#ifndef F_CPU
#define F_CPU 1000000UL // 16 MHz clock speed
#endif
#define D4 eS_PORTD4
#define D5 eS_PORTD5
#define D6 eS_PORTD6
#define D7 eS_PORTD7
#define RS eS_PORTC6
#define EN eS_PORTC7

#include <string.h>
#include <stdio.h>
#include <avr/io.h>
#include <util/delay.h>
#include "lcd.h" //Can be download from the bottom of this article

int main(void)
{
    DDRD = 0xFF;
    DDRC = 0xFF;
    int i;
    Lcd4_Init();
    int result_h;
    int result_l;
    unsigned char output_l;
    unsigned char output_h=0b00000000;

    DDRB = 0xFF;
    //Configure the ADC module of the ATmega16
    ADMUX = 0b00000011;         //REFS1:0 = 01    -> AVCC as reference
                                //ADLAR   =  0    -> Right adjust
                                //MUX4:0  = 00011 -> ADC3 as input

    ADCSRA = 0b10000100;

    while(1)
    {

        ADCSRA |= (1 << ADSC);
        while(ADCSRA & (1 << ADSC)){;}

        output_l = ADCL;
        result_l = ADCL;
        output_h = ADCH | output_h;
        result_h = output_h;

        result_h = (output_h << 8) | output_l;
        float voltage = (result_h )*4/1024;



        int c = voltage * 100;
        int b = c / 10;
        int a = b/10;



        a = a % 10;
        b = b % 10;
        c = c % 10;



        Lcd4_Set_Cursor(1,1);

        Lcd4_Write_Char(a + '0');
        Lcd4_Write_Char('.');
        Lcd4_Write_Char(b + '0');
        Lcd4_Write_Char(c + '0');

        PORTB = result_h;


    }

    return 0;
}