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《基于单片机的多路温度检测系统设计.docx》由会员上传分享，免费在线阅读，更多相关内容在工程资料-天天文库。
1、#include#defineuintunsignedint#defineucharunsignedcharsbitlcdrs=P3^0;sbitlcdrw=P3^1;sbitlcden=P3^2;//LCD选通线sbitDQ=P1^7;//18B20引脚uintvalue;//温度值sbitsound=P1^6;//蜂鸣器sbitwarning=P3^5;//LED报警灯sbitgreenled=P3^6;//LED报警灯sbitk1=P1^0;//setsbitk2=P1^1;//+sbit
2、k3=P1^2;//-charmax=40;//初始温度最大值charmin=10;//初始温度最小值ucharchange_flag;//按键次数ucharcodetable1[]={0x28,0x30,0xc5,0xb8,0x00,0x00,0x00,0x8e};//rom1测得的序列号ucharcodetable2[]={0x28,0x31,0xc5,0xb8,0x00,0x00,0x00,0xb9};//rom2ucharcodetable3[]={0x28,0x32,0xc5,0xb8,0x00,0x0
3、0,0x00,0xe0};//rom3ucharcodetable4[]={0x28,0x33,0xc5,0xb8,0x00,0x00,0x00,0xd7};//rom4ucharcodetable5[]="Temple";ucharcodetable6[]="max:min:";uinttemper[5];//温度值缓存bitfg=0;//温度正负标志voiddelay(uintn){uintx,y;for(x=n;x>0;x--)for(y=110;y>0;y--);}voidwrite_com(ucharc
4、om){lcdrs=0;//rs=0时输入指令P2=com;delay(5);lcden=1;//en=1时读取信息delay(5);lcden=0;//1->0执行指令}voidwrite_dat(uchardat){lcdrs=1;//rs=1时输入数据P2=dat;delay(5);lcden=1;delay(5);lcden=0;}voidinit_lcd(){lcden=0;lcdrw=0;write_com(0x38);//8位数据，双列，5*7字形write_com(0x0c);//开启显示屏，关光
5、标，光标不闪烁write_com(0x06);//显示地址递增，即写一个数据后，显示位置右移一位write_com(0x01);}voiddelay_us(uchart)//微妙延时{while(t--);}voidinit_ds18b20()//数据初始化{DQ=1;delay_us(4);DQ=0;delay_us(80);DQ=1;delay_us(200);}voidwrite_ds18b20(uchardat)//写数据{uchari;for(i=0;i<8;i++){DQ=0;DQ=dat&0x01;
6、delay_us(15);DQ=1;dat=dat>>1;}delay_us(10);}ucharread_ds18b20()//读数据{uchari=0,readat=0;for(i=0;i<8;i++){DQ=0;readat=readat>>1;//八位全部都是0，向右移一位后，仍然全是0DQ=1;if(DQ)//如果DQ为1，readat进行或运算，如果为0，则子语句不执行，直接for循环此时采集的数据是0readat=readat
7、0x80;//此时最高位为1，然后再进行for循环最高位成为第七位，依次
8、往复delay_us(10);}returnreadat;}voidcheck_rom(uchara)//匹配序列号{ucharj;write_ds18b20(0x55);if(a==1){for(j=0;j<8;j++){write_ds18b20(table1[j]);}}if(a==2){for(j=0;j<8;j++){write_ds18b20(table2[j]);}}if(a==3){for(j=0;j<8;j++){write_ds18b20(table3[j]);}}if(a==4){for(j
9、=0;j<8;j++){write_ds18b20(table4[j]);}}}uintchange_ds18b20(ucharz)//为DS18B20序号{uchartl,th;init_ds18b20();//初始化write_ds18b20(0xcc);//跳过init_ds18b20();if(z==1){check_rom(1);//匹配rom1}if(z==2
