#include <avr/io.h>					
#include <avr/delay.h>					
					
int main(void)					
{					
	//PIN Belegung				
	//				
	//PB0		LED grün		
	//PB1		LED rot		
	//PB2		LED blau		
	//PB3		Speaker		
	//PB4		Taster		
					
	DDRB = 0b00001111;				
	PORTB = 0b00010000;				
					
	int i;				
	int alarmOnOff;				
	int count;				
					
	while (1)				
	{				
		while (!(PINB & 0b00010000))			
		{			
			count++;		
		}			
					
		if (count >> 200)			
		{			
			if(alarmOnOff == 1) alarmOnOff = 0; else alarmOnOff=1;		
			count = 0;		
		}			
					
		if (alarmOnOff == 1)			
		{			
			PORTB = 0b00000001;		
					
			for(i=1;i<100;i++)		
			{		
				_delay_ms(2);	
				PORTB = PORTB ^ (1<<PB3);	
			}		
					
			PORTB = 0b00000010;		
					
			for(i=1;i<100;i++)		
			{		
				_delay_ms(3);	
				PORTB = PORTB ^ (1<<PB3);	
			}		
					
			PORTB = 0b00000100;		
					
			for(i=1;i<100;i++)		
			{		
				_delay_ms(2);	
				PORTB = PORTB ^ (1<<PB3);	
			}		
		}			
		else			
		{			
			PORTB = 0b00000000;		
		}			
	}				
}