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《DHT11温湿度测量电路图及程序》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。
1、#include#defineuintunsignedint#defineucharunsignedcharsbitio=P1^0;//DHT11数据端sbitwela=P2^7;//数码管位选sbitdula=P2^6;//数码管段选uchardata_byte;ucharRH,RL,TH,TL;uchartable[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x98};ucharwei[]={0x01,0x02,0x04,0x08,0x10,0x2
2、0,0x40,0x80};voiddelay(ucharz){ucharx,y;for(x=z;x>0;x--)for(y=110;y>0;y--);}voiddelay1()//延时10us{uchari;i--;i--;i--;i--;i--;i--;}voidstart()//开始信号{io=1;delay1();io=0;delay(20);//>18msio=1;delay1();//20-40usdelay1();delay1();delay1();delay1();}ucharreceive_byte(){u
3、chari,temp,count;for(i=0;i<8;i++){count=2;while((!io)&&count++)//等待50us低电平结束temp=0;delay1();delay1();delay1();delay1();if(io==1)temp=1;count=2;while((io)&&count++);if(count==1)break;data_byte<<=1;data_byte
4、=temp;}returndata_byte;}voidreceive(){ucharT_H,T_L,R_H,R_L
5、,check,num_check;ucharcount;start();//开始信号io=1;if(!io)//读取DHT11响应信号{count=2;while((!io)&&count++);//DHT11高电平80us是否结束count=2;while((io)&&count++);R_H=receive_byte();R_L=receive_byte();T_H=receive_byte();T_L=receive_byte();check=receive_byte();io=0;//拉低延时50usdelay1(
6、);delay1();delay1();delay1();delay1();io=1;num_check=R_H+R_L+T_H+T_L;if(num_check=check){RH=R_H;RL=R_L;TH=T_H;TL=T_L;check=num_check;}}}voiddisplay(uchari,ucharj)//数码管显示{P0=wei[i];wela=1;wela=0;P0=0xff;P0=table[j/10];dula=1;dula=0;delay(1);P0=0xff;P0=wei[i+1];wela
7、=1;wela=0;P0=0xff;P0=table[j%10];dula=1;dula=0;delay(1);}voidmain(){while(1){receive();display(0,RH);delay(1);display(2,TH);delay(1);//display(4,TH);//delay(1);//display(6,TL);//delay(1);}}
