说明：  自己做的蓝牙小车，stc89c52单片机，在手机端用串口调试软件，发送1开启循迹模式，发送3开启蓝牙控制模式，2546对应前后左右，亲测可用！
(Bluetooth Car, do STC89C52 microcontroller, using serial debugging software in the mobile phone terminal, sending 1 open tracking mode, sending 3 open Bluetooth control mode, 2546 corresponding sides of the pro!)