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1.思路：

        代码还要封装！

        延迟1秒；串口初始化；LCD1602显示屏初始化；延迟两秒；ledone不亮；

        while循环，延迟1秒，DHT模块读取数据；封装接收数据函数；发送湿度数据；发送温度数据

注：在这段代码中；ledOne = P3^7; dht = P3^3; datas [5] （接收DHT11的数据）; temp[8] ,huma[8] (用来存取接受的数据);

2.加继电器和小风扇模块

        sbit fengshan = P1^6;

             //datas[2] 是温度

          if(datas[2] > 25){

                fengshan = 0;   // 超过25度给我转      

        }

#include "reg52.h"
#include "intrins.h"sbit ledOne = P3^7;
sbit dht    = P3^3;char datas[5];
sfr	AUXR  = 0x8E;#define databuffer P0
sbit RS = P1^0;
sbit RW = P1^1;
sbit EN = P1^4;
sbit fengshan = P1^6;char temp[8];
char huma[8];void Delay15ms()		//@11.0592MHz
{unsigned char i, j;i = 27;j = 226;do{while (--j);} while (--i);
}void Delay5ms()		//@11.0592MHz
{unsigned char i, j;i = 9;j = 244;do{while (--j);} while (--i);
}void check_busy() //?
{char tmp = 0x80;databuffer = 0x80;while(tmp & 0x80){ //1000 0000RS = 0;RW = 1;EN = 0;      //??????·_nop_();     //???????,??EN = 1;      //??2?_nop_();_nop_();tmp = databuffer;EN = 0;      //??_nop_();}
}void Write_Cmd_Func(char cmd)
{check_busy();RS = 0;RW = 0;EN = 0;_nop_();databuffer = cmd;_nop_();EN = 1;_nop_();_nop_();EN = 0;_nop_();
}void Write_Data_Func(char dataShow)
{check_busy();RS = 1;RW = 0;EN = 0;_nop_();    //??1.085usdatabuffer = dataShow;_nop_();EN = 1;_nop_();_nop_();EN = 0;_nop_();
}void UartInit(void)
{AUXR = 0x01;SCON = 0x40;TMOD &= 0xF0;TMOD |= 0x20;TH1 =0xFD;TL1 =0xFD;TR1 = 1;
}void sendByte(char data_msg)
{SBUF = data_msg;while(!TI);       //(TI==0)   TI = 0;}void sendString(char *str)
{while(*str != '\0'){sendByte(*str);str++;}
}void Delay1000ms()		//@11.0592MHz
{unsigned char i, j, k;_nop_();i = 8;j = 1;k = 243;do{do{while (--k);} while (--j);} while (--i);
}void Delay30ms()		//@11.0592MHz
{unsigned char i, j;i = 54;j = 199;do{while (--j);} while (--i);
}void Delay40us()		//@11.0592MHz
{unsigned char i;_nop_();i = 15;while (--i);
}void DHT11_Start()
{dht = 1;dht = 0;Delay30ms();dht = 1;//Dwhile(dht);while(!dht);while(dht);}void Read_Data_From_DHT()
{int i; //ÂÖint j; // ÿÂÖ¶Á¶àÉÙ´Îchar tmp;char flag;DHT11_Start();for(i = 0;i<5;i++){//¿¨gµã: while(!dht)    ÓÐЧÊý¾ÝÊǸߵçƽ£¬³ÖÐøʱ¼ä²»Ò»Ñù£¬50us¶Á£¬µÍµçƽ0 ¸ßµçƽ1for(j = 0;j<8;j++){while(!dht); // µÈ´ý¿¨gµã  Delay40us();if(dht==1){flag = 1;while(dht); //}else{flag = 0;}tmp = tmp << 1;tmp |= flag;  //}datas[i] = tmp;}
}void LCD1602_showLine(char row,char col,char *string)
{switch(row){case 1:Write_Cmd_Func(0x80+col);while(*string){Write_Data_Func(*string);string++;}break;case 2:Write_Cmd_Func(0x80+0x40+col);while(*string){Write_Data_Func(*string);string++;}break;}
}void LCD1602_INIT()
{Delay15ms();Write_Cmd_Func(0x38);Delay5ms();Write_Cmd_Func(0x38);Write_Cmd_Func(0x08);Write_Cmd_Func(0x01);Write_Cmd_Func(0x06);Write_Cmd_Func(0x0c);}void Bulid_Datas()
{huma[0] = 'H';huma[1] = datas[0]/10 + 0x30;huma[2] = datas[0]%10 + 0x30;huma[3] = '.';huma[4] = datas[1]/10 + 0x30;huma[5] = datas[1]%10 + 0x30;huma[6] = '%';huma[7] = '\0';temp[0] = 'T';temp[1] = datas[2]/10 + 0x30;temp[2] = datas[2]%10 + 0x30;temp[3] = '.';temp[4] = datas[3]/10 + 0x30;temp[5] = datas[3]/10 + 0x30;temp[6] = 'C';temp[7] = '\0';}void main()
{Delay1000ms();UartInit();if(datas[2] > 25){fengshan = 0;   // 超过25度给我转      }LCD1602_INIT();Delay1000ms();Delay1000ms();ledOne = 1;while(1){Delay1000ms();Read_Data_From_DHT();Bulid_Datas();sendString(huma);sendString("\r\n");sendString(temp);sendString("\r\n");LCD1602_showLine(1,2,huma);LCD1602_showLine(2,2,temp);}
}