2021年12月07日 | 基于51单片机DHT11的加湿器proteus仿真程序设计

硬件设计

仿真图：由LCD1602作为显示器，温湿度采用DHT11，通过3个按键设置阈值，当温湿度超过上下限之后会触发分别的继电器；

程序设计

#include "common.h"

#include "lcd1602.h"

#include "dht.h"

extern unsigned char U8RH_data_H;

extern unsigned char U8T_data_H;

sbit key1 = P1^0;//设置键

sbit key2 = P1^1;//加键

sbit key3 = P1^2;//减键

sbit relay1 = P1^6;//加热继电器

sbit relay2 = P1^7;//降温继电器

sbit relay3 = P3^6;//加湿继电器

sbit relay4 = P3^7;//除湿继电器

sbit beep = P2^0;//蜂鸣器

unsigned char tl = 10,th = 35,hl = 15,hh = 70;//温湿度上下限初始值

unsigned char setn = 0;//设置标志

void display_alarm()//显示报警值

{

  lcd_write_char(4,0,tl/10+0x30);

lcd_write_char(5,0,tl%10+0x30);

lcd_write_char(13,0,th/10+0x30);

lcd_write_char(14,0,th%10+0x30);

lcd_write_char(4,1,hl/10+0x30);

lcd_write_char(5,1,hl%10+0x30);

lcd_write_char(13,1,hh/10+0x30);

lcd_write_char(14,1,hh%10+0x30);

}

void keyscan()

{

  if(key1 == 0)//设置键按下

{

delay_ms(10);

if(key1 == 0)

{

beep = 0;

delay_ms(100);

beep = 1;

while(key1 == 0);//等待按键松开

setn++;

if(setn > 4)//按下次数超过4次，退出设置

{

setn = 0;

lcd_write_com(0x0c);//关闭光标

lcd_write_str(0,0,"Tem:  C  Hum:  %");

  lcd_write_str(0,1,"                ");

}

if(setn == 1)//设置温度下限

{

lcd_write_str(0,0,"Tml:  C  Tmh:  C");

  lcd_write_str(0,1,"Hml:  %  Hmh:  %");

display_alarm();

lcd_write_com(0x80+5);

lcd_write_com(0x0f);

}

if(setn == 2)//温度上限

{

lcd_write_com(0x80+14);

lcd_write_com(0x0f);

}

if(setn == 3)//湿度下限

{

lcd_write_com(0x80+0x40+5);

lcd_write_com(0x0f);

}

if(setn == 4)//湿度上限

{

lcd_write_com(0x80+0x40+14);

lcd_write_com(0x0f);

}

}

}

if(key2 == 0)//加键按下

{

delay_ms(10);

if(key2 == 0)

{

beep = 0;

delay_ms(100);

beep = 1;

while(key2 == 0);

    if(setn == 1)

{

if(th - tl > 1)//上限必须大于下限，下限才能加

tl ++;

display_alarm();

lcd_write_com(0x80+5);

lcd_write_com(0x0f);

}

if(setn == 2)

{

    if(th < 99)//最大到99

th++;

display_alarm();

lcd_write_com(0x80+14);

lcd_write_com(0x0f);

}

if(setn == 3)

{

    if(hh - hl > 1)//上限必须大于下限，下限才能加

hl++;

display_alarm();

lcd_write_com(0x80+0x40+5);

lcd_write_com(0x0f);

}

if(setn == 4)

{

    if(hh < 99)//最大到99

hh++;

display_alarm();

lcd_write_com(0x80+0x40+14);

lcd_write_com(0x0f);

}

}

}

if(key3 == 0)//减键按下

{

delay_ms(10);

if(key3 == 0 )

{

beep = 0;

delay_ms(100);

beep = 1;

while(key3 == 0);

if(setn == 1)

{

if(tl > 0)//最小到0

tl --;

display_alarm();

lcd_write_com(0x80+5);

lcd_write_com(0x0f);

}

if(setn == 2)

{

    if(th - tl > 1)//上限必须大于下限，上限才能减

th--;

display_alarm();

lcd_write_com(0x80+14);

lcd_write_com(0x0f);

}

if(setn == 3)

{

    if(hl > 0)

hl--;

display_alarm();

lcd_write_com(0x80+0x40+5);

lcd_write_com(0x0f);

}

if(setn == 4)

{

    if(hh - hl > 1)//上限必须大于下限，上限才能减

hh--;

display_alarm();

lcd_write_com(0x80+0x40+14);

lcd_write_com(0x0f);

}

}

}

}

文件仅供参考：

链接：https://pan.baidu.com/s/1ZMBRq-beQdIIprV4pZcopA

提取码：e2xw