[Denz]

Declaired in tracking.h


// The distance from the robot to the wall. Initial value is not actually zero; calculated when camera is turned on.
#define distance_from_wall 0


and also prototyped the Distance_Function in tracking.h

// function prototypes
void Servo_Track(void);
void Initialize_Tracking(void);
unsigned char Get_Tracking_Configuration(unsigned int, unsigned char);
int Distance_Function(float);