在前面板中放置3个LED灯，当程序运行后第1个LED打开并保持3秒，然后关闭，同时打开第2个LED并保持5秒后关闭，同时打开第1个和第3个LED保持5秒后，程序停止。-Place the three front panel LED lights, when the program runs the first one LED open and hold for 3 seconds, then turn off, while the first two LED open and hold for 5 seconds after the close, and open the first one and three LED Hold for 5 seconds, the program stops.