單片機DS18B20 DHT11溫控風扇程序與Proteus仿真帶PID

ID:1105344 · 發表于 2023-12-20 13:44

利用51單片機和溫度傳感器DS18B20和濕度傳感器DHT11，STC89C52R作為處理器，通過單總線將采集數據實時顯示于本地LCD顯示屏端。用電機風扇轉速，溫度控制風扇調整高時風扇轉速加快，溫度低時風扇轉速減小,濕度高時風扇轉速加快，濕度低時風扇轉速減小。四個按鍵分別控制：切換控制溫度/濕度；增大要控制的溫度/濕度的標準；減小要控制的溫度/濕度的標準；切換控制方式（PID算法/檔位）。

仿真原理圖如下（proteus仿真工程文件可到本帖附件中下載）

單片機程序

#include <REG52.H>
#include "intrins.h"
#include "LCD1602.h" //包含LCD1602頭文件
#include "Delay.h" //包含Delay頭文件
#include "DS18B20.h"
#include "DHT11.h"
#include "Timer0.h"
sbit Motor=P0^0;
sbit P34 = P3^4;
sbit P35 = P3^5;
sbit P36 = P3^6;
sbit P37 = P3^7;
float T = 0;
extern unsigned char hum;//濕度
unsigned char k1 = 5, k2 = 1, k3 = 10;
int sbz = 38, speed = 0, wbz = 25;
float bz = 0, xz = 0;
float p = 0,i = 0,d = 0;
float pid = 0;
int Compare = 0;
unsigned char DHTC = 0,DHTF = 0;
unsigned char sw = 0; //0濕度， 1溫度
unsigned char kz = 0; //0檔位控制, 1pid
unsigned char key = 0, key_keyNumber = 0;
void main()
{
Motor = 0;
LCD_Init();
DHT11_Init();
DS18B20_ConvertT();
Delay(1000);
Timer0Init();
Timer1Init();
TR0 = 1; //定時器0開始計時
ET0=1;
TR1 = 1;
ET1 = 1;
EA=1;//開啟總中斷
while(1)
{
LCD_ShowString(1,1,"Tem:");
LCD_ShowString(2,1,"Hum:");
LCD_ShowChar(1,8,'.');
LCD_ShowChar(2,7,'%');
TR0 = 0;
TR1 = 0;
DS18B20_ConvertT(); //轉換溫度
T=DS18B20_ReadT(); //讀取溫度
if(DHTF == 1)
{
DHT11_receive();
DHTF = 0;
}
TR0 = 1;
TR1 = 1;
LCD_ShowNum(1,5,T,3); //顯示溫度整數部分
LCD_ShowNum(1,9,(unsigned long)(T*10000)%10000,4);//顯示溫度小數部分
LCD_ShowNum(2,5,hum,2);
//LCD_ShowNum(1,5,Compare,4);
//LCD_ShowNum(1,10,hu,2);LCD_ShowSignedNum(2,1,p,4);LCD_ShowSignedNum(2,6,i,4);LCD_ShowSignedNum(2,11,d,4);
key = key_keyNumber;
key_keyNumber = 0;
{
if(key == 1)
{
sw = 1 - sw;
}
else if(key == 2)
{
if(sw == 0)
sbz++;
else
wbz++;
}
else if(key == 3)
{
if(sw == 0)
sbz--;
else
wbz--;
}
else if(key == 4)
{
kz = 1 - kz;
}
}
if(sw == 1)
{
LCD_ShowNum(1,14,wbz,3);
LCD_ShowString(2,14," ");
xz = T;
bz = wbz;
}
else
{
LCD_ShowNum(2,14,sbz,3);
LCD_ShowString(1,14," ");
xz = hum;
bz = sbz;
}
if(kz)
{
LCD_ShowString(2,10,"PID");
d = xz - bz - p;
p = xz - bz;
i += p;
pid += (k1*p + k2*i + k3*d);
if(pid>=0 && pid<=1000)
{
Compare = pid;
}
else if(pid<0)
{
Compare = 0;
pid = 0;
}
else
{
Compare = 1000;
pid = 1000;
}
}
else
{
LCD_ShowString(2,10," ");
p = 0;i = 0; d = 0; pid = 0;
if(xz - bz >=10)
{
speed = 1000;
}
else if(xz - bz <=0)
{
speed = 0;
}
else
{
speed = (int)((xz - bz)*100);
}
Compare = speed ;
}
Delay(50);
}
}
unsigned char Key_GetState()
{
unsigned char keynum = 0;
if(P34 == 0){keynum=1;} //一有按鍵被按下，標志位keynum立即置位并返回，給key_loop函數處理
if(P35 == 0){keynum=2;}
if(P36 == 0){keynum=3;}
if(P37 == 0){keynum=4;}
return keynum;
}
void key_loop()
{
static unsigned char before_state,now_state;
before_state = now_state;
now_state = Key_GetState(); //獲取按鍵標志位
if(before_state == 1 && now_state == 0)
{
key_keyNumber = 1; //全局變量key_keyNumber置1，使用key_return函數返回給main函數使用
}
if(before_state == 2 && now_state == 0)
{
key_keyNumber = 2;
}
if(before_state == 3 && now_state == 0)
{
key_keyNumber = 3;
}
if(before_state == 4 && now_state == 0)
{
key_keyNumber = 4;
}
}
void Timer0_Routine() interrupt 1
{
static unsigned int T0Count;
TL0 = 0xA4; //設置定時初始值
TH0 = 0xFF;
T0Count++;
if(T0Count < Compare)
{
Motor = 1;
}
else
{
Motor = 0;
}
if (T0Count >= 1000)
{
T0Count = 0;
}
}
void Timer1_Routine() interrupt 3
{
static unsigned int T1Count;
TL1 = 0x00;
TH1 = 0xDC;
T1Count++;
DHTC ++;
if(T1Count>=20)
{
key_loop();
T1Count = 0;
}
if(DHTC >=75)
{
DHTC = 0;
DHTF = 1;
}
}

復制代碼

Proteus8.13仿真程序下載:

仿真代碼 keil文件.7z (79.93 KB, 下載次數: 109)

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單片機DS18B20 DHT11溫控風扇程序與Proteus仿真帶PID

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單片機DS18B20 DHT11溫控風扇程序與Proteus仿真 帶PID

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單片機DS18B20 DHT11溫控風扇程序與Proteus仿真帶PID