Electronic thermometer 1602 LCD display or digital tube display-EEWORLD

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#include

#define uchar unsigned char

#define uint unsigned int

sbit DS=P2^2; //define interface

uint temp; // variable of temperature

uchar flag1; // sign of the result positive or negative

sbit dula=P2^6;

sbit temperature=P2^7;

sbit beep=P2^3;

//unsigned char code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,

// 0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};

//unsigned char code table1[]={0xbf,0x86,0xdb,0xcf,0xe6,0xed,0xfd,

// 0x87,0xff,0xef};

sbit lcden=P3^4; //LCD en port

sbit lcdrs=P3^5; // LCD RS port

void delay(uint count) //delay

{

uint i;

while(count)

{

i=200;

while(i>0)

i--;

count--;

}

void dsreset() //DS18B20 reset

{

uint i;

DS=0;

i=103;

while(i>0)i--;

DS=1;

i=4;

while(i>0)i--;

}

bit tmpreadbit() //DS18B20 reads one bit repeatedly

{

uint i;

bit that;

DS=0;i++; //i++ is used for delay

DS=1;i++;i++;

dat=DS;

i=8;while(i>0)i--;

return (that);

}

uchar tmpread() //DS18B20 reads one byte repeatedly

{

flying i,j,dat;

that=0;

for(i=1;i<=8;i++)

{

j=tmpreadbit();

dat=(j<<7)|(dat>>1); //The lowest bit of the read data is at the front, so there is exactly one byte in DAT

}

return(that);

}

void tmpwritebyte(uchar dat) //DS18B20 writes one byte to the microcontroller

{

uint i;

flying j;

bit testb;

for(j=1;j<=8;j++)

{

testb=that&0x01;

that=that>>1;

if(testb) //write 1

{

DS=0;

i++;i++;

DS=1;

i=8;while(i>0)i--;

}

else

{

DS=0; //write 0

i=8;while(i>0)i--;

DS=1;

i++;i++;

}

void tmpchange() //DS18B20 data conversion

{

dsreset(); // reset

delay(1);

tmpwritebyte(0xcc);

tmpwritebyte(0x44); // Start temperature conversion instruction

}

uint tmp() //Get temperature value

{

float tt;

fly a,b;

dsreset();

delay(1);

tmpwritebyte(0xcc);

tmpwritebyte(0xbe);

a=tmpread();

b=tmpread();

temp=b;

temp<<=8; //Two 8-bit bytes are combined into a 16-bit integer data

temp=temp|a;

tt=temp*0.0625;

temp=tt*10+0.5;

return temp;

}

void write_com(uchar com) // sub-function with a parameter, this section is the write instruction sub-function

{

lcdrs=0; //write data when rs=1, write instructions when rs=0

P0=com; //send command

delay(5); //When EN=1 sends a high pulse, delay TSP1 time after the instruction and rs (see chip timing diagram for LCD)

lcden=1; //EN high pulse, start sending data

delay(5); //High level lasts for TPW time

lcden=0; // Pull the level down continuously

}

void write_data(uchar date) // sub-function with a parameter, this section is the sub-function for writing data

{

lcdrs=1; //write data when rs=1, write instructions when rs=0

P0=date; //send command

delay(5); //When EN=1 sends a high pulse, delay TSP1 time after the instruction and rs (see chip timing diagram for LCD)

lcden=1; //EN high pulse, start sending data

delay(5); //High level lasts for TPW time

lcden=0; // Pull the level down continuously

}

void write_1602(uchar add,uchar dat) //Put the two sub-functions of writing instructions and writing data into a total 1602 function for easy calling

{

write_com(0x80+0x40+add); //Write instruction, that is, write an address to write data, specify the address to write data

write_data(dat); //Write data, write what you want to write

}

void init()//initialization function

{

game=0;

temperature=0;

lcden=0; //Because data is read and written only when EN is high pulse, so initialize EN=0

write_com(0x38);

write_com(0x0c); //LCD initialization display mode setting, call sub-function, write in the initialization instruction code to set its function

write_com(0x06); //After writing a character, the cursor address increases by 1

write_com(0x80); //The address pointer points to the first position of the first line

write_com(0x01); //initialize and clear the screen

}

void display(uint temp) //display program

{

uchar A1,A2,A2t,A3;

A1=temp/100;

A2t=temp0;

A2=A2t/10;

A3=A2t;

write_1602(1,A1+0x30);

write_1602(2,A2+0x30);

write_1602(3,0x2e);

write_1602(4,A3+0x30);

write_1602(6,'C');

}

void main()

{

flying a;

heat();

while(1)

{

tmpchange();

for(a=10;a>0;a--)

{

display(tmp());

}

if(temp>=310) //When the temperature exceeds 31 degrees (for testing only, it can be set to a higher value), the buzzer will sound an alarm.

{

P1=0x00;

beep=0;

}

else

{

beep=1;

P1=0xff;

}

Reference address：Electronic thermometer 1602 LCD display or digital tube display

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