Write your own keilc program, and PROTEUS built a simple temperature measurement circuit, found with the LCD1602 display temperature and the difference of thermocouple temperature 10 degrees, such as temperature to several baidu, error is reduced a little, but when the thermocouple temperature of 10 degrees, according to the temperature of 0 degrees or so, is this why? Ask ace to give directions

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 
MAX6675 test program 
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
#include  
# include "intrins. H"//_nop_ (); Delay function in 

# define uchar unsigned char 
# define uint unsigned int 


Sbit SO=P2 ^ 4;//P3.6 mouth connected with SO 
Sbit SCK=P2 ^ 5;//P3.4 mouth connected with SCK 
Sbit CS=P2 ^ 6;//P3.5 mouth is linked together with CS 

Sbit wx=P2 ^ 5;//?? 
Sbit dx=P2 ^ 6;//?? 

Const unsigned char DevID=1;//the native device ID 
Unsigned char buffer;//serial port receive buffer 
Unsigned char rcv_buffer [20]. 
Unsigned char send_buffer [20]. 
Unsigned char flag_ok=0;//receive over the identity of the 
Unsigned int MAX6675_Temp; 
Unsigned char Flag_connect; 
Unsigned char CRCH CRCL; 
Unsigned char wd [2].//wd [] : the temperature of the BCD code 
Unsigned char flag_dis;//display refresh the identity of the 

Unsigned char dis [4]={0 x00 to 0 x00 to 0 x00 to 0 x00}; 
Unsigned char code SMG []={xa4 xc0 0, 0 xf9, 0, 0, xb0 x99 0, 0 x92, 0 x82, 0 xf8, 0 x80, 0 x90, 0 x88, 0 x83, 0 xc6, 0 xa1, 0 x86, 0 x8e}; 



Unsigned char data disdata [5]. 
Int t_zhi=0; 
/* * * * * * * * * * * * * * * * * * * * *!!!!!!!!!! 1014 to modify!!!!!! 1 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
//temperature reading 
Unsigned int ReadMAX6675 ()//read from the MAX6675 temperature 
{
Unsigned char count; 
Unsigned int Value. 
CS=0;//buy low, enabling MAX6675 
SCK=0; 
Value=https://bbs.csdn.net/topics/0; 
_nop_ (); 
_nop_(); 
_nop_(); 
_nop_(); 
for(count=0; Count<16. Count++)//to get 16 MSB 
{
Value=https://bbs.csdn.net/topics/Value <1;//left 
SCK=1;//SCK buy high 
_nop_ (); 
_nop_(); 
_nop_(); 
_nop_(); 
If (SO==1)//get the current value 
The Value |=0 x01; 
SCK=0; 
} 
CS=1;//close MAX6675 
The return Value. 
} 

/* * * * * * * * * * * * * * * * * * * * * - millisecond delay function * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

Void DelayMs (unsigned int I)//a time delay function, the function in the 11.0592 M crystal vibration under the delay time is about 1 ms 
{
Unsigned int j, k; 
For (j=I; J> 0; J -) 
For (k=114; K> 0; K -); 
} 


/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 
LCD1602 DRIVER 

The File Name: LCD1602. H 
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

# # ifndef LCD_CHAR_1602_2009_6_28 
# define LCD_CHAR_1602_2009_6_28 

#include  
Sbit LcdRs=P2 ^ 0;//define port 
Sbit LcdRw=P2 ^ 1; 
Sbit LcdEn=P2 ^ 2; 
# define DBPort P1 


/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 
Wait functions within 
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
Unsigned char LCD_Wait (void) 
{
LcdRs=0; 
LcdRw=1; _nop_(); 
LcdEn=1; _nop_(); 

LcdEn=0; 
Return DBPort; 
} 
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 
To write command or LCD data 
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
//# define LCD_COMMAND 0 Command 
# define LCD_DATA 1//Data 
# define LCD_CLEAR_SCREEN 0 x01//clear screen 
# define LCD_HOMING 0 x02//the cursor to return to the origin 
Void LCD_Write (bit style, unsigned char input) 
{
LcdEn=0; 
LcdRs=style; 
LcdRw=0; _nop_(); 
DBPort=input; _nop_();//note order 
LcdEn=1; _nop_();//note order 
LcdEn=0; _nop_(); 
LCD_Wait (); 
} 

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 
Set the display mode 
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
# define LCD_SHOW 0 x04//show 
# define LCD_HIDE 0 x00//show off 

# define LCD_CURSOR 0 x02//show the cursor 
# define LCD_NO_CURSOR 0 x00//no cursor 

# define LCD_FLASH 0 x01//the cursor flashing 
# define LCD_NO_FLASH 0 x00//not flashing cursor 

Void LCD_SetDisplay unsigned char (an) 
{
LCD_Write (LCD_COMMAND, 0 x08 | an); 
} 

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 
Set the input mode 
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
# define LCD_AC_UP 0 x02 
# define LCD_AC_DOWN 0 x00//default 

# define LCD_MOVE 0 x01//picture can translation 
# define LCD_NO_MOVE 0 x00//default 

Void LCD_SetInput (unsigned char an InputMode) 
{
LCD_Write (LCD_COMMAND, 0 x04 | an InputMode); 
} 

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 
Initializes the LCD 
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
Void LCD_Initial () 
{
LcdEn=0; 
LCD_Write (x38 LCD_COMMAND, 0);//8 bits of data port, 2 rows, according to 5 * 7 lattice 
LCD_Write (x38 LCD_COMMAND, 0); 
LCD_SetDisplay (LCD_SHOW | LCD_NO_CURSOR);//open display, no cursor 
LCD_Write (LCD_COMMAND LCD_CLEAR_SCREEN);//clear screen 
LCD_SetInput (LCD_AC_UP | LCD_NO_MOVE);//AC increment, the picture is not moving 
} 

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 
The location of the liquid crystal character input 
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
Void GotoXY (unsigned char x, unsigned char y) 
{
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