DHT11温湿度传感器驱动程序-C51单片机

/*DHT11 简单应用 显示在数码管上（我的数码管是两个74HC595 不懂的可以问我）*建议显示在液晶上*/#include#includechar T_H1,T_L1,RH_H1,RH_L1,checkdata1;char T_H2,T_L2,RH_H2,RH_L2,checkdata2;char F16T,F16RH,tshi,tge,rhshi,rhge;sbit DHT11 = P21;uchar bdata output;uchar location,j,i,ge,shi;uint num=0,num1,num2;uchar code segment= 0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77, /*共阴7段LED段码表*/ 0x7c,0x39,0x5e,0x79,0x71,0x76,0x73,0x3e,0x00;sbit srclk=P42;sbit rclk = P41;sbit ser = P44;sbit out_put= output7; /*传感器接受数据的响应命令*/ void delay(uint x); void Delay32us(); void Delay22ms(); void Delay500ms();void shumaguan(uchar wei,uchar duan)output = wei;for(j=0;j8;j+)/位码ser = out_put;srclk=0;srclk=1;srclk=0;output = _crol_(output,1);output = duan;/段码for(j=0;j8;j+)ser=out_put;srclk=0;srclk=1;srclk=0;output = output1; rclk=0;rclk=1;rclk=0;void shuru() num=0; while(num1000) shumaguan(0x01,segmenttshi);shumaguan(0x02,segmenttge);shumaguan(0x10,segmentrhshi);shumaguan(0x20,segmentrhge);shumaguan(0,segment19); char COM(void) char i,temp,comdata; /*判断信号时0还是1*/for(i=0;i8;i+) while(!DHT11); Delay32us(); temp=0; if(DHT11) temp=1; /当DHT11变为低电平时，开始下bit 的传送comdata = comdata1;comdata = comdata|temp; while(DHT11);return comdata; /*主机的开始信号 和 从机的响应信号*/*DHT11的主函数*/void getDHT11() DHT11=0; Delay22ms(); /主机拉低22ms DHT11=1; Delay32us(); /总线由上拉电阻拉高 主机延时20-40us /判断从机是否有低电平响应信号 如不响应则跳出，响应则向下运行 if(!DHT11) /T ! /判断从机是否发出 80us 的低电平响应信号是否结束 while(!DHT11); /判断从机是否发出 80us 的高电平，如发出则进入数据接收状态 while(DHT11); /*接收数据的命令 每次传送八位*/RH_H1 = COM();RH_L1 = COM();T_H1 = COM();T_L1 = COM();checkdata1 = COM(); if(T_H1+T_L1+RH_H1+RH_L1=checkdata1) RH_H2 = RH_H1;RH_L2 = RH_L1;T_H2 = T_H1;T_L2 = T_L1;F16RH = RH_H2+RH_L2/1000;F16T = T_H2+T_L2/1000;tshi = F16T/10;tge = F16T%10;rhshi = F16RH/10;rhge = F16RH%10;/*主函数*/void main()EA = 1 ;ET0= 1;TR0 = 1;TMOD = 0X01;TH0 = (65536-1000)/256;TL0 = (65536-1000)%256;while(1)DHT11=0;getDHT11();shuru();/*延时子程序*/void time1() interrupt 1/延时20微秒TH0 = (65536-1000)/256;TL0 = (65536-1000)%256;num=num+1;num1=num1+1;num2=num2+1;void Delay32us()/12.000MHzunsigned char i;_nop_();_nop_();i = 93;while (-i);void Delay22ms()/