# KS0453 Keyestudio 3-channel Line Tracking Module

![](media/image-20260121143036752.png)

## 1. Description

In the smart car DIY process, we often use a line tracking sensor to make the smart car follow a line.

The keyestudio 3-channel line tracking module actually is an infrared sensor. The component used is a TCRT5000 infrared tube.

The working principle is to use the different reflectivity of infrared light to color, converting the strength of the reflected signal into a current signal.

During the detection, black is active at HIGH level, and white is active at LOW. The detection height is 0-3 cm.

We have integrated three groups of TCRT5000 infrared tubes on a single board, convenient for wiring and control.

Turn the adjustable trimpot to adjust the module’s sensitivity. The module comes with two 3mm positioning holes for mounting on other devices.

Note: before testing, turn the potentiometer to adjust the sensitivity. The sensitivity is the best when make the LED at the threshold point between ON and OFF.

## 2. Technical Parameters

- Operating voltage: DC 3.3-5V
- Detection height: 0—3cm
- Interface: 5pin of 2.54mm pitch
- Positioning hole diameter: 3mm
- Dimensions: 42mm * 31mm * 7mm
- Weight: 6.6g
- Environment attribute: ROHS

## 3. Wiring Diagram

![](media/image-20260121143306633.png)

## 4. Test Code

Download code : [Code](./Code.7z)

```c
int sensor1 = 2;
int sensor2 = 3; 
int sensor3 = 4; 
int val1; 
int val2; 
int val3; 

void setup() 
{
  Serial.begin(9600);
  pinMode(sensor1, INPUT); // set sensor to input mode
  pinMode(sensor2, INPUT); // set sensor to input mode
  pinMode(sensor2, INPUT); // set sensor to input mode
}

void loop() 
{
  val1=digitalRead(sensor1);
  Serial.print("val1:");
  Serial.print(val1);
  val2=digitalRead(sensor2);
  Serial.print("  val2:");
  Serial.print(val2);
  val3=digitalRead(sensor3);
  Serial.print("  val3:");
  Serial.println(val3);
  delay(200);
}
```

## 5. Test Result

Done uploading the code to control board, open the serial monitor and set the baud rate to 9600.

When the tacking module detects black line, output 1; detecting white line, output 0. As figure shown below.

![](media/image-20260121143402960.png)