This program is 51 microcontroller I/O port output Didi tick intermittent sound and light alarm signal test, microcontroller tutorial: http://www.ipbb.cn, thank you!

第19课，嘀嘀嘀间断声光报警信号试验
..................................\lesson
..................................\lesson.M51
..................................\lesson.Opt
..................................\lesson.Uv2
..................................\lesson.hex
..................................\lesson.lnp
..................................\lesson.plg
..................................\main.LST
..................................\main.OBJ
..................................\main.c
..................................\第19课，嘀嘀嘀间断声光报警信号试验.pdf

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