void setup() {
 DDRA = (1 << PA7);  //OUTPUT LED on PA2
 DDRB &= ~(1 << PB2); //set PB3 as input

 PORTB != (1 << PB2); //activate pull-up resistor for PB3

}

void loop() {
 if (PINB & (1 << PB2)) // Redesign the Signal from PB2
 {
  PORTA = (1 << PA7); //LED is ON
  _delay_ms(10);
  PORTA & = `~(1<< PA7); //LED is OFF
    _delay_ms(10);
 }
else
{
  PORTA = (1 << PA7); // LED is ON
}
}