//Program to make a digital thermometer with display in centigrade scale
#include<reg51.h>
#define port P3
#define adc_input P1
#define dataport P0
#define sec 100
sbit rs = port^0;
sbit rw = port^1;
sbit e = port^2;
sbit wr= port^3;
sbit rd= port^4;
sbit intr= port^5;
int test_intermediate3=0, test_final=0,test_intermediate1[10],test_intermediate2[3]={0,0,0};
void delay(unsigned int msec )
{
int i ,j ;
for(i=0;i<msec;i++)
for(j=0; j<1275; j++);
}
void lcd_cmd(unsigned char item) //Function to send command to LCD
{
dataport = item;
rs= 0;
rw=0;
e=1;
delay(1);
e=0;
return;
}
void lcd_data(unsigned char item) //Function to send data to LCD
{
dataport = item;
rs= 1;
rw=0;
e=1;
delay(1);
e=0;
//delay(100);
return;
}
void lcd_data_string(unsigned char *str) // Function to send string to LCD
{
int i=0;
while(str!=’ ’)
{
lcd_data(str);
i++;
delay(10);
}
return;
}
void shape() // Function to create the shape of degree
{
lcd_cmd(64);
lcd_data(2);
lcd_data(5);
lcd_data(2);
lcd_data(0);
lcd_data(0);
lcd_data(0);
lcd_data(0);
lcd_data(0);
}
void convert() // Function to convert the values of ADC into numeric value to be sent to LCD
{
int s;
test_final=test_intermediate3;
lcd_cmd(0xc1);
delay(2);
lcd_data_string(“TEMP:”);
s=test_final/100;
test_final=test_final%100;
lcd_cmd(0xc8);
if(s!=0)
lcd_data(s+48);
else
lcd_cmd(0x06);
s=test_final/10;
test_final=test_final%10;
lcd_data(s+48);
lcd_data(test_final+48);
lcd_data(0);
lcd_data(‘c’);
lcd_data(‘ ‘);
delay(2);
}
void main()
{
int i,j;
adc_input=0xff;
lcd_cmd(0x38);
lcd_cmd(0x0c); //Display On, Cursor Blinking
delay(2);
lcd_cmd(0x01); // Clear Screen
delay(2);
while(1)
{
for(j=0;j<3;j++)
{
for(i=0;i<10;i++)
{
delay(1);
rd=1;
wr=0;
delay(1);
wr=1;
while(intr==1);
rd=0;
lcd_cmd(0x88);
test_intermediate1=adc_input/10;
delay(1);
intr=1;
}
for(i=0;i<10;i++)
test_intermediate2[j]=test_intermediate1+test_intermediate2[j];
}
test_intermediate2[0]=test_intermediate2[0]/3;
test_intermediate2[1]=test_intermediate2[1]/3;
test_intermediate2[2]=test_intermediate2[2]/3;
test_intermediate3=test_intermediate2[0]+test_intermediate2[1]+test_intermediate2[2];
shape();
convert();
}
}