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The TCRT5000 IR Reflective Line Tracking Sensor Module is an essential optical detection module engineered for autonomous robotics and precision positioning applications. The board houses a TCRT5000 sensor head consisting of a $950\text{nm}$ infrared emitting diode and an NPN phototransistor encased in a compact plastic enclosure that blocks ambient visible light.

When the module passes over a reflective surface (such as white paper), emitted infrared light bounces back into the phototransistor, pulling the sensor output high. Conversely, when passing over a light-absorbing non-reflective surface (such as a black electrical tape line), the IR beam is absorbed, lowering phototransistor conductivity. The onboard LM393 comparator IC compares this signal against a user-adjusted threshold set via a precision potentiometer, triggering a clean $HIGH/LOW$ digital signal on the DO pin.

Key Features and Benefits

• Dual Signal Output Pins (Digital & Analog): Provides both a Digital Output ($DO$) for simple high/low binary detection and an Analog Output ($AO$) for fine-grained reflectivity measurement.

• Integrated LM393 Comparator IC: Ensures sharp signal switching with clean square-wave digital output capability ($>15\text{mA}$ drive current).

• Onboard Sensitivity Trimmer: Built-in multi-turn potentiometer allows easy threshold adjustments for various surface colors and ambient light conditions.

• Broad $3.3\text{V}-5\text{V}$ Compatibility: Interfaces directly with Arduino, ESP32, STM32, Raspberry Pi Pico, and 8051 microcontrollers.

• Dual LED Indicators: Power LED indicates active board power; Signal Output LED illuminates when the sensor detects a reflective surface/line trigger.

Technical Specifications

Wiring & Pinout Guide

1. Pin Description:

2. Typical Digital Line Detection Logic:

• White Surface (Reflective): $DO$ output stays LOW ($0\text{V}$) $\to$ Onboard Signal LED turns ON

• Black Line (Non-Reflective): $DO$ output stays HIGH ($5\text{V}/3.3\text{V}$) $\to$ Onboard Signal LED turns OFF

CALIBRATION TIP: Position the sensor approximately $2\text{mm}-5\text{mm}$ above your track surface. Rotate the onboard blue potentiometer using a small screwdriver until the signal LED triggers cleanly when transitioning between the white surface and black tape line.

Applications

• Autonomous Line-Following Robots: Primary navigation sensor for 2WD/4WD smart cars following black or white track paths.

• Grid & Maze Navigation: Detecting line intersections and cross-sections in maze-solving algorithms.

• Rotary & Shaft Encoders: Counting wheel rotations when paired with a black-and-white slotted encoder disc.

• Paper & Material Detection: Detecting paper feed presence in fax machines, printers, and smart sorting mechanisms.

Package Includes

• 1 x TCRT5000 IR Reflective Line Tracking Sensor Module

Shipping & Delivery

• Free shipping on orders above ₹999 across India

• Dispatched within 1-3 business days

• Expected delivery: 3-7 business days depending on location

• Anti-static ESD protective packaging for safe transit