int main (void)
{
    int adc_in;

DDRB |= (1<<PB1);
    // LED is an output.
    DDRB |= (1 << LED);
    DDRB |= (1<<PB0);
    adc_setup();
    pwm_setup();
    PB1 == 0;

  while (1) {
        if(!(PINB&(1<<PB0)))
        {

            if(!(PINB&(1<<PB0)))
            {
               PB1==0 ;
                _delay_ms(20);
                // Get the ADC value
                adc_in = adc_read();
                // Now write it to the PWM counter
                pwm_write(adc_in);
                _delay_ms(50);
            }
        }
    }

}