dials in utility meters.

We source our TCRT5000 Modules with genuine LM393 comparators to ensure a stable digital signal even in electrically noisy environments. Visit us at www.electrapac.com for the sensing components that help your robots find their way.