#include <reg51.h>

#define ADC P2
#define LCD P1

sbit RS = P3^0;
sbit EN = P3^1;
sbit WR = P3^2;
sbit RD = P3^3;
sbit INTR = P3^4;

void delay()
{
    int i;
    for(i=0;i<30000;i++);
}

void cmd(char c)
{
    LCD = c;
    RS = 0;
    EN = 1;
    EN = 0;
}

void data(char d)
{
    LCD = d;
    RS = 1;
    EN = 1;
    EN = 0;
}

unsigned char adc_read()
{
    WR = 0;
    WR = 1;

    while(INTR);

    RD = 0;
    return ADC;
}

void main()
{
    unsigned char adc,temp;

    cmd(0x38);
    cmd(0x0C);
    cmd(0x01);

    while(1)
    {
        adc = adc_read();

        temp = (adc * 5 * 100) / 256;

        cmd(0x80);

        data((temp/10)+'0');
        data((temp%10)+'0');
        data(223);
        data('C');

        delay();
    }
}