How to change ATTINY85 PWM Pin Frequency

[chrisknightley]

Yup.
It will output about 31.4kHz.
The duty cycle can be set from 0% to 100% by writing a value from 0 to 255 in OCR0A and OCR0B.

set OCR0A when change duty cycle of physical pin 5
set OCR0B when change duty cycle of physical pin 6