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希望對51黑電子論壇的朋友有幫助，精度還可以，能滿足一般需求，AD芯片用的是便宜的adc0809，如果能用好一點的比如MAX197，精度可以更高！
單片機數字萬用表仿真原理圖：
數字萬用表的單片機源碼：
- #include <AT89X52.H>
- unsigned char code dispbitcode[]={0xfe,0xfd,0xfb,0xf7, 0xef,0xdf,0xbf,0x7f};
- unsigned char code dispcode[]={0x3f,0x06,0x5b,0x4f,0x66, 0x6d,0x7d,0x07,0x7f,0x6f,0x00};
- unsigned char dispbuf[8]={10,10,10,10,10,0,0,0};
- unsigned char dispcount;
- unsigned char getdata;
- unsigned int temp;
- long int i;
- unsigned int R1;
- sbit ST=P3^0;
- sbit OE=P3^1;
- sbit EOC=P3^2;
- sbit CLK=P3^3;
-
- void main(void)
- {
- ST=0;
- OE=0;
- ET0=1;
- ET1=1;
- EA=1;
- TMOD=0x12;
- TH0=216;
- TL0=216;
- TH1=(65536-5000)/256;
- TL1=(65536-5000)%256;
- TR1=1;
- TR0=1;
- ST=1;
- ST=0;
- while(1)
- {
- if(EOC==1)
- {
- OE=1;
- getdata=P0;
- OE=0;
- i=getdata*196;
- dispbuf[5]=i/10000;
- i=i%10000;
- dispbuf[6]=i/1000;
- i=i%1000;
- dispbuf[7]=i/100;
- ST=1;
- ST=0;
- }
- }
- }
-
- void t0(void) interrupt 1 using 0 //定時器0 中斷服務
- {
- CLK=~CLK;
- }
-
- void t1(void) interrupt 3 using 0 //定時器1 中斷服務
- {
- TH1=(65536-6000)/256;
- TL1=(65536-6000)%256;
- P2=0xff;
- P1=dispcode[dispbuf[dispcount]];
- P2=dispbitcode[dispcount];
- if(dispcount==5)
- {
- P1=P1 | 0x80;
- }
- dispcount++;
- if(dispcount==8)
- {
- dispcount=0;
- }
- }
下載：
數字萬用表.zip
(139.9 KB, 下載次數: 141)
2017-3-7 03:04 上傳
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