基于51单片机的DHT11湿度1602显示c程序.doc

#include#define uint unsigned int#define uchar unsigned charsbit lcden=P27;sbit lcdrw=P25;sbit lcdrs=P26;sbit DHT11_IO=P37;uint x,y,t;uchar code table=0123456789;void Delay1()/延时10usuchar i;i-;i-;i-;i-;i-;i-;void Delay2(uchar ms) / 延时子程序 uchar i ; while(ms-) for(i = 0 ; i0;delay-) for(i=123;i0;i-); void delay(uint z)for(x=z;x0;x-) for(y=110;y0;y-);void write_com(uchar com)lcdrs=0;lcdrw=0;P0=com;delay(5);lcden=1;delay(5);lcden=0;void init()write_com(0x38); write_com(0x0c); write_com(0x06); write_com(0x01); write_com(0x80); void write_data(uchar dat)lcdrs=1;lcdrw=0;P0=dat;delay(5);lcden=1;delay(5);lcden=0;void start(void)/开始信号DHT11_IO=1;Delay1();DHT11_IO=0;Delay2(20);/18msDHT11_IO=1;Delay1();/20-40usDelay1();Delay1();Delay1();Delay1();uchar receive_byte(void)/接收一个字节uchar i,temp,count,data_byte;for(i=0;i8;i+)while(!DHT11_IO);/等待50us低电平结束temp=0;Delay1();Delay1();Delay1();Delay1();if(DHT11_IO=1)temp=1;while(DHT11_IO);data_byte=1;data_byte|=temp;return data_byte;void receive()/接收数据uchar check,num_check,HZ,HX,WZ,WX;start();/开始信号DHT11_IO=1;if(!DHT11_IO)/读取DHT11响应信号while(!DHT11_IO);/DHT11高电平80us是否结束while(DHT11_IO);HZ = receive_byte();HX = receive_byte();WZ = receive_byte();WX = receive_byte();check = receive_byte();DHT11_IO=0;/拉低延时50usDHT11_IO=1;num_check = HZ + HX + WZ + WX;if(num_check = check)check = num_check;write_com(0x80);write_data(tableHZ/10);write_data(tableHZ%10);write_data(.);write_data(tableHX/10);write_data(tableHX%10); write_data(R);write_data(H); write_data(%);/write_com(0x80+0x40);/write_data(tableWZ/10);/write_data(tableWZ%10);/write_data(.);/write_data(tableW