ADC0808实现数字电压表源码与仿真

/* 利用ADC0809(ADC0808)巡回采集两路电压值（0~5V），采样周期为0.1S.设计电路图并编写相应程序实现。 */ #include<reg51.h> #include<absacc.h> #define PIN0 XBYTE[0X7FF8] float result=0,result_reg; unsigned char code tab[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f}; void delay(unsigned int i) { unsigned int j=0; while (j<i) j++; } void panduan() { unsigned char i; PIN0=0xFF; for(i=0;i<0x9f;i++); result_reg=PIN0; result=result_reg*5/255; } void display(int a,b,c) { P1=0x00; P2=0xf4; P1=tab[c]; delay(100); P1=0x00; P2=0xf2; P1=tab[b]; delay(100); P1=0x00; P2=0xf1; P1=tab[a]+0x80; delay(100); P1=0x00; P2=0xf8; P1=0x3e; } void main(void) { int a,b,c,r; while(1) { panduan(); r=result*100; a=r/100; b=(r-a*100)/10; c=(r-a*100)%10; display(a,b,c); } }