วงจรเซ็นเซอร์อุณหภูมิแบบดิจิตอล

วงจรเซ็นเซอร์อุณหภูมิแบบดิจิตอล

ส่วนประกอบที่จำเป็น

• AT89C51 (8051 Microcontroller)
• 11.0592 MHz Cystal
• 2 X 33pF Capacitor
• 10μF/16V Capacitor
• 3 X 10KΩ Resistor
• 1KΩ x 8 Resistor Pack
• 10KΩ POT
• 16X2 LCD Display
• ADC0804
• LM35
• 150pF Capacitor
• 330Ω Resistor
• Power Supply
• Connecting Wires
• 8051 Programmer

Code

#include<reg51.h>

#define lcd P0

#define dat P3

sbit rs=P2^0;

sbit e=P2^1;

void delay (int);

void display (unsigned char);

void cmd (unsigned char);

void init (void);

void string (char *);

void intro (void);

unsigned char degree[8]={0x0e,0x0a,0x0e,0x00,0x00,0x00,0x00,0x00};

char i=0;

void delay (int d)

{

unsigned char i=0;

for(;d>0;d--)

{

for(i=250;i>0;i--);

for(i=248;i>0;i--);

}

}

void cmd (unsigned char c)

{

lcd=c;

rs=0;

e=1;

delay(10);

e=0;

}

void display (unsigned char c)

{

lcd=c;

rs=1;

e=1;

delay(10);

e=0;

}

void string (char *c)

{

while(*c)

{

display(*c++);

}

}

void init (void)

{

cmd(0x38);

cmd(0x01);

  cmd(0x0c);

cmd(0x80);

}

void intro (void)

{

string("  Electronics  ");

cmd(0xc0);

string("      Hub      ");

delay(1000);

cmd(0x01);

string("    Digital    ");

cmd(0xc0);

string("  Thermometer  ");

delay(1000);

cmd(0x01);

cmd(0x40);

for(i=0;i<8;i++)

display(degree[i]);

  i=0;

cmd(0x80);

}

void main()

{

unsigned int val=0;

unsigned int temp=0;

init();

intro();

dat=0xff;

while(1)

{

if(i==0)

{

string("Temp: ");

i++;

}

val=dat*1.953;

cmd(0x86);

temp=(((val/10)%10)+48);

display(temp);

temp=((val%10)+48);

display(temp);

    if(i==1)

{

display(0);

string("C");

i++;

}

delay(300);

}

while(1);

}

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