PWM.h

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i've modified original pwm.h sam knight in order conform more "install friendly" (library.properties, examples in own folders, etc).  i've added additional example have helped me when utilizing library more resolution led driver. note made no functional code changes.

the library:
https://github.com/terryjmyers/pwm.git




original forum post:
https://forum.arduino.cc/index.php?topic=117425.0

original repository:
https://code.google.com/archive/p/arduino-pwm-frequency-library/downloads

what's chance port work on attiny45/85?


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