// linebot1.nqc
//	turn by stopping one tread

// sensor and motors
#define EYE		SENSOR_2
#define LEFT	OUT_A
#define RIGHT	OUT_C

// thresholds
#define LEFT_THRESHOLD  	42
#define RIGHT_THRESHOLD		53

task main()
{
	SetSensor(EYE, SENSOR_LIGHT);
	On(LEFT+RIGHT);

	while(true)
	{
		if (EYE <= LEFT_THRESHOLD)
		{
			Off(LEFT);
			On(RIGHT);
		}
		else if (EYE >= RIGHT_THRESHOLD)
		{
			Off(RIGHT);
			On(LEFT);
		}
		else
		{
			On(LEFT+RIGHT);
		}
	}
}