51 single chip microcomputer + max6675 to collect thermocouple temperature

51 MCU uses max6675 to collect thermocouple temperature and has been debugged successfully with circuit

The microcontroller source program is as follows:

#include "include.h"

#include "12864.h"

unsigned int i,j; 

unsigned char Flag_connect;

unsigned int MAX6675_Temp;

/********************************************************************     

/********************************************************************

                            Main function

*********************************************************************/

int max6675();

void InitTimer0(void);

void main()                                                                                                                                                                                            

{ 

        unsigned int t;

    InitTimer0();

         Ini_Lcd(); //Initialize LCD

          Write_Str ( 0, 0, "温度:    " );        

        //        unsigned char cnt = 11;

while(1)

{ 

             t=MAX6675_ReadReg();

                  Flag_connect=t&0x04; //The D2 bit of the read data is the thermocouple disconnection flag bit. If it is 1, it is disconnected, and if it is 0, it is connected.

                  Flag_connect=Flag_connect>>2; //Is MAX6675 online?

                t = t<<1; //D3~D14 of the read data are temperature values

                t = t>>4;

                MAX6675_Temp = t/4; //The measured temperature unit is 0.25, so you need to multiply by 0.25 (i.e. divide by 4) to get the temperature value in degrees

                for(t=0; t<200; t++) //Display temperature

                {  

                if(Flag_connect==0)

                LCD_DispDec ( 4, 0,MAX6675_Temp, 3, 0 );

                }

}

}

void Timer0Interrupt(void) interrupt 1

{        

        TF0=0;

  TH0=0xfc;

  TL0=0x18;

        i++;

         if(i==500)

        {  i=0;

      Key_Flag = 1;

         }

}

void InitTimer0(void)

{

    TMOD = 0x01;

    TH0 = 0xfc;

    TL0 = 0x18;

    ET0 = 1;

    TR0 = 1; 

         EA = 1;

……………………15:24 2020-2-24