#include <avr/io.h>
#include <util/delay.h>

#define BAUD 9600

int main() {
  ADMUX |= (1 << REFS0) | (1 << MUX0);  //ADC1 E 5V;
  ADCSRA |= (1 << ADEN) | (1 << ADPS2) | (1 << ADPS1);

  uint16_t baud_setting = (F_CPU / 8 / BAUD - 1) / 2;
  UCSR0B |= (1 << TXEN0);
  UBRR0H = baud_setting >> 8;
  UBRR0L = baud_setting;


  while (1) {
    ADCSRA |= (1 << ADSC);  //START
    while (ADCSRA & (1 << ADSC));
    uint16_t adc = ADCL | (ADCH << 8);
    unsigned char str[15];
    sprintf(str, "ADC: %d\n", adc);
    for(int i = 0; i<sizeof(str); i++)
{
  USART_Transmit(str[i]);
}
  _delay_ms(1000);
  }
  return 0;
}

void USART_Transmit(unsigned char data) {

  while (!(UCSR0A & (1 << UDRE0)))
    ;
  UDR0 = data;
}