單片機ADC0809數(shù)字萬用表程序+仿真顯示電壓值，過壓報警

[復制鏈接]

電梯直達

樓主

ID:413568 發(fā)表于 2018-12-13 15:05 | 只看該作者 |只看大圖回帖獎勵

|倒序瀏覽 |閱讀模式

數(shù)字萬用表仿真原理圖如下（proteus仿真工程文件可到本帖附件中下載）

注意OUT1~OUT8，最高位是OUT1，最低位是OUT8

單片機源程序如下:

#include <reg52.h>
#define uchar unsigned char
#define uint unsigned int
//===========================
//ADC0809相關引腳定義
//===========================
#define ADC_DATA P1
sbit ADC_EOC = P3^3;
sbit ADC_CLK = P3^4;
sbit ADC_START = P3^6;
sbit ADC_OE = P3^7;
//===========================
//4位共陽數(shù)碼管相關
//===========================
uchar code seg[10]={ 0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90 }; //0~9 小數(shù)點不亮
uchar code seg_dot[10]={ 0x40,0x79,0x24,0x30,0x19,0x12,0x02,0x78,0x00,0x10 }; //0~9 小數(shù)點亮
#define SEG_DATA P2 //數(shù)碼管段選碼，共陽數(shù)碼管，低電平選通段選碼
sbit SEG_SEL_0 = P0^3; //數(shù)碼管位選：第0位，共陽數(shù)碼管，高電平選通位選碼
sbit SEG_SEL_1 = P0^2; //數(shù)碼管位選：第1位
sbit SEG_SEL_2 = P0^1; //數(shù)碼管位選：第2位
sbit SEG_SEL_3 = P0^0; //數(shù)碼管位選：第3位
//===========================
//警報：LED與蜂鳴器引腳
//===========================
sbit LED = P0^5; //低電平亮
sbit BEEP = P0^4; //高電平響
#define LED_ON LED=0
#define LED_OFF LED=1
#define BEEP_ON BEEP=1
#define BEEP_OFF BEEP = 0
//===========================
//粗略延時函數(shù) AT89C51 & 12MHz
//===========================
void delayms(unsigned int ms)
{
unsigned char a,b,c;
while(ms--)
{
for(c=1;c>0;c--)
for(b=142;b>0;b--)
for(a=2;a>0;a--);
}
}
/*
//===========================
//粗略延時函數(shù) STC12C5A60S2 & 12MHz
//===========================
void delayms(unsigned int ms)
{
unsigned char a,b,c;
while(ms--)
{
for(c=1;c>0;c--)
for(b=222;b>0;b--)
for(a=12;a>0;a--);
}
}
*/
//===========================
//定時器初始化，配置ADC0809時鐘
//===========================
void timer_init(void)
{
//配置定時器0
ET0 = 1;
TMOD &= 0xF0;
TMOD |= 0x02; //定時器0，模式2，自動重裝定時器
TH0 = 200; //自動重裝值
TL0 = 200;
TR0 = 1;
//配置定時器1
ET1 = 1;
TMOD &= 0x0F; //清除定時器1配置，不改動定時器0的配置
TMOD |= 0x10; //定時器1模式一，不改動定時器0的模式
TH1 = (65536 - 2000)/256;
TL1 = (65536 - 2000)%256;
TR1 = 1;
EA = 1;
}
//===========================
//定時器0中斷，為ADC0809提供時鐘信號
//===========================
void timer0() interrupt 1
{
ADC_CLK = ~ADC_CLK;
}
//============================
//ADC0809 轉換函數(shù)
//============================
uchar ADC0809_GET(void)
{
ADC_START = 0;
ADC_OE = 0;
ADC_START = 1;
ADC_START = 0;
while(ADC_EOC == 0);
ADC_OE = 1;
return ADC_DATA;
}
//============================
//定時器1中斷函數(shù)，用于刷新數(shù)碼管
//============================
uchar t1_flag = 0; //用于標記顯示第幾位數(shù)碼管
uchar seg0 = 0; //第0位數(shù)碼管的值
uchar seg1 = 1; //第1位數(shù)碼管的值
uchar seg2 = 2; //第2位數(shù)碼管的值
uchar seg3 = 3; //第3位數(shù)碼管的值
void timer1() interrupt 3
{
TH1 = (65536 - 2000)/256;
TL1 = (65536 - 2000)%256;
SEG_SEL_0 = 0;
SEG_SEL_1 = 0;
SEG_SEL_2 = 0;
SEG_SEL_3 = 0;
SEG_DATA = 0xff;
if(t1_flag == 0)
{
SEG_SEL_0 = 1; //選通第0位數(shù)碼管
SEG_SEL_1 = 0;
SEG_SEL_2 = 0;
SEG_SEL_3 = 0;
SEG_DATA = seg_dot[seg0]; //顯示帶小數(shù)點的數(shù)
}
else if(t1_flag == 1)
{
SEG_DATA = seg[seg1];
SEG_SEL_0 = 0;
SEG_SEL_1 = 1; //選通第1位數(shù)碼管
SEG_SEL_2 = 0;
SEG_SEL_3 = 0;
}
else if(t1_flag == 2)
{
SEG_DATA = seg[seg2];
SEG_SEL_0 = 0;
SEG_SEL_1 = 0;
SEG_SEL_2 = 1; //選通第2位數(shù)碼管
SEG_SEL_3 = 0;
}
else if(t1_flag == 3)
{
SEG_DATA = seg[seg3];
SEG_SEL_0 = 0;
SEG_SEL_1 = 0;
SEG_SEL_2 = 0;
SEG_SEL_3 = 1; //選通第3位數(shù)碼管
}
t1_flag++; //自加1
t1_flag = t1_flag%4; //讓t1_flag 在0和3之間循環(huán)
}
//============================
//顯示電壓值，輸入0~255，顯示0.000~5.000
//============================
uint print_volt(uchar num)
{
uint volt = 0;
volt = num/255.0 * 5000 + 0.5; //除255.0和除255有很大區(qū)別，除255.0會自動轉換為float型，小數(shù)才能保持，而volt/255=0，+0.5四舍五入。
seg0 = volt/1000%10;
seg1 = volt/100%10;
seg2 = volt/10%10;
seg3 = volt%10;
return volt;
}
//============================
//主函數(shù)
//============================
void main(void)
{
uchar adc_num = 0; //ADC采集到的值
……………………
…………限于本文篇幅余下代碼請從51黑下載附件…………