[dinhnambkhn]

đây là code của chương trình!
code[

// Mo ta phan cung : Dung PIC16F877A - thach anh 20MHz
// : Led7seg giao tiep voi PORTD
// : Dau ra LM335 dua vao chan AN0
//----------------------------------------------------------------
// Chu thich :
// : dung che do Power On Reset
// : chuong trinh tham khao cua anh linhnc308
//================================================= =======
#include <16F877A.h>
#include <def_877a.h>
#device *=16 adc=10
#FUSES NOWDT, HS, NOPUT, NOPROTECT, NODEBUG, NOBROWNOUT,NOLVP, NOCPD, NOWRT
#use delay(clock=20000000)
#define speak PIN_A1
#use fast_io(d)
#byte portd=0x8
int8 low,high,min,max,i,j,low1,high1;
int1 do_F;
void convert_bcd(int8 x);
const char led7seg[12]={0xC0,0xcf,0xa4,0xb0,0x99,0x92,0x83,0xf8,0x80,0x9 0,0x8e,0xc6};
const char quet[3]={0b00100000,0b01000000,0xb10000000};
#INT_EXT
void test()
{
if (do_F == 1) do_F=0;
else do_F=1;
}
//-----------------------------------------------------------------
void main()
{

float value;
min =15; //nhiet do min
max =35; //nhiet do max
do_F =0 ;
i = 10 ;
set_tris_d(0);
trisa = 0xFF;
trisb = 0x01;
trisc=0x00;
portd=0xff;
output_low(speak);
//==== Khoi tao cho ngat ngoai============================================= ==
enable_interrupts (INT_EXT);
ext_int_edge(H_TO_L);
enable_interrupts (GLOBAL);
//=========== Khoi tao che do cho bo ADC=====================================
setup_adc_ports(AN0);
setup_adc(ADC_CLOCK_INTERNAL);

delay_us(10);// Lay mau nhiet do lan dau tien
value=(float)read_adc();
value = (value - 558.5)/2.048; // For 5V supply
// value = (value - 754.8)/2.048; // For 3.7V Supply
// value = (value - 698.2)/2.048; // For 4V supply
convert_bcd((int8)value); // Tach so tram, chuc, donvi de hien thi len LED 7
delay_ms(500);
while(1)
{
if (i==10)
{
value = read_adc();
value=(value-558.5)/2.048;

if (do_F==1)
value=1.8*value+32;
convert_bcd((int8)value);


if (do_F==0)
{
for(j=0;j<25;j++);
{
PORTD=led7seg[high1];
portc=quet[0];
delay_us(100);
portd=0xff;
delay_us(30);

Portd=led7seg[low1];
portc=quet[1];
delay_us(100);
portd=0xff;
delay_us(30);

portd=led7seg[11];
portc=quet[2];
delay_us(100);
portd=0xff;
delay_us(30);
}
}

if (do_F==1)
{
for(j=0;j<25;j++);
{
PORTD=led7seg[high1];
portc=quet[0];
delay_us(100);
portd=0xff;
delay_us(30);

Portd=led7seg[low1];
portc=quet[1];
delay_us(100);
portd=0xff;
delay_us(30);

portd=led7seg[10];
portc=quet[2];
delay_us(100);
portd=0xff;
delay_us(30);
}
}
i=0;
}
if( ( (int8)value > max ) || ( (int8)value < min) )
{
output_high(speak);
}
i++;
}
}
//The End=============================================== ========================
void convert_bcd(int8 x)
{
low1=x%10; //chia lay phan du, so hang don vi
high1=x/10; //tach hang tram va hang chuc
low = low + 0x30;
high = high + 0x30;
}
]