基于51单片机的DHT11温湿度传感器

1、基于 51 单片机的 DHT11 温湿度传感器#include<reg52.h>#include<stdio.h>#define uchar unsigned char#define uint unsigned intsbit dth=P10;sbit dula=P26;sbit wela=P27;uchar s8h,s8h_temp,s8l,s8l_temp,w8h,w8h_temp,w8l,w8l_temp,check8,check8_temp,flag=0; float sd,wd;uchar code table=0x3f,0x06,0x5b,0x4f,0x66

2、,0x6d,0x7d,0x07,0x7f,0x6f,0xbf,0x86,0xdb,0xcf,0xe6,0xed,0xfd,0x87,0xff,0xef;void delayms(uint z)uint x,y;for(x=z;x>0;x-)for(y=110;y>0;y-);voidDelay_10us()/ 进入函数 3usuchar i;/每条语句1usi-;i-;i-;i-;i-;i-;void display(uchar th,uchar tl)uchar ih=0,il=0,jh=0,jl=0,kh=0,kl=0;ih=th/100;jh=th%100/10;kh=th%

3、10;il=tl/100;jl=tl%100/10;kl=tl%10;P0=0xfe;wela=1;wela=0;P0=tableih;dula=1;dula=0;delayms(2);P0=0xfd;wela=1;wela=0;P0=tablejh;dula=1;dula=0;delayms(2);P0=0xfb;wela=1;wela=0;P0=tablekh+10;dula=1;dula=0;delayms(2);P0=0xf7;wela=1;wela=0;P0=tableil;dula=1;dula=0;delayms(2);P0=0xef;wela=1;wela=0;P0=table

4、jl;dula=1;dula=0;delayms(2);P0=0xdf;wela=1;wela=0;P0=tablekl;dula=1;dula=0;delayms(2);char com()uchar i,j,temp,cdata=0;for(i=0;i<8;i+)flag=2;while(!dth)&&(flag+); /等待拉高/ Delay_10us();/ Delay_10us();/ Delay_10us();j=3;while(j-); / 延时 30us temp=0; if(dth=1)temp=1; flag=2; while(dth&&

5、;(flag+);/ 等待拉低/ if(flag=1)break;cdata<<=1;cdata=cdata|temp;return cdata;void getdth()uchar i;dth=0;delayms(18);/18msdth=1;/ Delay_10us();/ Delay_10us();/ Delay_10us();/ Delay_10us();i=4;while(i-); / 延时 40us dth=1;if(dth!=1)/dth11 响应flag=2;while(!dth)&&(flag+); / flag=2;while(dth&&(flag+);/ s8h_temp=com(); s8l_temp=com(); w8h_temp=com();等待拉高等待读入数据w8l_temp=com();check8_temp=com();dth=1;if(s8h_temp+s8l_temp+w8h_temp+w8l_temp)=check8_temp) /校验s8h=s8h_temp;s8l=s8l_temp;w8h=w8h_temp;w8l=w8l_temp;check8=check8_tem