#include <avr/io.h>
   #include <avr/delay.h>
   #define F_CPU 1000000UL  

void USART_Transmit (unsigned char data)
   {
     while ( !(UCSR0A & (1<<UDRE0)) )
      ;
     UDR0 = data;    
   }

void USART_Init (unsigned int baud)
   {
         UBRR0H = (unsigned char)(baud>>8);
     UBRR0L = (unsigned char)(baud);

     UCSR0B = (1<<RXEN0)|(1<<TXEN0);
     UCSR0C = (1<<UCSZ00)|(1<<UCSZ01);
   }


void Beep (unsigned int time)
   {
     PORTC = 0xff;
     _delay_ms(time);
     PORTC = 0x00;
     _delay_ms(time);
   }
  
int main(void)          
{
   DDRC = 0xff;
   PORTC = 0x00;
   USART_Init (51);
  
   while (1)    
   {  
     USART_Transmit ('1');
     Beep (100);
   }
}