The TCRT5000 3 Channel Line Tracker Sensor Module is widely used in robotics and automation projects for detecting lines and distinguishing between black and white surfaces. It uses infrared (IR) reflective sensors to measure the amount of reflected light from a surface.
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| TCRT5000 3-channel line tracker sensor module used with Arduino Uno. |
In this project, we will interface a TCRT5000 3-channel module with an Arduino Uno and observe how the sensor responds to black and white surfaces using the Arduino Serial Monitor.
What is the TCRT5000 Line Tracker Sensor?
The TCRT5000 is an infrared reflective sensor consisting of an IR LED transmitter and a phototransistor receiver. When infrared light is emitted, the amount of reflected light depends on the surface color.
- White surfaces reflect more infrared light.
- Black surfaces absorb more infrared light.
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| Line detection principle based on reflected infrared light. |
This principle allows the sensor to detect lines and is commonly used in line-following robots.
Components Required
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| Components needed for the TCRT5000 Arduino project. |
- Arduino Uno
- TCRT5000 3 Channel Line Tracker Module
- Dupont Jumper Wires
- USB Cable
- Cardboard
- Black Electrical Tape
Wiring Connections
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| Wiring diagram between the TCRT5000 module and Arduino Uno. |
- VCC → 5V
- GND → GND
- L → A0
- C → A1
- R → A2
Arduino Code
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| Arduino sketch for reading three TCRT5000 sensor channels. |
int L = A0;
int C = A1;
int R = A2;
void setup() {
Serial.begin(9600);
}
void loop() {
int valL = analogRead(L);
int valC = analogRead(C);
int valR = analogRead(R);
Serial.print("L: ");
Serial.print(valL);
Serial.print(" C: ");
Serial.print(valC);
Serial.print(" R: ");
Serial.println(valR);
delay(300);
}
How the Code Works
The program continuously reads the analog values from the three sensor channels.
- Left sensor connected to A0
- Center sensor connected to A1
- Right sensor connected to A2
The sensor readings are displayed in the Arduino Serial Monitor every 300 milliseconds.
Sensor Testing
To test the module:
- Place the sensor above a white cardboard surface.
- Observe the indicator LEDs on the module.
- Move the sensor above the black tape line.
- Compare the readings shown on the Serial Monitor.
White Surface
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| Sensor positioned above a white reflective surface. |
- The infrared light is strongly reflected.
- Indicator LEDs turn ON.
- Higher sensor readings are observed.
Black Surface
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| Sensor positioned above a black non-reflective surface. |
When the sensor is positioned above the black tape:
- Less infrared light is reflected.
- Indicator LEDs turn OFF.
- Sensor readings change significantly.
This difference allows robots to detect and follow a black line on a white background.
Adjusting Sensor Sensitivity
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| Sensitivity adjustment using the onboard potentiometer. |
- Turn clockwise to increase sensitivity.
- Turn counterclockwise to decrease sensitivity.
Adjust the potentiometer until the sensor can clearly distinguish between the black tape and white cardboard.
Applications
- Line Following Robots
- Automated Guided Vehicles (AGV)
- Obstacle Detection Systems
- Surface Color Detection
- Industrial Automation Projects
- Educational Robotics Projects
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Conclusion
This project demonstrates the basic operation of the sensor and provides a foundation for building line-following robots and automation systems.