Electric brew kettle controller

Thanks Far-seeker
I think that is a bit to complicatet for my needs. What I need is a PWM signal on one pin with a 2 sec period and the abillity to change the duty cycle with a potmeter. I found this in the playground but dont know how to write the code for what I want.

/*
 *  Timer1 library example
 *  June 2008 | jesse dot tane at gmail dot com
 */
 
#include "TimerOne.h"
 
void setup()
{
  pinMode(10, OUTPUT);
  Timer1.initialize(500000);         // initialize timer1, and set a 1/2 second period
  Timer1.pwm(9, 512);                // setup pwm on pin 9, 50% duty cycle
  Timer1.attachInterrupt(callback);  // attaches callback() as a timer overflow interrupt
}
 
void callback()
{
  digitalWrite(10, digitalRead(10) ^ 1);
}
 
void loop()
{
  // your program here...
}

Can someone help me write the code for what I want to do?