求大神幫我看看為啥調(diào)節(jié)滑阻，電壓值不變呢

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#include<reg52.h> #include<intrins.h> #include"LCD.h" sbit AD_EOC=P3^0; sbit AD_START=P3^3; sbit AD_OE=P3^4; sbit s1=P2^3; sbit s2=P2^4; sbit s3=P2^5; #define _300v_on {s1=1;s2=0;s3= ...