I have a variable PWM signal at 13.2 kHz. I want to control a servo with this signal, but the servo needs a much lower frequency, at most 80 Hz. My first idea was to use two binary counters, a NOT gate, and an AND gate. That should do the trick, but it's definitely not the best solution. It requires a lot of ICs with a lot of unused pins. Also, the servo is looking at a pulse about 1-2ms wide, not a full PWM, so only about 8% of the PWM range would be useful.
Using an RC filter, I can just convert the original signal to an analog voltage. Is there any way I can use this analog voltage to control a 555 to get the signal I need?
My only experience with the 555 is using a pot to adjust the duty cycle.