4-CH IR Line sensor Module
4-Channel IR Line Sensor Module
Line Tracking Obstacle Detection Multi-Sensor Array
What is a 4-CH IR Line Sensor?
The 4-channel IR line sensor module is a reflective infrared sensor array that contains:
4 IR transmitter (LED) + receiver (phototransistor) pairs
Arranged in a row for multi-point detection
It detects:
Black/white lines
Edges
Obstacles
Commonly used in robotics for line-following and navigation
Working Principle
Each channel works like this:
IR LED emits infrared light
Light hits a surface
Reflected light is received
Output changes based on reflection
Behavior:
utput)
Black surface low reflection no detection (HIGH output)
All 4 sensors work independently for better accuracy
Internal Components
4 IR emitter-receiver pairs
LM393 / LM339 comparator IC
4 potentiometers (sensitivity control)
Indicator LEDs for each channel
Pin Configuration
Typical 6-pin interface:
VCC 3.3V 5V
GND Ground
OUT1 Sensor 1 output
OUT2 Sensor 2 output
OUT3 Sensor 3 output
OUT4 Sensor 4 output
Output Behavior
Digital output (object/line detected
HIGH no detection
Can be directly connected to microcontrollers (Arduino, ESP32, etc.)
Technical Specifications
Operating Voltage: 3.3V 5V DC
Detection Range: ~1 mm to 60 cm (adjustable)
Output Type: Digital (HIGH/LOW)
Number of Channels: 4
IR Wavelength: ~950 nm
Response Time: < 2 ms
Interface: 6-wire
Key Features
4 independent sensing channels
Adjustable sensitivity (via potentiometers)
Real-time detection with LED indicators
Compact and easy to mount
Works in moderate ambient light
(lower robots
Maze-solving robots
Edge/cliff detection
Obstacle avoidance systems
Industrial automation (object counting)
Advantages
Multi-point detection (better accuracy than single sensor)
Easy interfacing with microcontrollers
Adjustable sensitivity
Fast response
Limitations
Performance affected by surface color and lighting
Needs calibration for best accuracy
Short effective distance for line tracking
May give false readings in strong sunlight
Important Notes
Best performance at close distance (210 mm for line tracking)
Adjust potentiometers for each sensor
Keep sensor aligned parallel to surface
Use multiple set
Summary
The 4-CH IR Line Sensor Module is a multi-sensor array that:
Detects lines and objects using infrared reflection Provides 4 digital outputs Improves accuracy in robotics navigation
Ideal for:
Line follower robots
Smart automation projects
Embedded