è¿ä¸ªç¨åºä½ å¯ä»¥ç¨æ¥è¯è¯ãæ以ååçã
//温æ§ç³»ç»æ§å¶ç¨åº
//æ¸©åº¦ä¼ æå¨ï¼DS18B20
//æ¾ç¤ºæ¹å¼ï¼LED
#include <reg51.h>
#define uchar unsigned char
sbit keyup=P1^0;
sbit keydn=P1^1;
sbit keymd=P1^2;
sbit out=P3^7; //æ¥æ§å¶ç»§çµå¨
sbit DQ = P3^4; //æ¥æ¸©åº¦ä¼ æå¨18B20
uchar t[2],number=0,*pt; //温度å¼
uchar TempBuffer1[4]={0,0,0,0};
uchar Tmax=18,Tmin=8;
uchar distab[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e,0xff,0xfe,0xf7};
uchar dismod=0,xiaodou1=0,xiaodou2=0,currtemp;
bit flag;
void t0isr() interrupt 1
{
TH0=(65536-5000)/256;
TL0=(65536-5000)%256;
switch(number)
{
case 0:
P2=0x08;
P0=distab[TempBuffer1[0]];
break;
case 1:
P2=0x04;
P0=distab[TempBuffer1[1]];
break;
case 2:
P2=0x02;
P0=distab[TempBuffer1[2]]&0x7f;
break;
case 3:
P2=0x01;
P0=distab[TempBuffer1[3]];
break;
default:
break;
}
number++;
if(number>3)number=0;
}
void delay_18B20(unsigned int i)
{
while(i--);
}
/**********ds18b20åå§åå½æ°**********************/
void Init_DS18B20(void)
{
bit x=0;
do{
DQ=1;
delay_18B20(8);
DQ = 0; //åçæºå°DQæä½
delay_18B20(90); //ç²¾ç¡®å»¶æ¶ å¤§äº 480us
DQ = 1; //æé«æ»çº¿
delay_18B20(14);
x=DQ; //ç¨å延æ¶å å¦æx=0ååå§åæå x=1ååå§å失败,继ç»åå§å
}while(x);
delay_18B20(20);
}
/***********ds18b20读ä¸ä¸ªåè**************/
unsigned char ReadOneChar(void)
{
unsigned char i=0;
unsigned char dat = 0;
for (i=8;i>0;i--)
{
DQ = 0; // ç»èå²ä¿¡å·
dat>>=1;
DQ = 1; // ç»èå²ä¿¡å·
if(DQ)
dat|=0x80;
delay_18B20(4);
}
return(dat);
}
/*************ds18b20åä¸ä¸ªåè****************/
void WriteOneChar(unsigned char dat)
{
unsigned char i=0;
for (i=8; i>0; i--)
{
DQ = 0;
DQ = dat&0x01;
delay_18B20(5);
DQ = 1;
dat>>=1;
}
}
/**************读åds18b20å½å温度************/
unsigned char *ReadTemperature(unsigned char rs)
{
unsigned char tt[2];
delay_18B20(80);
Init_DS18B20();
WriteOneChar(0xCC); //è·³è¿è¯»åºå·åå·çæä½
WriteOneChar(0x44); //å¯å¨æ¸©åº¦è½¬æ¢
delay_18B20(80);
Init_DS18B20();
WriteOneChar(0xCC); //è·³è¿è¯»åºå·åå·çæä½
WriteOneChar(0xBE); //读å温度å¯åå¨çï¼å
±å¯è¯»9个å¯åå¨ï¼å两个就æ¯æ¸©åº¦
tt[0]=ReadOneChar(); //读å温度å¼ä½ä½
tt[1]=ReadOneChar(); //读å温度å¼é«ä½
return(tt);
}
void covert1(void) //å°æ¸©åº¦è½¬æ¢ä¸ºLEDæ¾ç¤ºçæ°æ®
{
uchar x=0x00,y=0x00;
t[0]=*pt;
pt++;
t[1]=*pt;
if(t[1]&0x080) //å¤ææ£è´æ¸©åº¦
{
TempBuffer1[0]=0x0c; //c代表è´
t[1]=~t[1]; /*ä¸é¢å å¥æè´æ°çè¡¥ç */
t[0]=~t[0]; /*æ¢ç®æç»å¯¹å¼*********/
x=t[0]+1;
t[0]=x;
if(x==0x00)t[1]++;
}
else TempBuffer1[0]=0x0a; //A代表æ£
t[1]<<=4; //å°é«åè左移4ä½
t[1]=t[1]&0xf0;
x=t[0]; //å°t[0]æåå°X,å 为åå°æ°é¨åè¿è¦ç¨å°å®
x>>=4; //å³ç§»4ä½
x=x&0x0f; //ååé¢ä¸¤å¥å°±æ¯ååºt[0]çé«åä½
y=t[1]|x; //å°é«ä½åèçææå¼çæ´æ°é¨åæ¼æä¸ä¸ªåè
TempBuffer1[1]=(y%100)/10;
TempBuffer1[2]=(y%100)%10;
t[0]=t[0]&0x0f; //å°æ°é¨å
TempBuffer1[3]=t[0]*10/16;
//以ä¸ç¨åºæ®µæ¶å»éæºè¯¯æ£æ¥é æç误å¤ï¼åªæè¿ç»12次æ£æµå°æ¸©åº¦è¶
åºéå¶æåæ¢å çè£
ç½®
if(currtemp>Tmin)xiaodou1=0;
if(y<Tmin)
{
xiaodou1++;
currtemp=y;
xiaodou2=0;
}
if(xiaodou1>12)
{
out=0;
flag=1;
xiaodou1=0;
}
if(currtemp<Tmax)xiaodou2=0;
if(y>Tmax)
{
xiaodou2++;
currtemp=y;
xiaodou1=0;
}
if(xiaodou2>12)
{
out=1;
flag=0;
xiaodou2=0;
}
out=flag;
}
void convert(char tmp)
{
uchar a;
if(tmp<0)
{
TempBuffer1[0]=0x0c;
a=~tmp+1;
}
else
{
TempBuffer1[0]=0x0a;
a=tmp;
}
TempBuffer1[1]=(a%100)/10;
TempBuffer1[2]=(a%100)%10;
}
void keyscan( )
{
uchar keyin;
keyin=P1&0x07;
if(keyin==0x07)return;
else if(keymd==0)
{
dismod++;
dismod%=3;
while(keymd==0);
switch(dismod)
{
case 1:
convert(Tmax);
TempBuffer1[3]=0x11;
break;
case 2:
convert(Tmin);
TempBuffer1[3]=0x12;
break;
default:
break;
}
}
else if((keyup==0)&&(dismod==1))
{
Tmax++;
convert(Tmax);
while(keyup==0);
}
else if((keydn==0)&&(dismod==1))
{
Tmax--;
convert(Tmax);
while(keydn==0);
}
else if((keyup==0)&&(dismod==2))
{
Tmin++;
convert(Tmin);
while(keyup==0);
}
else if((keydn==0)&&(dismod==2))
{
Tmin--;
convert(Tmin);
while(keydn==0);
}
xiaodou1=0;
xiaodou2=0;
}
main()
{
TMOD=0x01;
TH0=(65536-5000)/256;
TL0=(65536-5000)%256;
TR0=1;
ET0=1;
EA=1;
out=1;
flag=0;
ReadTemperature(0x3f);
delay_18B20(50000); //延æ¶çå¾
18B20æ°æ®ç¨³å®
while(1)
{
pt=ReadTemperature(0x7f); //读å温度,温度å¼åæ¾å¨ä¸ä¸ªä¸¤ä¸ªåèçæ°ç»ä¸
if(dismod==0)covert1();
keyscan();
delay_18B20(30000);
}
}
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