写一个dht11显示在lcd屏上，并用HCsr04测距的程序，C51

以下是基于C51单片机的DHT11和HC-SR04程序：

#include <reg52.h>
#include <intrins.h>

#define LCD_RS P2_0     //LCD命令/数据选择
#define LCD_RW P2_1     //LCD读/写选择
#define LCD_EN P2_2     //LCD使能信号
#define LCD_DAT P0      //LCD数据口

sbit DHT_DAT = P1^0;    //DHT11数据口
sbit TRIG = P1^1;       //HC-SR04触发信号
sbit ECHO = P1^2;       //HC-SR04回波信号

unsigned char humi, temp;   // DHT11湿度和温度
unsigned int distance;      // HC-SR04距离

void delay_us(unsigned int us)
{
    while(us--)
    {
        _nop_();
        _nop_();
    }
}

void delay_ms(unsigned int ms)
{
    while(ms--)
    {
        delay_us(1000);
    }
}

void lcd_init()
{
    LCD_RS = 0;
    LCD_RW = 0;
    LCD_EN = 0;
    delay_ms(15);
    LCD_DAT = 0x30;
    LCD_EN = 1;
    delay_ms(5);
    LCD_EN = 0;
    delay_ms(5);
    LCD_DAT = 0x30;
    LCD_EN = 1;
    delay_ms(5);
    LCD_EN = 0;
    delay_ms(5);
    LCD_DAT = 0x30;
    LCD_EN = 1;
    delay_ms(5);
    LCD_EN = 0;
    delay_ms(5);
    LCD_DAT = 0x38;
    LCD_EN = 1;
    delay_ms(5);
    LCD_EN = 0;
    delay_ms(5);
    LCD_DAT = 0x08;
    LCD_EN = 1;
    delay_ms(5);
    LCD_EN = 0;
    delay_ms(5);
    LCD_DAT = 0x01;
    LCD_EN = 1;
    delay_ms(5);
    LCD_EN = 0;
    delay_ms(5);
    LCD_DAT = 0x06;
    LCD_EN = 1;
    delay_ms(5);
    LCD_EN = 0;
    delay_ms(5);
    LCD_DAT = 0x0c;
    LCD_EN = 1;
    delay_ms(5);
    LCD_EN = 0;
    delay_ms(5);
}

void lcd_write_cmd(unsigned char cmd)
{
    LCD_RS = 0;
    LCD_RW = 0;
    LCD_DAT = cmd;
    LCD_EN = 1;
    delay_us(5);
    LCD_EN = 0;
    delay_us(5);
}

void lcd_write_data(unsigned char dat)
{
    LCD_RS = 1;
    LCD_RW = 0;
    LCD_DAT = dat;
    LCD_EN = 1;
    delay_us(5);
    LCD_EN = 0;
    delay_us(5);
}

void lcd_clear()
{
    lcd_write_cmd(0x01);
    delay_ms(5);
}

void lcd_setpos(unsigned char x, unsigned char y)
{
    unsigned char pos;
    if(x == 0)
    {
        pos = 0x00 + y;
    }
    else
    {
        pos = 0x40 + y;
    }
    lcd_write_cmd(pos | 0x80);
    delay_us(5);
}

void lcd_write_str(unsigned char x, unsigned char y, unsigned char *str)
{
    lcd_setpos(x, y);
    while(*str)
    {
        lcd_write_data(*str++);
    }
}

void dht11_read()
{
    unsigned char i, j;
    unsigned char buffer[5] = {0};
    DHT_DAT = 0;
    delay_ms(20);
    DHT_DAT = 1;
    delay_us(30);
    if(!DHT_DAT)
    {
        while(!DHT_DAT);
        while(DHT_DAT);
        for(i=0; i<5; i++)
        {
            for(j=0; j<8; j++)
            {
                while(!DHT_DAT);
                delay_us(30);
                if(DHT_DAT)
                {
                    buffer[i] |= 1 << (7-j);
                }
                while(DHT_DAT);
            }
        }
        humi = buffer[0];
        temp = buffer[2];
    }
}

void hc_sr04_read()
{
    unsigned int time;
    TRIG = 0;
    delay_us(2);
    TRIG = 1;
    delay_us(10);
    TRIG = 0;
    while(!ECHO);
    while(ECHO)
    {
        time++;
        delay_us(1);
    }
    distance = time / 58;
}

void main()
{
    lcd_init();
    lcd_clear();
    while(1)
    {
        dht11_read();
        hc_sr04_read();
        lcd_write_cmd(0x80);
        lcd_write_str(0, 0, "Humi:");
        lcd_write_data(humi);
        lcd_write_str(0, 6, "%");
        lcd_write_str(1, 0, "Temp:");
        lcd_write_data(temp);
        lcd_write_str(1, 6, "C");
        lcd_write_cmd(0xc0);
        lcd_write_str(2, 0, "Dist:");
        lcd_write_data(distance / 100);
        lcd_write_data(distance % 100 / 10);
        lcd_write_data(distance % 10);
        lcd_write_str(2, 3, "cm");
        delay_ms(1000);
    }
}

上述程序中，我们使用DHT11读取环境温度和湿度，使用HC-SR04测量距离，并将它们显示在LCD屏幕上。