DHT11测温湿度程序lcd1602显示

1、DHT11测温湿度程序lcd1602显示#include#include#define uchar unsigned char #define uint unsigned int #define Data P0 / 数据端口sbit RS=P2A4;sbit RW=P2A5;sbit E=P2A6;sbit DHT=P1A0;uchar FirstLine =wen:00.00; /第一行数据uchar SecondLine=shi:00.00; /第二行数据unsigned char shiZ,shiX,wenZ,wenX,check;unsigned char tr_shiZ,tr_shi

2、X,tr_wenZ,tr_wenX;unsigned char flag;unsigned int n=20,m;void delay_1ms(unsigned int i) unsigned int j=88;for(;i0;i-)while(j0)j-;void delay_10us()unsigned char i; i-;i-;i-;i-;i-;i-;温湿度读取函数*/char read_data()unsigned char i,num,temp;num=0;for(i=0;i8;i+)flag=2;while(!DHT)&flag+);delay_10us();delay_10us

3、();delay_10us();if(DHT=1)temp=1;flag=2;while(DHT&flag+);elsetemp=0;num0;i-) for(j=100;j0;j-); void DelayUs(unsigned char us) /- unsigned char uscnt;uscnt=us1; /*12MHz 频率 */ while(-uscnt); void DelayMs(unsigned char ms) while(-ms)DelayUs(250);DelayUs(250);DelayUs(250);DelayUs(250);void lcd_write_com(

4、uchar c) / 写命令 DelayMs(5);/ 操作前短暂延时，保证信号稳定E=0;RS=0;RW=0;_nop_();E=1;Data=c;E=0;void lcd_write_dat(uchar c) / 写数据 DelayMs(5); / 操作前短暂延时，保证信号稳定 E=0;RS=1;RW=0;_nop_();E=1;Data=c;E=0;RS=0;void lcd_init() /LCD 初始化DelayMs(15);lcd_write_com(0x38); /display modelcd_write_com(0x38); /display modelcd_write_co

5、m(0x38); /display modelcd_write_com(0x06); /显示光标移动位置lcd_write_com(0x0c); /显示开及光标设置lcd_write_com(0x01); /显示清屏显示单个字符 4 位为 0xcvoid ShowChar(uchar pos,uchar c) / unsigned char p;if (pos=0x10) p=pos+0xb0; / 是第二行则命令代码高else p=pos+0x80; / 是第二行则命令代码高 4 位为 0x8 lcd_write_com(p);/ 写命令 lcd_write_dat(c); / 写数据voi

6、d ShowString (uchar line,char *ptr) /显示字符串unsigned char l,*p;p=ptr;l=line4;while(*p)!=0)ShowChar(l+,*(p);p+;void disp(void) /主函数调用的显示函数 ShowString(0,FirstLine);ShowString(1,SecondLine); void read_init()初始化及采集程序 */DHT=O; /主机使DHT11低电平并延时至少18ms delay_1ms(21);DHT=1; /主机置DHT11高电平2040us,并等待从机相应 delay_1Ous

7、();delay_10us();delay_10us();delay_10us();DHT=1;if(!DHT) / 从机发出相应信号flag=2; while(!DHT)&flag+);开始采集数据采集湿度整数部分 采集湿度小数部分 采集温度整数部分 采集温度小数部分 采集校验位flag=2; while(DHT&flag+); / tr_shiZ=read_data();/ tr_shiX=read_data();/ tr_wenZ=read_data();/ tr_wenX=read_data();/ check=read_data(); / DHT=1;void main()unsigned char temp; lcd_init();delay(50); while(1) disp();read_init();temp=tr_shiZ+tr_shiX+tr_wenZ+tr_wenX; if(check=temp)shiZ=tr_shiZ; shiX=tr_shiX; wenZ=tr_wenZ; wenX=tr_wenX;FirstLine4=0+wenZ/10;FirstLine5=0+wenZ%10;FirstLine