ADC0808数模转换电路

#include <reg51.H> #include "intrins.h" #define uint unsigned int #define uchar unsigned char sbit OE =P1^7; sbit EOC =P1^6; sbit ST =P1^5; sbit CLK =P1^4; unsigned char dispbitcode[8]={0xf7,0xfb,0xfd,0xfe,0xef,0xdf,0xbf,0x7f}; //位扫描 unsigned char dispcode[16]={0x3f,0x06,0x5b,0x4f, 0x66,0x6d,0x7d,0x07, 0x7f,0x6f,0x77,0x7c, 0x39,0x5e,0x79,0x71}; //字段码 共阴 unsigned char dispbuf[4]; uchar getdata; //获取从ADC转换回来的值 void Init_Timer0(void) { EA=1; TMOD=0x02; TH0=0XF6; TL0=0XF6; ET0=1; TR0=1; } void Timer0_isr(void) interrupt 1 using 1 { TH0=0x0f; TL0=0x00; CLK=!CLK; } void delay_1ms(void) //12mhz delay 1.01ms { unsigned char x,y; x=3; while(x--) { y=40; while(y--); } } void AD(void) //AD转换 { ST=0; ST=1; ST=0; while(EOC==0); OE=1; getdata=P2; OE=0; } void convert(void) //数据转换 { uint temp; temp=getdata*1.0/255*500; dispbuf[3]=temp/1000; dispbuf[2]=(temp%1000)/100; dispbuf[1]=((temp%1000)%100)/10; dispbuf[0]=((temp%1000)%100)%10; } void display(void) //显示 { char k; for(k=0;k<4;k++) { P3 = dispbitcode[k]; P0 = dispcode[dispbuf[k]]; if(k==2) //小数点dp P0|=0x80; delay_1ms(); } } void main(void) { Init_Timer0(); while(1) { AD(); convert(); display(); } }