51 MCU + DHT11 temperature control program - can set temperature value

sbit key_1=P0^1; //Confirm key
sbit key_2=P0^2; //Key addition
sbit key_3=P0^3; //Key subtraction
Download the header file 12c5a.h used in this program: http://www.51hei.com/f/12c5a.rar
#include "12c5a.H"
#include "intrins.h"

unsigned char code num[]={"0123456789"};//Display character storage
unsigned char code start_char[]={"Loading...."};
unsigned char code t_char[]={"NOW TEMP IS"};
unsigned char *pnum=num;
unsigned int bbb,ccc,temp,temp_high,temp_low;

 
#define ADC_POWER 0x80 //ADC power control bit 
#define ADC_FLAG 0x10 //ADC complete flag 
#define ADC_START 0x08 //ADC start control bit 
#define ADC_SPEEDLL 0x00 //540 clocks 
#define ADC_SPEEDL 0x20 //360 clocks 
#define ADC_SPEEDH 0x40 / /180 clocks 
#define ADC_SPEEDHH 0x60 //90 clocks

sbit RS=P3^4; //Data command selection terminal
sbit RW=P3^5; //Read and write control terminal
sbit E=P3^6; //Enable signal control terminal
//sbit key_0=P0^0; //Set button
sbit key_1=P0^1; //Confirm button
sbit key_2=P0^2; //Key addition
sbit key_3=P0^3; //Key subtraction
sbit P04=P0^4;
sbit P05=P0^5;
sbit P06=P0^6;

void key_temphigh();
void key_templow();
void key_scan();
void delay_1602(unsigned int a);
void init_1602(void);
void WR_data_1602(unsigned char adata,unsigned char i);
void process(unsigned int shuju);

 void Delay(unsigned char n)                           
{                                                         
     int x;
  while (n--)                                  
     {
   x = 500;
   while (x--);
   }
}

void init_ADC(void)
{
 P1ASF=0xFF;
 ADC_RES = 0;
 ADC_RESL = 0;                                       
 ADC_CONTR = 0x88;
 Delay(2);  
}

unsigned int GetResult(void) 
{ 
 unsigned char m,n;
 unsigned int aaa;
    init_ADC();
    while (!(ADC_CONTR & ADC_FLAG)); //Wait complete flag 
    ADC_CONTR =0x80; //Close ADC 
 m=ADC_RES;
 n= ADC_RESL;                    
    aaa=m*4+n;
 return aaa;
}     
void start_init(void)
{
 unsigned char i;
  WR_data_1602(0x80,0); //Displayed in the first line
 for(i=0;i<11;i++)  
  WR_data_1602(start_char[i],1);
 delay_1602(20);
 init_ADC();
 temp=GetResult()*5.0;
 WR_data_1602(0x80,0); //Displayed in the first line
 for(i=0;i<11 ;i++)  
  WR_data_1602(t_char[i],1);  
}

void delay_1602(unsigned int a) //Delay
{
 unsigned int i,j,k;
 for(i=0;i   for(j=0;j<106;j++)
   for(k=0; k<100;k++);
}

[page]
void key_temphigh() // Temperature upper limit judgment
 { if(key_2==0) //Add judgment
    { Delay(3);
        if(key_2==0)
       { while(!key_2);
      temp_high+=5;
      if(temp_high==995)
      {temp_high=5;}
       }
    }
   if(key_3==0) //Subtract judgment
      { Delay(3);
        if(key_3==0)
       { while(!key_3); //Wait for
          releasetemp_high-=5; //The upper limit alarm temperature decreases by 0.5 each time
       if(temp_high==0)
        {temp_high=990;}
       }
      }
    }

void key_templow() // Temperature lower limit judgment
 { if(key_2==0) //Add judgment
    { Delay(3);
        if(key_2==0)
       { while(!key_2);
      temp_low+=5;
      if(temp_low==995)
      {temp_low=5;}
       }
    }
   if(key_3==0) //Subtract judgment
      { Delay(3);
        if(key_3==0)
       { while(!key_3); //Wait for release
          temp_low-=5; // The upper limit temperature decreases by 0.5 each time
       if(temp_low== 0)
        {temp_low=990;}
       }
      }
    }

void key_scan()
  { unsigned char nm=0,k;
     if(key_1==0) //Detect the setting button and determine whether to set it
      { if(key_1==0)
    { Delay(100);
     while(!key_1);
       k=1;nm++;
     }
    } 
   while(k) //Enter the adjustment interface,
   { if(key_1==0)
       { Delay(3);
       if(key_1==0)
     { while(!key_1);
        nm++; //Which parameter to adjustif
     (nm==4){nm=1;}
      }
     }
    switch(nm) //Select the object to be adjusted
      { case 1:WR_data_1602(0xc0,0);WR_data_1602('H',1);process(temp_high);key_temphigh();break;
     case 2:WR_data_1602(0xc0,0);WR_data_1602('L',1);process(temp_low);key_templow();break;
     case 3:WR_data_1602(0xc0,0);WR_data_1602(' ',1);process(temp);nm=0;k=0;break;
     default :break;
     }
  
 /* if(key_1==0) //OK and Exit
     {Delay(3);
       if(key_1==0)
      {while(!key_1);
        nm=0;k=0;WR_data_1602(0xc1,0);process(temp);
       }
    } */
       if(k==0)
   {continue;}//End loop 
    }
  }

 void baojing()
   {
   if(temp>temp_high-5) {P04=1;P05=0;P06=1;} // Upper limit 25
      else if(temp          else {P04=1;P05=1;P06=0;}
      } 

void init_1602(void) //Initialization
{
 WR_data_1602(0x38,0);
 WR_data_1602(0x01,0);
 WR_data_1602(0x06,0);
 WR_data_1602(0x0c,0);
}

void WR_data_1602(unsigned char adata,unsigned char i) //write data i=1,write instruction i=0
{
 P2=adata;
 RS=i;
 RW=0;
 E=1;
 delay_1602(1);
 E=0;
 RW=1;
 RS=0;  
}

void process(unsigned int shuju) //Display data processing
{
 unsigned int a,b,c,d;
 a=shuju/1000;
 b=(shuju%1000)/100;
 c=(shuju%100)/10;
 d =shuju%10;
 if(a==0&&b!=0){WR_data_1602(0xc2,0);
 WR_data_1602(*(pnum+b),1);
 WR_data_1602(*(pnum+c),1);
 WR_data_1602(' .',1); 
 WR_data_1602(*(pnum+d),1);
 WR_data_1602('C',1);}
 if(a==0&&b==0){WR_data_1602(0xc2,0); 
 WR_data_1602(*(pnum+c),1);
 WR_data_1602('.',1); WR_data_1602 
 (*(pnum+d),1);
 WR_data_1602('C',1);
 WR_data_1602(' ',1); }
 //WR_data_1602(0xc1,0); //Displayed in the second line
 //WR_data_1602(' ',1);
 //WR_data_1602(*(pnum+a),1);
// WR_data_1602(*(pnum+b ),1);
 //WR_data_1602(*(pnum+c),1);
// WR_data_1602('.',1); 
// WR_data_1602(*(pnum+d),1);
// WR_data_1602('C ',1);
 
 delay_1602(1);  
}

void main() //Main function
{
 unsigned int mm;
 init_1602(); //Initialization
 start_init();
 mm=GetResult();
 temp_high=250;
 temp_low=90;
 while(1)
 { 
  key_scan();
     baojing() ;
  ccc=GetResult();
  temp=ccc*5.0;
  process(temp);
  delay_1602(10); 
 }
}