Frequency changing of pwm pins of arduino uno

[kolaha]

How to set PWM frequency to 1 Hz on an UNO

I would like to set a pwm output on my UNO to run at a 1 Hz frequency and then, by analogWrite, set it at 10% or 90% dutycycle. Can that be done? If so, how do I do it? The background is my need to waist some current in a low power consuming project to keep the powering powerbank away from cutting off. In a test project using millis() the frequency of 1Hz and 10% dutycycle does the trick. Now I want to do the same in a sketch that hangs waiting for inputs go high and go low so millis() will pro…