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#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
uchar a,b,c,d;
uchar p;
uint k=0;
uint j=0;
uchar i;
uint num;
uint shi,ge,xiaoshu;
uint sign; //報(bào)警標(biāo)識(shí)位
uchar R_data[14]="TempXX.XAlarmX"; //串口接收
uchar Byte[6]="xxtoxx"; //串口發(fā)送 數(shù)組內(nèi)可以不寫內(nèi)容
int count=1; //初始串口接收為1個(gè)周期
sbit lcdrs=P2^0;
sbit lcdrw=P2^1;
sbit lcden=P2^2; //LCD液晶屏
sbit beep=P2^5; //蜂鳴器
sbit P3_2=P3^2;
sbit P3_3=P3^3;
sbit P3_4=P3^4;
sbit P3_5=P3^5; //四個(gè)按鍵
uchar code t0[]="Current T ";
uchar code t1[]="low high ";
uchar code wendu[]="0123456789"; //利用一個(gè)溫度表解決溫度顯示亂碼
sbit DS=P2^6;
sbit D=P2^3; //繼電器
void Uart_Init(void)
{
TMOD = 0x20; //定時(shí)器工作在定時(shí)器1的方式2
PCON = 0x00; //不倍頻
SCON = 0x50; //串口工作在方式1，并且啟動(dòng)串行接收
TH1 = 0xFd; //設(shè)置波特率 9600
TL1 = 0xFd;
TR1 = 1; //啟動(dòng)定時(shí)器1
ES = 1; //開串口中斷
EA = 1; //開總中斷
}
void Uart_Send()
{
for(i=0;i<14;i++)
{
if(i==4) R_data[i]=shi+0x30;
if(i==5) R_data[i]=ge+0x30;
if(i==7) R_data[i]=xiaoshu+0x30;
if(i==13) R_data[i]=sign+0x30; //串口接收中第5,6,8,14個(gè)字符改為相應(yīng)的數(shù)字
SBUF=R_data[i];
while(!TI);
TI=0;
}
}
void delay(uint z)
{
uchar x,y;
for(x=2000;x>1;x--)
for(y=z;y>1;y--);
}
void write_com(uchar com)
{
lcdrs=0;
P0=com;
delay(5);
lcden=1;
delay(5);
lcden=0;
}
void write_date(uchar date)
{
lcdrs=1;
P0=date;
delay(5);
lcden=1;
delay(5);
lcden=0;
}
void init_lcd()
{
lcden=0;
lcdrw=0;
write_com(0x38);
write_com(0x01);
write_com(0x0c);
write_com(0x06);
write_com(0x80);
for(i=0;i<20;i++)
{
write_date(t0[i]);
delay(0);
}
write_com(0x80+0x40);
for(i=0;i<16;i++)
{
write_date(t1[i]); //初始化中顯示
delay(0);
}
}
void tmpDelay(int num)
{
while(num--) ;
}
void Init_DS18B20()
{
unsigned char x=0;
DS=1;
tmpDelay(8);
DS=0;
tmpDelay(80);
DS=1;
tmpDelay(14);
x=DS;
tmpDelay(20);
}
unsigned char ReadOneChar()
{
unsigned char i=0;
unsigned char dat=0;
for(i=8;i>0;i--)
{
DS=0;
dat>>=1;
DS=1;
if(DS)
dat|=0x80;
tmpDelay(4);
}
return(dat);
}
void WriteOneChar(unsigned char dat)
{
unsigned char i=0;
for(i=8;i>0;i--)
{
DS=0;
DS=dat&0x01;
tmpDelay(5);
DS=1;
dat>>=1;
}
}
unsigned int Readtemp()
{
unsigned char a=0; //溫度高8位
unsigned char b=0; //溫度低8位
unsigned int t=0;
float tt=0;
Init_DS18B20();
WriteOneChar(0xCC);
WriteOneChar(0x44);
Init_DS18B20();
WriteOneChar(0xCC);
WriteOneChar(0xBE);
a=ReadOneChar();
b=ReadOneChar();
t=b; //讀溫度低8位
t<<=8;
t=t|a; //讀溫度高8位
tt=t*0.0625; //DS18B20精度
t=tt*10+0.5; //溫度取十倍以便四舍五入
return(t);
}
void display()
{
uint tempmin[6]={15,16,17,18,19,20}; //設(shè)置溫度下限域
uint tempmax[6]={25,26,27,28,29,30}; //設(shè)置溫度上限域
uint tempra; //讀取當(dāng)前溫度
if(P3_2==0) //最小值減
{
delay(5);
if(P3_2==0)
{
if(k<=1) k=1; k--;
while(!P3_2);
}
}
if(P3_3==0) //最小值加
{
delay(5);
if(P3_3==0)
{
k++; if(k>=5) k=5;
while(!P3_3);
}
}
if(P3_4==0) //最大值減
{
delay(5);
if(P3_4==0)
{
if(j<=1) j=1; j--;
while(!P3_4);
}
}
if(P3_5==0) //最大值加
{
delay(5);
if(P3_5==0)
{
j++; if(j>=5) j=5;
while(!P3_5);
}
}
if(p!=1)
{a=tempmin[k]/10%10+0x30; //顯示溫度下限值的十位，加0x30可以把數(shù)值型轉(zhuǎn)換成字符型來顯示在液晶屏上
b=tempmin[k]%10+0x30; //顯示溫度下限值個(gè)位
c=tempmax[j]/10%10+0x30; //顯示溫度上限值十位
d=tempmin[j]%10+0x30;} //顯示溫度上限值個(gè)位
write_com(0x80+0x40+5);
write_date(a);
write_com(0x80+0x40+6);
write_date(b);
write_com(0x80+10);//6
write_date(wendu[shi]);
write_com(0x80+11); //7
write_date(wendu[ge]);
write_com(0x80+12); //8
write_date(0x2e);
write_com(0x80+13);
write_date(wendu[xiaoshu]);
write_com(0x80+14);
write_date(0xdf);
write_com(0x80+15);
write_date(0x43);
write_com(0x80+0x40+14);
write_date(c);
write_com(0x80+0x40+15); //按位分為顯示下限值 當(dāng)前溫度值℃ 上限值
write_date(d);
tempra=shi*10+ge;
if(tempra<tempmin[k] || tempra>=tempmax[j]) {D=0;sign=1;} else {D=1;sign=0;}//若在報(bào)警范圍內(nèi)，繼電器燈亮，蜂鳴器響
}
void main()
{
beep=1;
init_lcd();
Uart_Init();
while(1)
{
num=Readtemp();
shi=num/100; //讀取溫度為十倍，所以取百位即為溫度的十位
ge=num/10%10;
xiaoshu=num%10;
display();
if(sign)
beep=0;
else
beep=1;
delay(1);
Uart_Send();
delay(20*count);
}
}
void Com_Int() interrupt 4
{
static uchar g=0;
EA=0;
if(RI==1)
{ p=1 ;
Byte[g]=SBUF;
RI=0;
g++;
if(g==8) g=0;
}
a=(Byte[1]);
b=(Byte[2]);
c=(Byte[5]);
d=(Byte[6]);
//讀取周期數(shù)
EA=1;
}
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