A few months ago, [Julian Ilett] found a problem using the Arduino library for PWM. Recently, he revisited the issue and used his own PWM code to fix the ... analogWrite(pin, 256-val) else ...

For the “common” PWM, if we write a value from 0 to 255 on a PWM pin, the Arduino library will drive the assigned pin to output a PWM signal whose on time is in proportion to the written value.

PWM pins work the same way across all Arduino boards, so you don't need to go out of your way to buy a Mega if you already have a board supporting PWM. On the Uno, Nano, and Mini, the PWM pins are ...

Output Up To 768 PWM Signals From One Arduino. 46 Comments . by: Mike Szczys. July 20 ... This is thanks to his well-optimized code that manages to drive the clock pin of the registers at 1.33 ...