int main()
{

// LED
PORTB = 0b00010000; // PB4 - ONT
DDRB = 0b00010000; // PB4 - off (PS: active low)

// Button
PORTA = 0b00000000; // PA5 - IN
DDRA = 0b00000000; // PA5 - TriState


ACSR = 0b10000000; // Analog Comparator: Off
ADCSRA = 0b10000000; // Disable ADC 0x80;



while(1)
{
if (PORTA & 0x100000) PORTB &= ~0b00010000;

// для проверки
//PORTB &= ~0b00010000;

}




}

ACSR = 0b10000000; // Analog Comparator: Off
ADCSRA = 0b10000000; // Disable ADC 0x80;