#include <Servo.h>

Servo myservo;
int pos = 0;


void setup() {
 pinMode(45,OUTPUT);//OC5B
 pinMode(46,OUTPUT);//OC5A
 myservo.attach(46);
 setPwmFrequency(45,100);
}
 
void loop() {
  
  
  for (pos = 30; pos<= 60; pos ++) {
    myservo.write(pos);
    delay(24);
  }
  for (pos = 60; pos>=30; pos --) {
    myservo.write(pos);
    delay(24);
  }

}

void setPwmFrequency(int pin,int precision){
  if(pin == 11 || pin == 12 || pin == 13){                  //timer 1
    TCCR1A = _BV(COM1A0)|_BV(COM1B1)|_BV(WGM11)|_BV(WGM10);
    TCCR1B = _BV(WGM13)|_BV(WGM12)|_BV(CS11);
    OCR1A = precision;
  }else if(pin == 6 || pin == 7 || pin == 8){               //timer 4
    TCCR4A = _BV(COM4A0)|_BV(COM4B1)|_BV(WGM41)|_BV(WGM40);
    TCCR4B = _BV(WGM43)|_BV(WGM42)|_BV(CS41);
    OCR4A = precision;
  }else if(pin == 46 || pin == 45 || pin == 44){            //timer 5
    TCCR5A = _BV(COM5A0)|_BV(COM5B1)|_BV(WGM51)|_BV(WGM50);
    TCCR5B = _BV(WGM53)|_BV(WGM52)|_BV(CS51);
    OCR5A = precision;
  }
}