基于電阻式應(yīng)變片的電子秤Proteus仿真+程序設(shè)計

ID:484734 · 發(fā)表于 2019-12-19 21:22

仿真原理圖如下（proteus仿真工程文件可到本帖附件中下載）

單片機(jī)源程序如下:

#include<reg52.h>
typedef unsigned char uint8;
typedef unsigned int uint16;
sbit rs=P2^6;
sbit rw=P2^5;
sbit e=P2^7;
sbit scl=P2^1;
sbit sda=P2^0;
uint8 num[]="0123456789";
uint8 d1[]="RMB/kg: ";
uint16 ad[5],m[5];
uint8 kn=10;
uint8 keynum[3];
uint16 pric=0;
void delay(uint16 i)
{
while(i--);
}
void wrc(uint8 c)
{
delay(1000);
rs=0;
rw=0;
e=0;
P0=c;
e=1;
delay(10);
e=0;
}
void wrd(uint8 dat)
{
delay(1000);
rs=1;
rw=0;
e=0;
P0=dat;
e=1;
delay(10);
e=0;
rs=0;
}
void init()
{
delay(1000);
wrc(0x38);
wrc(0x38);
wrc(0x38);
wrc(0x06);
wrc(0x0c);
wrc(0x01);
}
void iicinit()
{
sda=1;
scl=1;
}
void iicstart()
{
sda=1;
scl=1;
delay(10);
sda=0;
delay(10);
scl=0;
delay(10);
}
void iicstop()
{
sda=0;
scl=1;
delay(10);
sda=1;
delay(10);
sda=0;
delay(10);
}
void ack()
{
sda=1;
scl=0;
delay(2);
sda=0;
delay(2);
scl=1;
delay(10);
scl=0;
delay(2);
sda=1;
delay(5);
}
void noack()
{
sda=0;
scl=0;
delay(2);
sda=1;
delay(2);
scl=1;
delay(10);
scl=0;
delay(2);
sda=0;
delay(5);
}
void iicwrbyte(uint8 dat)
{
uint8 i;
scl=0;
for(i=0;i<8;i++)
{
if(dat&0x80)
{
sda=1;
}
else
{
sda=0;
}
dat<<=1;
scl=1;
delay(10);
scl=0;
delay(10);
}
sda=1;
delay(10);
}
uint8 iicread()
{
uint8 i,dat;
scl=0;
sda=1;
for(i=0;i<8;i++)
{
dat<<=1;
if(sda==1)
{
dat|=0x01;
}
scl=1;
delay(10);
scl=0;
delay(10);
}
return dat;
}
void pcf8591wrbyte(uint8 channel)
{
iicinit();
iicstart();
iicwrbyte(0x90); //pcf8591寫數(shù)據(jù) 1001 A2A1A0 R/W
ack();
iicwrbyte(channel|0x70); //通過打開通道channelX，模擬輸出使能打開
noack();
iicstop();
}
uint8 pcf8591read()
{
uint8 dat;
iicinit();
iicstart();
iicwrbyte(0x90);
ack();
iicstart();
iicwrbyte(0x91); // pcf8591讀數(shù)據(jù) 1001 A2A1A0 R/W
ack();
dat=iicread();
noack();
iicstop();
return dat;
}
void pcf8591dac(uint8 value) //DA轉(zhuǎn)換
{
iicinit();
iicstart();
iicwrbyte(0x90);
ack();
iicwrbyte(0x70); //不需要打開通道channelX，模擬輸出使能打開
ack();
iicwrbyte(value);
noack();
iicstop();
}
uint8 keyscan() //按鍵掃描程序
{
uint8 h,l,value;
P1=0x0f;
h=P1&0x0f;
if(h!=0x0f)
{
delay(1);
if(h!=0x0f)
{
h=P1&0x0f;
l=P1|0xf0;
P1=l;
l=P1&0xf0;
h=P1&0x0f;
value=h+l;
}
return value;
}
}
void keypros() //按鍵處理函數(shù)
{
uint8 key;
key=keyscan();
switch(key)
{
case 0xee: kn=0;break;
case 0xde: kn=1;break;
case 0xbe: kn=2;break;
case 0x7e: kn=3;break;
case 0xed: kn=4;break;
case 0xdd: kn=5;break;
case 0xbd: kn=6;break;
case 0x7d: kn=7;break;
case 0xeb: kn=8;break;
case 0xdb: kn=9;break;
case 0xbb: break;
case 0x7b: break;
case 0xe7: kn=12;break; //小數(shù)點(diǎn)按下標(biāo)志位
case 0xd7: kn=11;break; //計價確認(rèn)按鍵標(biāo)志
case 0xb7: kn=13;break; //clear,清空計價輸入
case 0x77: break;
default : break;
}
}
void datapros()
{
uint8 i,count=0;
do //將按鍵值保存在數(shù)組keynum中
{
P1=0x0f;
if(P1!=0x0f)
{
keypros();
P1=0x0f;
while(P1!=0x0f);//等待按鍵松開
if(kn>=0&&kn<=9)
{
keynum[count]=kn;
wrc(0x0b+count+0x80); //移位顯示
wrd(keynum[count]+0x30);
count++;
}
if(kn==13) //清除按鍵計價數(shù)
{
wrc(0x01);//清屏處理
pric=0;
}
if(kn==11) //當(dāng)計價確認(rèn)按鍵按下時候退出循環(huán)
{
goto xian;
}
}
}
while(count<=2);
if(count>=2)
{
goto xian;
}
xian: for(i=0;i<count;i++)
{
pric=pric*10+keynum[i];
if(i==count)count=0;//當(dāng)進(jìn)行一次轉(zhuǎn)換后清空計數(shù)器的值
}
}
void display()
{
float v;
uint8 i;
uint16 price;
pcf8591wrbyte(0); //電位器轉(zhuǎn)換
ad[0]=pcf8591read(); //讀取第一次之前的那次數(shù)據(jù)
delay(10);
v=ad[0]*0.01953;//將電位器的數(shù)據(jù)轉(zhuǎn)換成電壓值
v=v*100;//取2位有效數(shù)值
ad[0]=v;
price=ad[0]*pric; //每千克多少錢如果我們定義每千克2元那么就可以乘以2，如果為其他我們可以乘以其他數(shù),最大定義的價格是200元每千克
wrc(0x00+0x80);
for(i=0;i<8;i++)
{
wrd(d1[i]);
}
wrc(0x40+0x80);
wrd('m');
wrd(':');
wrd(num[ad[0]/100]);
wrd('.');
wrd(num[ad[0]%100/10]);
wrd(num[ad[0]%100%10]);
// wrd(num[ad[0]%1000%100%10]);
wrd('K');
// wrd('G');
ad[4]=ad[0];
pcf8591dac(ad[4]/2);//將數(shù)字量轉(zhuǎn)換為模擬量由pcf8591的AOUT輸出
wrd(' ');
wrd('P');
wrd(':');
wrd(num[price/10000]);//為什么是除以10000，本來不計價的話是除以100，但是計價最大可以使百位數(shù)，所以除以的數(shù)也得乘以100
wrd(num[price%10000/1000]);
wrd(num[price%10000%1000/100]);
wrd('.');
if((price%10000%1000%100%10)>=5) //進(jìn)價，四舍五入法
wrd(num[(price%10000%1000%100/10)+1]);
else
wrd(num[price%10000%1000%100/10]);
wrd('
);
}
void main()
{
init();
while(1)
{
display();
datapros();
}
}