KY033 TCRT5000 Sensor
Overview
Single-channel infrared reflective sensor module
Based on TCRT5000 IR emitter + phototransistor
Used for line detection & object sensing
Compatible with Arduino, ESP32, Raspberry Pi
Working Principle
IR LED emits infrared light continuously
Surface reflects IR light back to phototransistor
Output depends on reflection:
Black surface LOW reflection HIGH output
White surface HIGH reflection LOW output
Comparator converts signal into digital output
Detects contrast between surfaces (black/white lines)
Key Specifications
atstrong>Current Consumption: ~20mA
Output Type: Digital (HIGH/LOW) + sometimes Analog
Detection Distance: ~1mm 8mm
Sensor Type: TCRT5000 reflective IR sensor
Comparator IC: LM393
Dimensions: ~4 1 cm
Pin Configuration
VCC 3.3V / 5V
GND Ground
OUT / S Digital signal output
3-pin simple interface
Module Components
TCRT5000 IR sensor
LM393 comparator
Sensitivity adjust potentiometer
Indicator LED
Mounting h
Fast response time
High reliability & stability
Compact and easy to mount
Strong anti-interference capability
Applications
Line follower robots
Edge detection systems
Obstacle detection
Encoder / position sensing
Object proximity sensing
Usage Tips
Keep sensor 25 mm above surface
Calibrate using potentiometer
Use black tape on white surface for best results
Avoid strong sunlight (IR interference)
Use stable power supply
Advantages
Very low cost
Simple to use (plug & play)
Fast detection
Widely used in robul
Works only on contrast surfaces
Affected by ambient IR (sunlight)
Short detection range
Needs calibration
Summary
A single-channel IR line tracking sensor
Uses TCRT5000 reflective technology
Outputs digital signal for line detection
Ideal for robotics, automation, and DIY projects
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