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[SIZE=2]
#include <avr/io.h>
#include <util/delay.h>
int Read_ADC(void);
int Read_ADC(void)
{
ADCSRA|=_BV(ADSC); //start conversion
while(!(ADCSRA&(1<<ADIF))); // wait for conversion done, ADIF flag active
ADCSRA|=(1<<ADIF);
return ADCH;
}
void main()
{
DDRD=0xff;
DDRB=0xff;
unsigned char j,k;
unsigned char i,a,b,c,d,e,f,g,h,w,x,y,z; // variables to store different temperature readings we need to sample
ADMUX=0; //SELECTING CHANNEL0
ADMUX|=_BV(ADLAR)|_BV(REFS1)|_BV(REFS0);// RFS1 and RFS0 are for Internal Reference voltage of 2.56V AND 8 BIT CONVERSION
ADCSRA=(1<<ADEN)|(1<<ADPS1)|(1<<ADPS0); //normal conversion without interrupt
while(1)
{
a=Read_ADC();
b=Read_ADC();
c=Read_ADC();
d=Read_ADC();
e=Read_ADC();
f=Read_ADC();
g=Read_ADC();
h=Read_ADC();
w=Read_ADC();
x=Read_ADC();
y=Read_ADC();
z=Read_ADC();
i=(a+b+c+d+e+f+g+h+w+x+y+z)/12; // give 1 degree lesser than the original one so I use the expression given below in blue
i=((a+b+c+d+e+f+g+h+w+x+y+z)/12)+1; // now original is displayed
if(i%10==0)
j=0x3f; // Displays 0 on units place
else if(i%10==1)
j=0x0c; // Displays 1 on units place
else if(i%10==2)
j=0x5b; // Displays 2 on units place
else if(i%10==3)
j=0x5e; // Displays 3on units place
else if(i%10==4)
j=0x6c; // Displays 4 on units place
else if(i%10==5)
j=0x76;
else if(i%10==6)
j=0x77;
else if(i%10==7)
j=0x1c;
else if(i%10==8)
j=0x7f;
else if(i%10==9)
j=0x7e; // Displays 9 on units place
PORTB=0xfd; // Pull down PB1 to active unit place digit
PORTD=j; // Displays the respective digit on units place
_delay_ms(6); // Provides delay to multiplexed the seven segment display
if(10>i&&i>=0)
k=0x3f; // Displays 0 on tenths place
else if(20>i&&i>=10)
k=0x0c; // Displays 1 on tenths place
else if(30>i&&i>=20)
k=0x5b; // Displays 2 on tenths place
else if(40>i&&i>=30)
k=0x5e;
else if(50>i&&i>=40)
k=0x6c;
else if(60>i&&i>=50)
k=0x76;
else if(70>i&&i>=60)
k=0x77;
else if(80>i&&i>=70)
k=0x1c;
else if(90>i&&i>=80)
k=0x7f; // Displays 9 on tenths place
PORTB=0xfe; // Pull down PB0 to active tenths place digit
PORTD=k; // Displays the respective digit on tenths place
_delay_ms(6); // Provides delay to multiplexed the seven segment display
}
} [/SIZE]
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