STC89C52RC based pneumatic control program, the system has a plurality of ultrasonic ranging subroutine, pwm, pid, matrix keyboard.

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....\键盘反转扫描测试
....\................\chaoshengboceju.c
....\................\chaoshengboceju.h
....\................\chaoshengboceju.LST
....\................\chaoshengboceju.OBJ
....\................\demo
....\................\demo.hex
....\................\demo.lnp
....\................\demo.M51
....\................\demo.Opt
....\................\demo.plg
....\................\demo.Uv2
....\................\demo_Opt.Bak
....\................\demo_Uv2.Bak
....\................\key.c
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....\................\lcd12864.c
....\................\lcd12864.h
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....\................\main.c
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....\................\pid.c
....\................\pid.h
....\................\pid.LST
....\................\pid.OBJ

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