This is a simple example of how to use the Hobby Components line hunting sensor module (HCARDU0005). It is a very simple module that requires only one DIO pin (defined as an input) to operate. When the sensor detects a reflective object in close proximity it will pull a DIO pin that it has been connected to LOW. A non reflective or no object in close proximity will cause the DIO pin to go high.
3 VCC (+5V)
/* FILE: ARD_Line_Hunting_Sensor_HCARDU0005_Example
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/* Define the DIO pin that will be used to communicate with the sensor */
#define LINEHUNTSENS_DIO 2
/* Initialise serial and DIO */
/* Setup the serial port for displaying the status of the sensor */
/* Configure the DIO pin the sensor will be connected to as an input */
/* Main program loop */
/* If the DIO pin is pulled low then an object has been detected */
Serial.println("Object detected !");