1 #ifndef SENSOR_H
 2 
 3 
 4 #define  SPOT_OCCUPIED  0x01
 5 #define  SPOT_FREE      0x02
 6 #define  CAR_ENTER      0x04
 7 #define  CAR_EXIT       0x08
 8 
 9 
10 #endif /* #ifndef SENSOR_H */
11