dht11的c语言程序.doc

#include #define uint unsigned int #define uchar unsigned char sbit TRH = P10;/温湿度传感器DHT11数据接入uchar str=0,0,0,0,0,0,0,0; uint TH,TL,RH,RL,CK; uint THc,TLc,RHc,RLc,CKc; uint xh,sum; / void delay(uchar s) /延时10us/ / uchar v;/ for(;s0;s-)/ for(v=25;v0;v-);/ void delay(uchar b) /误差 0us unsigned char a; for(;b0;b-) for(a=2;a0;a-);/void delay1( )/ 延时20ms/ /uchar x,y,z;/for(x=15;x0;x-)/for(y=4;y0;y-)/for(z=248;z0;z-);/void delay1(uchar c) /误差 0us unsigned char a,b; for(;c0;c-) for(b=142;b0;b-) for(a=2;a0;a-);void delay2()/数码管显示用的延时 uchar l,j,k;for(l=2;l0;l-)for(j=4;j0;j-)for(k=100;k0;k-); void start() TRH=1; delay(2); TRH=0; /主机拉低18ms delay1(20); TRH=1; /DATA总线由上拉电阻拉高主机延时20 delay(3); uchar receive() uchar i,temp; xh=0; while(TRH); for(i=0;i8;i+) while(!TRH); delay(3); if(TRH) temp=1;while(TRH); else temp=0; xh=1; xh|=temp; return (xh); void display()uchar a=0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90;uchar m,n,s,i; m= str3;/数码管显示部分 n= str4; s= str5; while(1) for(i=0;i10;i+) if(m=i) m=ai; P0=m; P2=0x10; delay2(); for(i=0;i10;i+) if(n=i) n=ai; P0=n-0X80; P2=0x20; delay2(); for(i=0;i10;i+) if(s=i) s=ai; P0=s; P2=0x40;delay2(); P0=0X9C; P2=0x80; delay2(); void main() while(1) start(); TRH=1; / 读取数据并写入指令 if(!TRH) while(!TRH); /判断DHT11发出 80us 的低电平响应信号是否结束while(TRH); delay(8); RHc = receive(); /数据接收状态 RLc = receive(); THc = receive(); TLc = receive(); CKc = receive(); TRH=1; sum=(RHc+RLc+THc+TLc);/数据校验 if(sum=CKc) RH = RHc; RL = RLc; TH= THc; TL = TLc; CK = CKc; str0 =RH/10; /湿度整数部分 str1 =RH%1