### Project 17 Line Tracking Sensor

**1. Introduction**

This Line Tracking Sensor can detect white lines in black and black lines in white. The single line-tracking signal provides a stable output signal TTL for a more accurate and more stable line.

Multi-channel option can be easily achieved by installing required line-tracking robot sensors.

![](media/image-20251121141557178.png)

**2. Specification**

- Power supply: +5V
- Operating current: <10mA
- Operating temperature range: 0°C ~ + 50°C
- Output interface: 3-PIN (1 - signal ; 2 - power ; 3 - power supply negative)
- Output Level: TTL level

**3. Connection Diagram**

![](media/image-20251121104141264.png)

**4. Sample Code**

```c
void setup()
{
  Serial.begin(9600);
}

void loop()
{
  Serial.println(digitalRead(3)); // print the data from the sensor
  delay(500);
}
```

**5. Result**

Done uploading the code to board, open the serial monitor and set the baud rate as 9600, then you can see the data from the sensor. Shown below.

![](media/5.png)