用汇编开发的，自动往返小车程序，用红外探头检测轨道，在规定的第二个黑色轨道上加速，然后再下个轨道上减速，再检测轨道，返回原地。-Developed in assembly, automatic round-trip car program, with the infrared sensor detects the track, the track provided on the second black to accelerate, then slow down the next track,