protues仿真51单片机1602液晶显示器显示DS18B20与HD-SR04，温度与距离符合一定条件时驱动蜂鸣器或者步进电机

首先，你需要在Proteus中添加51单片机、DS18B20和HD-SR04以及1602液晶显示屏等元器件。然后，你需要编写51单片机的程序，实现以下功能：

1. 初始化1602液晶显示屏和DS18B20和HD-SR04。
2. 循环读取DS18B20的温度值和HD-SR04的距离值，并将它们显示在1602液晶显示屏上。
3. 如果温度值和距离值符合一定的条件，就让蜂鸣器发出声音或者驱动步进电机运动。

下面是一个示例程序，可以参考一下：

#include <reg51.h>
#include <intrins.h>

#define uchar unsigned char
#define uint unsigned int

sbit trig = P3^5;
sbit echo = P3^2;
sbit beep = P1^5;

uchar code table[] = "Temperature: ";
uchar code table1[] = "Distance: ";
uchar code table2[] = " cm";
uchar code table3[] = "Too Hot or too close!";
uchar code table4[] = "Normal";

uint distance;
uchar temp = 0;
uchar flag = 0;

void delay(uint i)
{
    while(i--);
}

void write_com(uchar com)
{
    P2 = com;
    P0 = 0x00;
    P0 = 0x04;
    delay(5);
    P0 = 0x00;
}

void write_data(uchar dat)
{
    P2 = dat;
    P0 = 0x01;
    P0 = 0x05;
    delay(5);
    P0 = 0x01;
}

void init()
{
    write_com(0x38);
    write_com(0x0e);
    write_com(0x06);
    write_com(0x01);
}

void delayms(uint ms)
{
    uint i, j;

    for(i = 0; i < ms; i++)
        for(j = 0; j < 120; j++);
}

void ds_delay(uint i)
{
    while(i--);
}

uchar ds18b20_init()
{
    uchar i;

    DSPORT = 0;
    ds_delay(80);
    DSPORT = 1;
    ds_delay(2);
    i = DSPORT;
    ds_delay(28);
    i = DSPORT;
    return i;
}

uchar ds18b20_read_byte()
{
    uchar i, j, dat = 0;

    for(i = 0; i < 8; i++)
    {
        DSPORT = 0;
        ds_delay(2);
        DSPORT = 1;
        ds_delay(2);
        j = DSPORT;
        ds_delay(6);
        dat = (j << 7) | (dat >> 1);
    }

    return dat;
}

void ds18b20_write_byte(uchar dat)
{
    uchar i, j;

    for(i = 0; i < 8; i++)
    {
        j = dat & 0x01;
        DSPORT = 0;
        ds_delay(2);
        DSPORT = j;
        ds_delay(60);
        DSPORT = 1;
        dat >>= 1;
    }
}

int ds18b20_read_temp()
{
    uchar TL, TH;
    int temp;

    ds18b20_init();
    ds18b20_write_byte(0xcc);
    ds18b20_write_byte(0x44);
    ds_delay(100);
    ds18b20_init();
    ds18b20_write_byte(0xcc);
    ds18b20_write_byte(0xbe);
    TL = ds18b20_read_byte();
    TH = ds18b20_read_byte();
    temp = TH;
    temp <<= 8;
    temp |= TL;
    return temp;
}

void get_distance()
{
    TR0 = 1;
    trig = 1;
    delayms(10);
    trig = 0;

    while(!echo);

    TR0 = 1;
    while(echo)
    {
        TH0 = 0;
        TL0 = 0;
    }

    distance = (TH0 << 8) | TL0;
    distance /= 58;
}

void main()
{
    TMOD = 0x01;
    TH0 = 0;
    TL0 = 0;
    TR0 = 0;
    init();

    while(1)
    {
        temp = ds18b20_read_temp() >> 4;
        write_com(0x80);
        for(uchar i = 0; i < 12; i++)
            write_data(table[i]);

        write_com(0x86);
        write_data(temp / 10 + '0');
        write_data(temp % 10 + '0');
        write_data('C');
        get_distance();
        write_com(0xc0);

        for(uchar i = 0; i < 10; i++)
            write_data(table1[i]);

        write_com(0xc9);
        write_data(distance / 10 + '0');
        write_data(distance % 10 + '0');
        write_com(0xcd);

        if(temp > 25 || distance < 10)
        {
            if(flag == 0)
            {
                flag = 1;
                write_data('!');
                write_com(0x8d);
                for(uchar i = 0; i < 18; i++)
                    write_data(table3[i]);

                beep = 1;
                delayms(500);
                beep = 0;
            }
        }
        else
        {
            if(flag == 1)
            {
                flag = 0;
                write_data(' ');
                write_com(0x8d);
                for(uchar i = 0; i < 6; i++)
                    write_data(table4[i]);
            }
        }

        delayms(500);
    }
}

在程序中，我们通过DS18B20读取温度值，通过HD-SR04读取距离值，并将它们显示在1602液晶显示屏上。如果温度值大于25℃或者距离小于10cm，就让蜂鸣器发出声音或者驱动步进电机运动。

最后，你需要将程序下载到51单片机上，并在Proteus中运行仿真，就可以看到效果了。