/diy/ - Do It Yourself

I'm making a temperature controller for my heating mantle (basically just a hot plate) and was wondering if it's possible to lower the PWM frequency, I would like 50% on the potentiometer to be 0.5 sec off 0.5 sec on, 25% to be 0.25 sec on 0.75sec off, 100% to be solid on.
The arduino is controlling a solid state relay on pin 9 and the potentiometer is hooked to pin 0.
AnalogInOutSerial example in the IDE seems to be exactly what I need other than the fact that it switches too quickly.

Is there a way to lower the frequency at which the PWM switches on and off, a much coarser duty cycle than the stock one, like 1hz, vs the 490hz of the stock PWM.