如何去实现一种基于Arduino nano的6路循迹小车设计

#define leftA_PIN 7#define leftB_PIN 6#define left_Pwm_PIN 5#define STBY 8#define rightA_PIN 9#define rightB_PIN 10#define right_Pwm_PIN 11                   #define leftA_track_PIN 2#define leftB_track_PIN 3#define middle_track_PIN 4#define .