#define F_CPU 16000000UL
#define BAUD 9600
#include <avr/io.h>
#include <util/delay.h>
#define myubrr F_CPU/16/BAUD-1




void ADC_config(void)
{
	ADMUX = (0<<REFS1)|(1<<REFS0); // set Vref = 5V//
	ADCSRA = (1<<ADPS0)|(1<<ADPS1)|(1<<ADPS2)|(1<<ADEN); //Prescaler 128 and Conversion enable//	
}
unsigned short get_ADCvalue()
{
	unsigned short Wert;
	ADMUX &=0xF0; //clear unwanted bits with 0//
	ADMUX |=(1<<0);
	ADCSRA |= (1<<ADSC);
	while((ADCSRA&(1<<ADSC)));
	Wert = ADC;
  	return Wert;
   
}

void USART_Init( unsigned int ubrr) 
{
  	UBRR0H = 0;
	UBRR0L = (unsigned char)ubrr;
	UCSR0B = (1<<TXEN0);
	UCSR0C = (3<<UCSZ00);
	}
void Send_ASCII( unsigned char data )//UASRT Transmit//
{
	while ( !( UCSR0A & (1<<UDRE0)));
	UDR0 = data;
}	 

int main(void)
{
	ADC_config();
	USART_Init(myubrr);
  	unsigned char digit;
	unsigned char AnalogWert;
	unsigned char WertASCII[5];
	/*WertASCII[1]='.';
	WertASCII[4]='V';
	WertASCII[5]='\n';*/
  
  
while(1)
    {
		int digit = get_ADCvalue();
		AnalogWert = (digit*500)/1023;
		
		WertASCII[4]= ' ';
		WertASCII[3]= 'V';
  
		WertASCII[2]= (AnalogWert%10)+48;
		AnalogWert = AnalogWert/10;
  
		WertASCII[1]= (AnalogWert%10)+48;
		AnalogWert = AnalogWert/10;
  
		WertASCII[0] = AnalogWert+48;
  		
  		Send_ASCII(WertASCII[0]);
  		Send_ASCII(WertASCII[1]);
  		Send_ASCII(WertASCII[2]);
  		Send_ASCII(WertASCII[3]);
  		Send_ASCII(WertASCII[4]);
  
		/*for(int i = 0;i<=4;i++)
		{
			Send_ASCII(WertASCII[i]);
		}*/
		_delay_ms(1000);
    }
}