void setup() {
  // put your setup code here, to run once:
DDRH|=(1<<PH3);//setting output pin
DDRF&=~(1<<PF0);//setting input pin for potentiometer
TCCR4A |=(1<<WGM40)|(1<<WGM41); // Fast PWM
TCCR4A |=(1<<COM4A1);  // Non-inverting mode for PWM
TCCR4B |=(1<<CS41);  // Prescaler of 8 
}
void loop() {
  // put your main code here, to run repeatedly:
ADCSRB|=(1<<ACME);
ADMUX=1;//choosing A1 pin
ADCSRA|=(1<<ADSC);
while(ADCSRA&(1<<ADSC));
unsigned int value=ADC;
unsigned int mappedvalue=map(value,0,1023,0,255);
OCR4A=mappedvalue;
}